CN108444889A - Become pressure adjustable rock cranny testing permeability device - Google Patents

Abstract

The invention belongs to the technical field of rock mass permeability measurement, and discloses a variable pressure adjustable rock mass fissure permeability test device, including a plugging device, a converter, a connecting pipe, a drilling rig, a drill pipe and a control console. The converter is threadedly connected to the tail of the front occluder, which contains an inner ring, a spring and a cross wire sleeve. The compression degree of the spring can be changed by adjusting the cross wire sleeve, thereby controlling the opening pressure of the inner ring; the front occluder, the tail After the occluder swells, it forms a water injection cavity with the borehole, and the external high-pressure water enters the water injection cavity through the converter to detect the permeability of the borehole fracture. The test device simplifies the external operating system and operation steps, reduces the pipe in the borehole to one, avoids the problem of drill pipe winding, improves the stability of the measurement process, and realizes the plugging process and the measurement process in the same water source. Working under their respective pressures, the variable pressure adjustment of the converter is realized to adapt to different working environments and opening pressure requirements.

Description

Variable pressure adjustable rock mass fracture permeability testing device

technical field

The invention belongs to the technical field of rock mass permeability measurement, in particular to a variable pressure adjustable rock mass fissure permeability testing device.

Background technique

The permeability coefficient of rock mass is an important parameter reflecting the permeability of fractured rock mass, and the change of rock mass permeability is closely related to the damage of rock mass. Therefore, it is of great significance to study the relationship between rock mass permeability coefficient and fracture size, water injection volume and water injection pressure. At present, the commonly used equipment for the detection of borehole permeability is a double-end plugging leak detection device, which has the advantages of relatively high measurement accuracy and convenient manufacture. , leading to the problem that the pipelines in the corresponding borehole are prone to intertwining during the advancing process, resulting in unstable working process, troublesome operation process, poor adaptability and other problems.

Contents of the invention

The object of the present invention is to provide a pressure-variable and adjustable rock mass fissure permeability testing device.

Technical scheme of the present invention:

A pressure-variable and adjustable rock mass fracture permeability testing device, including a plugging device, a converter 6, a connecting pipe 25, a drilling rig 11, a drill pipe 9 and a control console 32; the plugging device further includes a front plug Blocker 30 and tail blocker 31;

The converter 6 is threadedly connected to the tail of the front occluder 30, and its interior includes an inner ring 34, a spring 22 and a cross wire sleeve 29. By adjusting the position of the cross wire sleeve 29, the compression degree of the spring 22 is changed, thereby controlling The opening pressure of the inner ring 34; the external water source is injected into the plugging cavity 27 through the leakage hole 33 in the leaking pipe 3 to inflate the rubber bag 5, and after the front occluder 30 and the tail occluder 31 are inflated, they are connected to the drill hole 28 A water injection cavity 26 is formed, and the external high-pressure water enters the water injection cavity 26 through the converter 6 to detect the crack permeability of the borehole 28;

The drilling rig 11 is connected with the test probe through the drill rod 9, and is used to lengthen and advance the test probe to a designated area. The drill rod 9 is a hollow rod, and the inside of the drill rod 9 can transport external high-pressure water sources. Between the drill rod 9 and the test probe Threaded connection, detachable;

The control console 32 is connected to the drill pipe 9 through a high-pressure hose 10, and includes a water discharge switch 12, a flow meter 13, a mechanical pressure gauge 14, a master control switch 15 and an electronic pressure gauge 16. The control console 32 is responsible for providing a predetermined pressure Water source, pressure relief and release of water, and detection and recording of parameters such as pressure and flow;

The front part occluder 30 includes a joint one 2, a leaking pipe 3, a joint two 4 and a rubber bag 5, the joint one 2 and the joint two 4 are threadedly connected with the leaking pipe 3, and the rubber bag 5 is wrapped around the leaking pipe 3 The outside is fixed on the outside of the joint one 2 and the joint two 4 through the fastening ring 24, and forms a plugging cavity 27 with the leaking pipe 3; To guide the test probe to slide smoothly in the borehole;

The tail occluder 23 includes two joints three 7, a leaking pipe 3 and a rubber bag 5, and the rubber bag is fixed between the two joints three 7 by a fastening ring 21;

The external thread of the joint three 7 is connected to the circular baffle 11, and the diameter of the circular baffle 11 is larger than that of the rubber bag 5, preventing the rubber bag 5 from falling off; the center baffle 11 is threaded and detachable, which is convenient for replacing the rubber bag 5 ;

