CN112031750B - Device and method for testing radial expansion pressure of static crushing agent in drill hole - Google Patents
Device and method for testing radial expansion pressure of static crushing agent in drill hole Download PDFInfo
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- CN112031750B CN112031750B CN202010914166.XA CN202010914166A CN112031750B CN 112031750 B CN112031750 B CN 112031750B CN 202010914166 A CN202010914166 A CN 202010914166A CN 112031750 B CN112031750 B CN 112031750B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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Abstract
一种钻孔内静态破碎剂径向膨胀压测试装置及方法，装置由置于刚性基座上的压力传感器、置于压力传感器顶面的径向膨胀压测试模拟管、模拟管轴向和径向约束机构和压力传感器数据采集仪组成；测试方法是：利用数值模拟技术以径向膨胀压测试模拟管为计算模型建立径向膨胀压测试模拟管内破碎剂膨胀压Pi与模拟管外壁所受压力Fo的关系曲线；通过压力传感器及压力传感器数据采集仪对装有破碎剂、置于压力传感器顶面的模拟管在轴向和径向约束状态下测试和采集压力Fo，利用Fo与Pi关系曲线得模拟管内破碎剂径向膨胀压Pi随破碎剂水化反应时间的变化曲线，通过该曲线得到钻孔内破碎剂在不同水化时间的径向膨胀压。
A device and method for radial expansion pressure testing of static crushing agent in a borehole. It is composed of a directional restraint mechanism and a pressure sensor data acquisition instrument; the test method is: using the numerical simulation technology to use the radial expansion pressure test simulation pipe as the calculation model to establish the radial expansion pressure test simulation pipe crushing agent expansion pressure Pi and the simulated pipe outer wall The relationship curve of the pressure F o ; the pressure F o is tested and collected by the pressure sensor and the pressure sensor data acquisition instrument on the simulated tube with the crushing agent and placed on the top surface of the pressure sensor in the axial and radial constraints state, using the F o The relationship curve with Pi can simulate the change curve of the radial expansion pressure Pi of the crushing agent in the pipe with the hydration reaction time of the crushing agent, and the radial expansion pressure of the crushing agent in the borehole at different hydration times can be obtained from this curve.
Description
Technical Field
The invention relates to the field of geotechnical engineering, in particular to a device and a method for testing radial expansion pressure of a static crushing agent in a drill hole.
Background
Along with the enhancement of the environmental awareness and the requirements of energy conservation and consumption reduction of people, the tolerance degree of people to vibration, waste rocks, toxic and harmful gases and the like generated by explosive chemical blasting is lower and lower. The static crushing agent has the characteristics of slow expansion and cracking, no noise, no vibration and no harmful gas generation, and is widely applied to the engineering fields of stone mining, building demolition, concrete crushing, rock excavation, deep stress regulation, high slope finishing and the like.
The technical indexes for measuring the performance of the static crushing agent are many, wherein the expansion pressure is the most important, and the accuracy of measurement is of great significance to performance evaluation of the static crushing agent, parameter selection in industrial application and cost control.
At present, the testing methods related to the expansion pressure of the static crushing agent mainly comprise an outer pipe method, an inner pipe method and a pressure sensor method. The three methods are all that the strain value of the surface of the measured object is measured by using a resistance strain gauge, and the expansion pressure generated by the expanding agent is calculated by using a certain corresponding relation. Because the hydration reaction process of the expanding agent is an exothermic reaction, the temperature generated by the expanding agent has a large influence on the measurement of the resistance strain gauge, and the error is often generated when the resistance strain gauge is used for measuring the expansion pressure. For this reason, there are studies to eliminate the thermal effect by using a temperature compensation sheet or a method of sealing the strain gauge with a sealant instead of a plastic bag, but these methods do not fundamentally eliminate the influence of the strain gauge.