The external water source enters the plugging cavity 27 through the water leakage hole 33 in the front occluder 30 and the rear occluder 31, and a water injection cavity 26 is formed between the swelling corresponding rubber bag 5 and the drill hole 28;

The number of the converter 6 is one, and the whole is cylindrical, with a stepped through hole in the middle, and its left and right ends are respectively threaded with the connecting pipe 25 and the joint 24;

Four side leakage holes 35, four water diversion holes 19 and a sunken sump 18 are arranged symmetrically around the central circular hole inside the converter 6. The water hole 19 is connected; the outer wall of the water diversion hole 19 is provided with a boss 20 and a cross wire sleeve 29, and the boss 20 acts as a limiter, and the cross wire sleeve 29 is threadedly connected with the outer wall of the water diversion hole 19 and rotates thereon;

The inner ring 34 is in the shape of a cylindrical ring, the left end surface is larger than the right end surface, and it is sleeved outside the stepped through hole; the outer wall of the inner ring 34 forms a 30° sealing cone surface 23 that matches the inner wall of the converter 6, which acts as a seal. Correspondingly, there are four "L-shaped" water passage holes 17 in the interior, which communicate with the side leakage hole 35, and the side leakage hole 35 communicates with the stepped through hole;

The inner ring 34 slides left and right along the interior. In the initial state, due to the action of the spring 22, the inner ring 34 is at the right end, and the water hole 17 is sealed. When the external water source acts on the right end surface of the inner ring 34 through the side leakage hole 35 , the inner ring 34 moves to the left until the left end surface of the inner ring 34 contacts the boss 20. At this time, the water hole 17 is just connected to the water collection tank 18, and the external water source is discharged to the water injection cavity 26 through the water distribution hole 19. Inside;

The spring 22 is located between the inner ring 34 and the cross wire sleeve 29, and the tension of the spring 22 is changed by adjusting the cross wire sleeve 29, thereby controlling the opening pressure of the inner ring 34; the cross wire sleeve 29 is provided with four rectangular The baffle and the surrounding are hollow, which is not only convenient to use external tools for rotation adjustment, but also facilitates the passage of water inside the water injection cavity 26, and the feedback acts on the left end surface of the inner ring 34;

The connecting pipe 25 is a sealed hollow pipe, and the number is one;

The working principle of the converter 6:

(1) When the inner ring 34 satisfies P _left S _{ring left} +kx≤P _right S _{ring right} , then the inner ring 34 moves to the left, the water hole 17 is connected with the sump 18, and the water source passes through the water diversion hole 19 to the water injection space. Cavity 26 carries out water injection observation;

(2) When the inner ring 34 satisfies P _left S _{ring left} +kx≥P _right S _{ring right} , the inner ring 34 moves to the right, the water hole 17 is closed by the pipe wall, and the water supply to the water injection cavity 26 is stopped;

Among them, _{the left} side of P is the low-pressure _observation water source pressure on the side of the water injection cavity, which is generally about 0.2-0.5MPa; Water area, _{the right side of the S ring} is the water passing area of the right end surface of the inner ring, k is the elastic coefficient of the outer spring, and x is the compression amount;

The water discharge switch 12 is responsible for releasing the pressure water in the plugged cavity 27 after the push test is finished, so that the rubber bag 5 is out of contact with the borehole 28, so that the drilling rig 11 is convenient for advancing the test probe; the master control switch 15 is responsible for stopping the supply of the external water source , the flowmeter 13 is responsible for detecting the external water source to input the real-time water volume to the test probe, and the indications of the mechanical pressure gauge 14 and the electronic pressure gauge 16 are compared with each other for inspection, if they are approximately equal, then it shows that the pressure is effective.

Beneficial effects of the present invention:

(1) The present invention proposes a variable pressure adjustable rock mass fracture permeability test device. Compared with the prior art, the device can use the same external water source to realize the two processes of plugging and observation, and ensure that the two processes are under their respective pressures. Work down, reduce the number of pipes in the borehole to 1, avoid the problem of drill pipe winding, and improve the stability of the working process.

(2) The converter in the device realizes the conversion from high-pressure water source to low-pressure water source, cooperates with the sealing cone of the inner ring, improves the sealing performance and opening pressure, adjusts the compression degree of the spring through the cross wire sleeve, and controls the inner ring to have different opening And conversion pressure, so that the range of pressure regulation of the converter is wider, the method is simple, the process is stable, and it can adapt to different work requirements.

(3) The design of the sump can solve the problem of the incompatibility between the water hole and the water diversion hole, and ensure that no matter how the inner ring rotates, the water in the water hole can flow to the water diversion hole through the sump, and at the same time, the water diversion hole is open Designed parallel to the borehole, it reduces the direct impact of the water flow on the borehole wall.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure and observation state of the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 2 is a schematic diagram of the pressure relief and advancing state of the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 3 is the structural schematic diagram of the test probe in the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 4 is a schematic diagram of the structure of the front plugging device in the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 5 is a schematic diagram of the structure of the tail blocker in the variable pressure adjustable rock mass fissure permeability testing device of the present invention;

Fig. 6 is a schematic diagram of the cross-sectional structure of the converter in the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 7 is the left side view of the converter in the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 8 is the right side view of the converter in the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 9 (a) is a schematic diagram of the static state of the converter in the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 9 (b) is a schematic diagram of the working state of the converter in the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 10 is a schematic diagram of the structure of the inner ring in the pressure-variable adjustable rock mass fissure permeability testing device of the present invention;

Fig. 11 is a schematic diagram of the structure of the middle cross wire sleeve in the pressure-variable adjustable rock mass fracture permeability testing device of the present invention.

In the figure: 1 guide head; 2 joint one; 3 leaking pipe; 4 joint two; 5 rubber bag; 6 converter; 7 joint three; 8 circular baffle; 9 drill pipe; Water discharge switch; 13 flow meter; 14 mechanical pressure gauge; 15 master control switch; 16 electronic pressure gauge; 17 water hole; 18 water collection tank; 19 water distribution hole; 20 boss; Cone surface; 24 rock mass to be tested; 25 connecting pipe; 26 water injection cavity; 27 plugging cavity; 28 drilling; ; 33 leakage holes; 34 inner rings; 35 side leakage holes.

Detailed ways

The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

A pressure-variable and adjustable rock mass fracture permeability testing device, including a plugging device, a converter 6, a connecting pipe 25, a drilling rig 11, a drill pipe 9 and a control console 32; the plugging device further includes a front plug Blocker 30 and tail blocker 31;

The converter 6 is threadedly connected to the tail of the front occluder 30, and its interior includes an inner ring 34, a spring 22 and a cross wire sleeve 29. By adjusting the position of the cross wire sleeve 29, the compression degree of the spring 22 is changed, thereby controlling Opening pressure of the inner ring 34; after the front occluder 30 and the rear occluder 31 are inflated, they form a water injection cavity 26 with the borehole 28, and the external high-pressure water enters the water injection cavity 26 through the converter 6 and faces the borehole 28 Fracture permeability detection;

The drilling rig 11 is connected with the test probe through the drill rod 9, and is used to lengthen and advance the test probe to a designated area. The drill rod 9 is a hollow rod, and the inside of the drill rod 9 can transport external high-pressure water sources. Between the drill rod 9 and the test probe Threaded connection, detachable;

The control console 32 is connected to the drill pipe 9 through a high-pressure hose 10, and includes a water discharge switch 12, a flow meter 13, a mechanical pressure gauge 14, a master control switch 15 and an electronic pressure gauge 16. The control console 32 is responsible for providing a predetermined pressure Water source, pressure relief and release of water, and detection and recording of parameters such as pressure and flow;

The front part occluder 30 includes a joint one 2, a leaking pipe 3, a joint two 4 and a rubber bag 5, the joint one 2 and the joint two 4 are threadedly connected with the leaking pipe 3, and the rubber bag 5 is wrapped around the leaking pipe 3 The outside is fixed on the outside of the joint one 2 and the joint two 4 through the fastening ring 24, and forms a plugging cavity 27 with the leaking pipe 3; To guide the test probe to slide smoothly in the borehole;

The tail occluder 23 includes two joints three 7, a leaking pipe 3 and a rubber bag 5, and the rubber bag is fixed between the two joints three 7 by a fastening ring 21;

The external thread of the joint three 7 is connected to the circular baffle 11, and the diameter of the circular baffle 11 is larger than that of the rubber bag 5, preventing the rubber bag 5 from falling off; the center baffle 11 is threaded and detachable, which is convenient for replacing the rubber bag 5 ;