In view of the above problems, the CN108151937A patent document discloses a testing device and method for static crushing agent expansion pressure, which reversely calculates the radial expansion pressure generated by the expansion agent by measuring the deformation on the measuring rod between two limiting plates; the patent document CN109900409A discloses a method for testing radial expansion pressure of static cracking agent, which comprises the steps of measuring radial strain and tangential strain by sticking a strain gauge on the table top of a metal cylinder and calculating the radial expansion pressure of the static cracking agent by substituting the measured radial strain and tangential strain into a formula. Although the two methods can measure the radial expansion pressure, the problems of complex bonding process of the strain gauge, high cost caused by the fact that the strain gauge cannot be reused and the like exist.
CN109883591A patent discloses a static crushing agent expansion pressure measuring device and method, which utilizes a peripheral block and a top and bottom baffle plate to form a closed chamber, fills the closed chamber with a crushing agent, and calculates the radial expansion pressure of the static crushing agent by dividing the dynamometer indication between the peripheral block and a fixed block by the sectional area of the closed chamber. The method can measure the radial expansion pressure, does not need to stick a strain gauge, but only can be used for measuring the expansion pressure of the slurry-like static crushing agent, is not suitable for the roll-like static crushing agent, has difference along with the change of the depth of the expansion pressure, and has errors when the expansion pressure generated by replacing the static crushing agent in the whole device with the expansion pressure with a certain height.
Based on the above problems, the CN1441233A patent discloses a method and a device for testing the expansion pressure of a static cracking agent, which laterally constrain the static cracking agent through a steel die, so that the static cracking agent can only generate axial expansion and displacement, and then convert the reading of a force measuring ring into pressure through a linear relationship, and divide the pressure by an action area to calculate the expansion pressure; the patent document CN103323164A discloses a test system for measuring the expansion pressure of a static crushing agent, which measures the expansion pressure by loading a pressure sensor and a movable piston on a rigid frame of a pressure tester, pushes the piston after the hydration reaction of the static crushing agent, links a pressure box, and then the pressure sensor records the pressure value, and further back calculates the expansion pressure of the static crushing agent; the CN108444550A patent document discloses an integrated device for testing expansion pressure and temperature of a static breaker, which reads the axial expansion pressure during the hydration reaction of the static breaker based on a pressure box by utilizing the movement of an upper sealing piston in a constraint frame. The static cracking agent expansion pressure testing device and method disclosed in these patent documents can avoid the complicated process of sticking the resistance strain gauge and the influence of thermal effect on the test result, but the expansion pressures tested are axial expansion pressures. In fact, because the axial-to-radial ratio of the drill holes is different, the expansion pressure of the static crushing agent in the axial direction is different from that in the radial direction, the radial expansion pressure of the static crushing agent plays a main role in a production field, and the radial expansion pressure of the static crushing agent is taken as the axial expansion pressure, so that the radial expansion pressure has larger deviation; and the problems of complicated test process, high test cost, low test result precision and the like exist.
In summary, the expansion pressure testing method of the existing static crushing agent has the technical problems of complicated testing process, high testing cost, low precision of testing results, simple testing of axial expansion pressure, testing of expansion pressure generated by the slurry-like static crushing agent and the like in different degrees, so that the application of the method in actual production is greatly limited.
Disclosure of Invention
In order to solve the technical problems of the existing static crushing agent expansion pressure testing method, the invention provides a device and a method for testing the radial expansion pressure of a static crushing agent in a drill hole.