The external water source enters the plugging cavity 27 through the water leakage hole 33 in the front occluder 30 and the rear occluder 31, and a water injection cavity 26 is formed between the swelling corresponding rubber bag 5 and the drill hole 28;

The number of the converter 6 is one, and the whole is cylindrical, with a stepped through hole in the middle, and its left and right ends are respectively threaded with the connecting pipe 25 and the joint 24;

Four side leakage holes 35, four water diversion holes 19 and a sunken sump 18 are arranged symmetrically around the central circular hole inside the converter 6. The water hole 19 is connected; the outer wall of the water diversion hole 19 is provided with a boss 20 and a cross wire sleeve 29, and the boss 20 acts as a limiter, and the cross wire sleeve 29 is threadedly connected with the outer wall of the water diversion hole 19 and rotates thereon;

The inner ring 34 is in the shape of a cylindrical ring, the left end surface is larger than the right end surface, and it is sleeved outside the stepped through hole; the outer wall of the inner ring 34 forms a 30° sealing cone surface 23 that matches the inner wall of the converter 6, which acts as a seal. Correspondingly, there are four "L-shaped" water passage holes 17 in the interior, which communicate with the side leakage hole 35, and the side leakage hole 35 communicates with the stepped through hole;

The inner ring 34 slides left and right along the interior. In the initial state, due to the action of the spring 22, the inner ring 34 is at the right end, and the water hole 17 is sealed. When the external water source acts on the right end surface of the inner ring 34 through the side leakage hole 35 , the inner ring 34 moves to the left until the left end surface of the inner ring 34 contacts the boss 20. At this time, the water hole 17 is just connected to the water collection tank 18, and the external water source is discharged to the water injection cavity 26 through the water distribution hole 19. Inside;

The spring 22 is located between the inner ring 34 and the cross wire sleeve 29, and the tension of the spring 22 is changed by adjusting the cross wire sleeve 29, thereby controlling the opening pressure of the inner ring 34; the cross wire sleeve 29 is provided with four rectangular The baffle and the surrounding are hollow, which is not only convenient to use external tools for rotation adjustment, but also facilitates the passage of water inside the water injection cavity 26, and the feedback acts on the left end surface of the inner ring 34;

The connecting pipe 25 is a sealed hollow pipe, and the number is one;

The working principle of the converter 6:

(1) When the inner ring 34 satisfies P _left S _{ring left} +kx≤P _right S _{ring right} , then the inner ring 34 moves to the left, the water hole 17 is connected with the sump 18, and the water source passes through the water diversion hole 19 to the water injection space. Cavity 26 carries out water injection observation;

(2) When the inner ring 34 satisfies P _left S _{ring left} +kx≥P _right S _{ring right} , the inner ring 34 moves to the right, the water hole 17 is closed by the pipe wall, and the water supply to the water injection cavity 26 is stopped;

Among _them , _{the left} side of P is the low-pressure observation water source pressure on the side of the water injection cavity, which is generally about 0.2-0.5MPa; Water area, _{the right side of the S ring} is the water passing area of the right end surface of the inner ring, k is the elastic coefficient of the outer spring, and x is the compression amount;

The water discharge switch 12 is responsible for releasing the pressure water in the plugged cavity 27 after the push test is finished, so that the rubber bag 5 is out of contact with the borehole 28, so that the drilling rig 11 is convenient for advancing the test probe; the master control switch 15 is responsible for stopping the supply of the external water source , the flowmeter 13 is responsible for detecting the external water source and inputs the real-time water volume to the test probe, and the indications of the mechanical pressure gauge 14 and the electronic pressure gauge 16 are compared with each other for inspection, and if roughly equal, then it shows that the pressure is effective.

An observation method of a variable pressure adjustable rock mass fracture permeability testing device, the steps are as follows:

(1) Construction drilling 28: According to the pre-designed construction requirements, use the drilling rig 11 to construct 3 to 5 drilling holes with different orientations and inclination angles a in the rock mass 24 area to be tested. The diameter of the drilling 28 is 89mm and the length is about 70m , and clean up the debris in the borehole 28;

(2) Installation equipment: install the guide cone, front occluder 30, tail occluder 31, converter 6, connecting pipe 25, and connect the drilling rig 11, drill pipe 9, high-pressure hose 10 and control console 32 in sequence , and then use the drilling machine 11 to move the test probe to the initial position of the borehole 11;

(3) Sealing inspection: first turn off the water discharge switch 12 of the control console 32, turn on the master control switch 15, provide the testing water pressure to the test probe, and check the sealing and sealing performance of the rubber bag 5. If there is no obvious water leakage, then carry out The next step, otherwise return to step (2), check the connection and installation of each component, and then perform step (3) again until it is qualified;

(4) Carry out pressurized water observation: after the seal inspection is qualified, carry out the pressurized water test to detect the permeability of the 28-hole section of the borehole, make the test probe be in the initial position, close the water discharge switch 12 and open the master control switch 15 again, and provide high pressure to the test probe The water source enters the plugging cavity 27 through the connecting pipe 25 and the leaking pipe 3, and the rubber bag 5 of the front plugging device 30 and the rear plugging device 31 are inflated to form a water injection cavity 26 with the drilling 28 to adjust the pressure of the external water source Gradually increase to 1.5MPa. After the high-pressure water source is converted to a low-pressure detection water source by the converter 6, it is sent to the water injection cavity 26. After the flow rate is stable, record the value Q _i of the flow meter when it is stable at this time and record the detection. distance L _i ;

(5) Pressure relief and advancement: close the master control switch 15, open the water release switch 12, release the pressure of the plugged cavity 27, and after the rubber bag 5 is out of contact with the drill hole 28, close the water discharge switch 12, and take another drill pipe 9 to connect Long test probe, utilize drilling rig 11 to advance test probe to the next detection area, repeat step (4) operation, until measuring the length of borehole 28;

(6) Calculation and analysis: According to the length of the borehole 28 and the water leakage in the corresponding observation hole section, the flow distribution diagrams in different boreholes 28 are drawn respectively, and the permeability characteristics and fracture development characteristics of different positions within the length range of the borehole 28 are analyzed, and further combined with different The azimuth drilling inclination a and the accumulative length of the continuous water leakage section (that is, the zero point of the abrupt change in permeability) L _n (n=1+2+....+k) can be used to calculate the damage range of the rock mass in different spatial ranges.

The parts not mentioned in the present invention can be realized by adopting or referring to the prior art.

Although terms such as converter 6, inner ring 34, and water diversion hole 19 are used more frequently in this paper, the possibility of using other terms is not excluded, and those skilled in the art make these terms under the inspiration of the present invention. All should be within the protection scope of the present invention.

Claims (6)

1. a kind of change pressure adjustable rock cranny testing permeability device, which is characterized in that the change pressure adjustable rock mass is split Gap testing permeability device includes plugging device, converter (6), communicating pipe (25), drilling machine (11), drilling rod (9) and control operation console (32)；The plugging device further comprises front plugging device (30) and tail portion plugging device (31)；

The converter (6) is threadedly connected to front plugging device (30) tail portion, it is internal comprising inner ring (34), spring (22) and Cross silk braid (29) changes the compression degree of spring (22), and then control inner ring by adjusting the position of cross silk braid (29) (34) Opening pressure；

Leakage hole (33) injection that external source passes through in leak pipe (3) blocks cavity (27) and plays swollen rubber bag tank (5), and front blocks After device (30) and tail portion plugging device (31) are swollen, water filling cavity (26) is formed with drilling (28), external high pressure water passes through converter (6) enter in water filling cavity (26) and drilling (28) fissure permeability is detected；

The drilling machine (11) is connected by drilling rod (9) with test probe, to spreading and promotes test probe to specified area Domain, drilling rod (9) are hollow stem, internal to can transport extraneous high-pressure water, and drilling rod (9) is threaded between test probe, Detachably；

The control operation console (32) is connect by high-pressure hose (10) with drilling rod (9), including cock of water drain (12), flowmeter (13), mechanical pressure gauge (14), master control switch (15) and electronic pressure gage (16), control operation console (32) are responsible for providing pre- level pressure Power water source, release discharge water, and detect and record pressure, flow；

External source is entered by leakage hole (33) in front plugging device (30), tail portion plugging device (31) blocks cavity (27), rises Water filling cavity (26) is formed between swollen corresponding rubber bag tank (5) and drilling (28)；

Described converter (6) quantity is one, whole cylindrical, and centre is provided with ladder hole, left and right ends respectively with Communicating pipe (25), connector two (4) are threadedly coupled；