The invention provides a radial expansion pressure testing device for a static crushing agent in a drill hole, which comprises: the device comprises a rigid frame, a rigid base, a pressure sensor, a radial expansion pressure test simulation pipe, an axial constraint mechanism, a radial constraint mechanism and a pressure sensor data acquisition instrument;
the rigid frame is made of high-strength rigid materials and comprises a base positioned at the bottom, a lower platform positioned in the middle and an upper platform positioned at the upper part;
the rigid base is arranged on the upper part of the lower platform of the rigid frame;
the pressure sensor is a spoke type pressure sensor and is arranged on the upper part of the rigid base;
the radial expansion pressure test simulation pipe is a metal round pipe with two ends capable of being sealed, the inner diameter of the metal round pipe is the same as the aperture of the drilled hole (the drilled holes with different apertures are matched with the radial expansion pressure test simulation pipe with different inner diameters), the length is 100-300mm, and the thickness is 10-100 mm; the radial expansion pressure test simulation pipe is arranged on the top surface of the pressure sensor and is aligned with the center of the top surface of the pressure sensor;
the axial restraint mechanism consists of a central axis corresponding to the radial expansion pressure test simulation pipe, an axial lead screw which can advance and retreat through a threaded hole on the left side of the rigid frame, an axial lead screw handle arranged at the outer end of the axial lead screw, an axial restraint steel plate welded with the inner end of the axial lead screw into a whole, and a top column which corresponds to the right end center of the radial expansion pressure test simulation pipe and is welded on the right side of the rigid frame; in the test process, the two ends of the radial expansion pressure test simulation pipe are clamped between the axial constraint steel plate and the top column through the rotary axial lead screw handle, and the axial displacement of the radial expansion pressure test simulation pipe is constrained;
the radial constraint mechanism consists of a central axis corresponding to the radial expansion pressure test simulation pipe, a radial screw rod which can advance and retreat through a threaded hole on an upper platform of the rigid frame, a radial screw rod handle arranged at the upper end of the radial screw rod and a radial constraint steel plate which is welded with the lower end of the radial screw rod into a whole; in the test process, the radial expansion pressure test simulation pipe is clamped between the radial constraint steel plate and the pressure sensor by rotating the radial lead screw handle, and the radial displacement of the radial expansion pressure test simulation pipe is constrained;
the pressure sensor data acquisition instrument is connected with the pressure sensor through a lead, acquires and records real-time data of monitoring pressure signals of the pressure sensor, and converts the acquired data and the expansion pressure of the static crushing agent in real time through built-in software.
Further, the radial expansion pressure test simulation pipe can be made into a split structure: the test simulation pipe is characterized by comprising two semicircular pipe pieces which are axially divided into two symmetrical parts in equal, the two semicircular pipe pieces are embedded into each other through a dovetail groove and a dovetail protrusion to form a radial expansion pressure test simulation pipe, and the two ends of the test simulation pipe are plugged by a circular sealing cover arranged at one end of each of the two semicircular pipe pieces to form the whole radial expansion pressure test simulation pipe. The radial expansion pressure test simulation pipe adopts the split structure, so that after the test is finished, the expansion agent solidified after expansion is taken out by disassembling the radial expansion pressure test simulation pipe, and the radial expansion pressure test simulation pipe can be repeatedly used.
The method for testing the radial expansion pressure of the static crushing agent in the drill hole by using the device for testing the radial expansion pressure of the static crushing agent in the drill hole comprises the following steps:
step 1: the method for establishing the expansion pressure P generated by the static crushing agent in the radial expansion pressure test simulation pipeiRadial expansion pressure test simulation pipe outer wall pressure FoThe relationship between:
under the condition that the elastic modulus E and the Poisson ratio u of the parameters of the simulated tube material in the radial expansion pressure test are known, the numerical simulation software is utilized to take the simulated tube in the radial expansion pressure test as a calculation model, and the circumferential uniform stress P is applied to the inner wall of the calculation modeliTo simulate silenceRadial expansion pressure generated by the state crushing agent; applying normal displacement constraint to a contact area between the outer wall of the calculation model and the upper end face of the pressure sensor so as to simulate the mutual extrusion action between the pressure sensor and the radial expansion pressure test simulation tube; monitoring points are arranged in the constraint area at certain intervals and calculation is started, and after the calculation is finished, the pressure F borne by the outer wall of the calculation model is calculated by multiplying the average stress value of the monitoring points by the area of the micro-stress equivalent area existing in the outer wall surface of the calculation modeloThe pressure measured by the pressure sensor is simulated (the radial expansion pressure tests the pressure borne by the outer wall of the simulation pipe); then the pressure F measured by the pressure sensor is obtained through calculation softwareoAnd PiThe expansion pressure P generated by static crushing agent in the simulation pipe in the radial expansion pressure test is obtained according to the corresponding relation between the twoiRadial expansion pressure test simulation pipe outer wall pressure FoThe relationship between them;
step 2: simulation of static crushing agent in pipe in radial expansion pressure test
Filling a slurry-like static crushing agent (namely the static crushing agent after water is added) into a radial expansion pressure test simulation pipe (the radial expansion pressure test simulation pipe at the moment is an integral metal pipe); or the pasty static crushing agent is filled into a flexible sealing bag and then is placed into a radial expansion pressure test simulation tube; or soaking a static crushing agent cartridge with the same inner diameter as the radial expansion pressure test simulation pipe in water and then putting the immersed static crushing agent cartridge into the radial expansion pressure test simulation pipe;
and step 3: installation radial expansion pressure test simulation pipe
Aligning a radial expansion pressure test simulation pipe filled with a static crushing agent with the center of the top surface of a pressure sensor placed on a rigid base and placing the pipe on the top surface of the pressure sensor, so that the right end surface of the radial expansion pressure test simulation pipe is abutted against a top column welded on the right side of a rigid frame; manually rotating the axial lead screw handle to enable the axial restraining steel plate to tightly push against the left end face of the radial expansion pressure test simulation tube, clamping two ends of the radial expansion pressure test simulation tube between the axial restraining steel plate and the ejection column, and restraining axial displacement of the radial expansion pressure test simulation tube; manually rotating the radial lead screw handle to enable the radial constraint steel plate to tightly push against the outer wall of the upper part of the radial expansion pressure test simulation pipe, clamping the radial expansion pressure test simulation pipe between the radial constraint steel plate and the pressure sensor, and constraining the radial displacement of the radial expansion pressure test simulation pipe;
and 4, step 4: with the expansion of the static crushing agent, testing the radial expansion pressure through a pressure sensor to simulate the stress F 'of the outer wall of the pipe'oPressure F 'measured by pressure sensor is collected through pressure sensor data collector'oAnd recording; simulating expansion pressure P generated by static crushing agent in pipe by using expansion pressure test obtained in step 1iRadial expansion pressure test simulation pipe outer wall pressure FoThe relation curve between the two can obtain the radial expansion pressure P 'of the static crushing agent in the simulated pipe of the radial expansion pressure test'iAnd (3) along with the variation curve of the hydration reaction time (h) of the static crushing agent, obtaining the radial expansion pressure of the static crushing agent in the drill hole generated in different hydration reaction times through the curve.
The invention has the following beneficial results:
1. the invention adopts the radial expansion pressure test established by the numerical simulation technology to simulate the radial expansion pressure P generated by the static crushing agent in the pipeiRadial expansion pressure test simulation pipe outer wall pressure FoThe relationship between the radial expansion pressure P of the static crushing agent and the radial expansion pressure P of the static crushing agent measured by the outer tube method approved in the prior artiPressure F against the outer wall of the tubeoThe comparison of the relation curves proves that the radial expansion pressure P generated by the static crushing agent in the simulated pipe is simulated by the radial expansion pressure test established by the inventioniRadial expansion pressure test simulation pipe outer wall pressure FoThe relation curve between the two is accurate and reliable as a test standard.
2. According to the invention, the pressure F 'borne by the outer wall of the pipe is simulated through testing the radial expansion pressure'oAnd simulating the radial expansion pressure P generated by the static crushing agent in the pipe by utilizing the established radial expansion pressure testiRadial expansion pressure test simulation pipe outer wall pressure FoThe relation curve between the two can obtain the expansion pressure P 'generated by the static crushing agent in the simulation pipe of the radial expansion pressure test'iTest methodSimple and accurate test result.
3. The invention can effectively avoid the complicated process of pasting the strain gauge in the prior art and the influence of high temperature generated by hydration reaction of the static breaking agent on the test result.
4. The invention overcomes the deviation of the prior expansion pressure measuring method which uses the axial expansion pressure of the static crushing agent as the radial expansion pressure of the static crushing agent required by the production field.
5. Aiming at the drill holes with different apertures, the invention can simulate the test of the radial expansion pressure of the static crushing agent in the drill holes with different apertures by replacing the radial expansion pressure test simulation pipes with different inner diameters and the numerical simulation calculation model.
6. The invention is suitable for both slurry-like static crushing agents and roll-like static crushing agents.
Drawings
FIG. 1 is a schematic structural diagram of a testing apparatus according to the present invention;
FIG. 2 is a schematic view of a rigid frame in the test apparatus;
FIG. 3 is a schematic view of a radial expansion pressure test simulation tube (symmetrical halves) in a split configuration in a test apparatus;
FIG. 4 is a three-dimensional schematic view of an axial restraint mechanism in the test apparatus (dummy tube);
FIG. 5 is a three-dimensional schematic view of a radial restraint mechanism (dummy tube) in the test apparatus;
FIG. 6 is a view showing an example of a borehole having an aperture of 50mm, in which radial expansion pressure P generated by a static breaker in a simulated tube is measured by a radial expansion pressure test obtained by a numerical simulation technique in the course of measuring the radial expansion pressure generated by the static breaker in the borehole according to the present inventioniRadial expansion pressure test simulation pipe outer wall pressure FoThe relationship between them;
FIG. 7 is a radial expansion pressure variation curve of the expansion agent in the simulated pipe along with the variation of the hydration reaction time (h) measured by the device of the present invention and the curve of FIG. 6.
The symbols in the drawings illustrate that: 1. the device comprises a rigid frame, 1-1 parts of a base, 1-2 parts of a lower platform, 1-3 parts of an upper platform, 2 parts of a rigid base, 3 parts of a pressure sensor, 4 parts of a radial expansion pressure test simulation pipe, 4-1 parts of a dovetail groove, 4-2 parts of a dovetail protrusion, 4-3 parts of a sealing cover, 5 parts of a (simulation pipe) axial constraint mechanism, 5-1 parts of an axial lead screw, 5-2 parts of an axial lead screw handle, 5-3 parts of an axial constraint steel plate, 5-4 parts of a top column, 6 parts of a (simulation pipe) radial constraint mechanism, 6-1 parts of a radial lead screw, 6-2 parts of a radial lead screw handle, 6-3 parts of a radial constraint steel plate, 7 parts of a pressure sensor data acquisition instrument, 8 parts of a static crushing agent.
Detailed Description
The invention is further illustrated by the following figures and examples.
In the following examples, static crushing agents are used for blasting 50mm drilled holes in a certain mine, and the radial expansion pressure generated by the static crushing agents in the drilled holes is tested by adopting the device and the method provided by the invention.
Example 1
As shown in fig. 1, the testing device used in this embodiment includes a rigid frame 1, a rigid base 2, a pressure sensor 3, a radial expansion pressure test simulation tube 4, an axial constraint mechanism 5, a radial constraint mechanism 6, and a pressure sensor data acquisition instrument 7.
As shown in fig. 2, the rigid frame 1 is made of high strength alloy steel and includes a base 1-1 at the bottom, a lower platform 1-2 at the middle, and an upper platform 1-3 at the upper.
As shown in fig. 1, the rigid base 2 is placed on the upper portion of the lower platform. The pressure sensor 3 is a spoke type pressure sensor, the inner diameter of the top surface of the pressure sensor is 30mm, the outer diameter of the pressure sensor is 40mm, and the pressure sensor is arranged on the upper portion of the rigid base.
The radial expansion pressure test simulation pipe 4 is made of alloy steel and is of a split structure (the radial expansion pressure test simulation pipe is of the split structure, so that after the test is finished, a condensate expanded by a static crushing agent is taken out by disassembling the radial expansion pressure test simulation pipe, the radial expansion pressure test simulation pipe can be reused), the radial expansion pressure test simulation pipe is composed of two mutually symmetrical semicircular pipe pieces (only one semicircular pipe piece is shown in figure 3) which are axially divided into two, the two semicircular pipe pieces are mutually embedded through a dovetail groove 4-1 and a dovetail projection 4-2 to form a radial expansion pressure test simulation pipe barrel, two ends of the radial expansion pressure test simulation pipe barrel are blocked by a circular sealing cover 4-3 arranged at one end of each of the two semicircular pipe pieces, the inner diameter of the radial expansion pressure test simulation pipe barrel is 50mm (the same as the bore diameter of a drill hole), and the length of the radial expansion pressure test simulation pipe is 150mm, the radial expansion pressure test of 10mm thickness simulates the whole pipe. The radial expansion pressure test simulates the elastic modulus E of the alloy steel material of the pipe, which is 300GPa, and the Poisson ratio u, which is 0.37. After the radial expansion pressure test simulation tube assembled into a whole is filled with the static crushing agent 8, the radial expansion pressure test simulation tube is placed on the top surface of the pressure sensor and is aligned with the center of the top surface of the pressure sensor as shown in fig. 1.
As shown in fig. 1 and 4, the axial restraint mechanism 5 is composed of an axial lead screw 5-1 which is corresponding to the central axis of the expansion pressure test simulation tube and can advance and retreat through a threaded hole (not shown) on the left side of the rigid frame, an axial lead screw handle 5-2 which is installed at the outer end of the axial lead screw, an axial restraint steel plate 5-3 which is welded with the inner end of the axial lead screw into a whole, and a support pillar 5-4 which is corresponding to the center of the right end of the expansion pressure test simulation tube and is welded on the right side of the rigid frame; in the testing process, the two ends of the axial expansion pressure testing simulation pipe are clamped between the axial constraint steel plate and the top column through the rotating axial lead screw handle, and the axial displacement of the radial expansion pressure testing simulation pipe is constrained.
As shown in fig. 1 and 5, the radial constraint mechanism 6 is composed of a radial lead screw 6-1 corresponding to the axial center of the expansion pressure test simulation tube and capable of advancing and retreating through a threaded hole (not shown) on an upper platform of the rigid frame, a radial lead screw handle 6-2 installed at the upper end of the radial lead screw, and a radial constraint steel plate 6-3 welded with the lower end of the radial lead screw into a whole; in the test process, the radial expansion pressure test simulation pipe is clamped between the radial constraint steel plate and the pressure sensor by rotating the radial lead screw handle, and the radial displacement of the radial expansion pressure test simulation pipe is constrained;
as shown in fig. 1, the pressure sensor data acquisition instrument 7 is connected with the pressure sensor 3 through a wire, and is used for acquiring and recording the monitoring pressure signal of the pressure sensor in real time, and converting the acquired data and the expansion pressure of the static crushing agent in real time through built-in software.
The method for testing the radial expansion pressure of the static crushing agent in the drill hole by using the testing device comprises the following steps:
step 1: the method for establishing the expansion pressure P generated by the static crushing agent in the radial expansion pressure test simulation pipeiRadial expansion pressure test simulation pipe outer wall pressure FoThe relationship between:
under the condition that the elastic modulus E of the alloy steel material of the radial expansion pressure test simulation pipe is 300GPa and the Poisson ratio u is 0.37, a numerical simulation software FLAC-3D is utilized to establish a radial expansion pressure test simulation pipe calculation model with the inner diameter of 50mm (the grid is divided into hexahedral units with the length less than or equal to 1 mm), and the annular uniformly distributed stress P of 200MPa, 400MPa and 60MPa is respectively applied to the inside of the calculation modeliAnd applying normal displacement constraint in a contact area (an area 15mm away from the two sides of the axial center of the outer wall of the calculation model and 5mm in length) between the outer wall of the calculation model and the top surface of the pressure sensor to simulate the mutual extrusion action between the pressure sensor and a radial expansion pressure test simulation tube, arranging monitoring points at intervals of 1mm in the constraint area, wherein the total number of the monitoring points is 12, starting operation, and multiplying the stress average value of the 12 monitoring points by the equivalent area of the micro stress existing on the outer wall surface of the calculation model, namely the area of the equivalent area of 20mm2The pressure F borne by the outer wall surface of the calculation model can be calculatedoThe pressure measured by the pressure sensor is simulated (the radial expansion pressure tests the pressure borne by the outer wall of the simulation pipe); then, the expansion pressure P generated by the static crushing agent in the simulated pipe in the radial expansion pressure test shown in FIG. 6 is obtained by utilizing the Origin softwareiRadial expansion pressure test simulation pipe outer wall pressure FoThe relationship between them.
And step 3: simulation of static crushing agent in pipe in radial expansion pressure test
Mix water and static breaker according to 25% water-cement ratio, with the intensive mixing of glass stick, pour into diameter 50mm with the slurry of funnel with the stirring, length 150 mm's flexible seal bag in, need constantly stir at this in-process, with the removal of contained gas, stop the slip casting after filling the seal bag, and seal, later put into split type radial expansion pressure test simulation pipe's a semicircle pipe piece with the flexible seal bag that will seal, with it through dovetail and protruding mutual scarf joint of dovetail constitute both ends confined radial expansion pressure test simulation pipe wholly, the flexible seal bag parcel that will be equipped with static breaker is in radial expansion pressure test simulation pipe.
And 4, step 4: installation radial expansion pressure test simulation pipe
Aligning the radial expansion pressure test simulation tube filled with the static crushing agent in the step 3 with the center of the top surface of the spoke type pressure sensor placed on the rigid base and placing the radial expansion pressure test simulation tube on the top surface of the pressure sensor, so that the right end surface of the radial expansion pressure test simulation tube is abutted against a top column welded on the right side of the rigid frame; manually rotating the axial lead screw handle to enable the axial restraining steel plate to tightly push against the left end face of the radial expansion pressure test simulation tube, clamping two ends of the radial expansion pressure test simulation tube between the axial restraining steel plate and the ejection column, and restraining axial displacement of the radial expansion pressure test simulation tube; and manually rotating the radial lead screw handle to enable the radial constraint steel plate to tightly push against the outer wall of the upper part of the radial expansion pressure test simulation pipe, clamping the radial expansion pressure test simulation pipe between the radial constraint steel plate and the pressure sensor, and constraining the radial displacement of the radial expansion pressure test simulation pipe.
And 5: with the expansion of the static crushing agent, monitoring radial expansion pressure through a pressure sensor to test the stress F 'on the outer wall of the simulation pipe'oAcquiring pressure F 'measured by a pressure sensor through a pressure sensor data acquisition instrument'oAnd (3) recording data, and simulating the expansion pressure P generated by the static crushing agent in the pipe by using the radial expansion pressure test obtained in the step (1)iRadial expansion pressure test simulation pipe outer wall pressure FoThe relation curve between the two can obtain the radial expansion pressure P 'of the static crushing agent in the simulation pipe of the radial expansion pressure test shown in figure 7'iThe time (h) is changed into a curve, and the radial expansion pressure generated by the static crushing agent in the drill hole in different hydration reaction time can be obtained through the curve.
Example 2
The test apparatus used in this example was the same as that used in example 1. Step 3 of the radial expansion pressure test method is only to fill the static crushing agent in the radial expansion pressure test simulation tube, namely, a static crushing agent cartridge with the diameter of 50mm and the length of 150mm is soaked in water for 8min and then is placed on one semicircular tube piece of the split type radial expansion pressure test simulation tube, the other semicircular tube piece is embedded with the other semicircular tube piece through a dovetail groove and a dovetail protrusion to form a radial expansion pressure test simulation tube whole with two closed ends, and the static crushing agent cartridge is wrapped in the radial expansion pressure test simulation tube. The rest of the test method was the same as that of example 1.
Example 3
The difference between the testing device used in this example and the testing device used in example 1 is that the split type radial expansion pressure test simulation tube is replaced by an integral type radial expansion pressure test simulation tube (not shown) with a bottom cover at one end and a threaded connection sealing cover at the other end, and the rest of the structure is the same.
The method for testing the radial expansion pressure of the static crushing agent in the drill hole by using the testing device of the embodiment is different from the testing method of the embodiment 1 in that when the static crushing agent is filled in the radial expansion pressure testing simulation pipe in the step 3, water and the static crushing agent are mixed according to the water cement ratio of 25 percent, after the mixture is fully and uniformly stirred by a glass rod, slurry is directly filled into the radial expansion pressure testing simulation pipe by using a funnel, and then a sealing cover is screwed on. The rest of the test method was the same as that of example 1.
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