The converter (6) is internal, four side leakage holes (35) are symmetrical arranged around intermediate round hole, four tapping holes (19) and The catch basin (18) of one indent, catch basin (18) are located on the right side of tapping hole (19), are connected with tapping hole (19)；Tapping hole (19) outer wall setting boss (20) and cross silk braid (29), boss (20) play position-limiting action, cross silk braid (29) and tapping hole (19) outer wall is threaded, rotate on it；

The inner ring (34) is in cylinder ring shape, and left side is more than right side, is set in outside ladder hole；Inner ring (34) is outside Wall formed with the matched 30 ° of sealing cones (23) of converter (6) inner wall, seal, inside be correspondingly arranged on 4 " L Type " limbers (17), corresponding with side leakage hole (35) to communicate, side leakage hole (35) are communicated with ladder hole；

The inner ring (34) horizontally slips along inside, and under original state, due to the effect of spring (22), inner ring (34) is in Right end, limbers (17) are sealed, when external source acts on inner ring (34) right side by side leakage hole (35), inner ring (34) to It moves left, until when inner ring (34) left side is contacted with boss (20), at this point, limbers (17) are just connected with catch basin (18), External source is drained by tapping hole (19) in water filling cavity (26)；

The spring (22) is located between inner ring (34) and cross silk braid (29), changes spring by adjusting cross silk braid (29) (22) tensioning degree, and then control the Opening pressure of inner ring (34)；There are four rectangular baffles for cross silk braid (29) setting And periphery is hollow, is not only convenient for carrying out rotation adjusting using external tool, and convenient for the internal water source of water filling cavity (26) pass through, Feedback effect is in inner ring (34) left side；

Described converter (6) operation principle：

(1) when inner ring (34) meets P_{It is left}S_{Ring is left}+kx≤P_{It is right}S_{Ring is right}When, then inner ring (34) is moved to the left, limbers (17) and catch basin (18) it is connected to, water source carries out water filling observation by tapping hole (19) to water filling cavity (26)；

(2) when inner ring (34) meets P_{It is left}S_{Ring is left}+kx≥P_{It is right}S_{Ring is right}When, then inner ring (34) moves right, and limbers (17) are sealed by tube wall It closes, stops supplying water to water filling cavity (26)；

Wherein, P_{It is left}Source pressure is observed for water filling cavity (26) side low pressure, is 0.2~0.5MPa or so；P_{It is right}For communicating pipe (25) The high-pressure water pressure provided is 0.8~1MPa or so, S_{Ring is left}For inner ring (34) left side discharge area, S_{Ring is right}For inner ring (34) right side discharge area, k are the coefficient of elasticity of spring (22), and x is decrement；

The cock of water drain (12) is responsible for that the interior pressure water release of cavity (27) will be blocked after promoting test, makes rubber bag tank (5) it is disengaged with drilling (28), test probe is promoted convenient for drilling machine (11)；Master control switch (15) is responsible for stopping for external source For flowmeter (13) is responsible for detection external source and inputs real-time water, mechanical pressure gauge (14) and electron pressure to test probe The registration of table (16) is compared inspection, if roughly the same, shows that pressure is effective.

2. change pressure adjustable rock cranny testing permeability device according to claim 1, which is characterized in that before described Portion's plugging device (30) includes connector one (2), leak pipe (3), connector two (4) and rubber bag tank (5), connector one (2) and connector two (4) It is threaded with leak pipe (3), rubber bag tank (5) surrounds leak pipe (3) outside, and connector one is fixed on by tight loop (24) (2) it is formed between the outside of connector two (4), with leak pipe (3) and blocks cavity (27)；Connector one (2) outer end is threadedly coupled guiding Head (1), seeker (1) play the guiding role, to guide test probe to smooth out sliding in the borehole.

3. change pressure adjustable rock cranny testing permeability device according to claim 1 or 2, which is characterized in that described Tail portion plugging device (23) include two connectors three (7), leak pipe (3) and rubber bag tank (5), rubber bag tank by tight loop (21) consolidate It is scheduled between two connectors three (7).

4. change pressure adjustable rock cranny testing permeability device according to claim 3, which is characterized in that described connects First three (7) external screw-threads connection circular baffle plate (11), circular baffle plate (11) diameter is big compared with rubber bag tank (5) diameter, prevents rubber bag tank (5) it falls off；Center of circle baffle (11) is threaded, and detachably, is conveniently replaceable rubber bag tank (5).

5. change pressure adjustable rock cranny testing permeability device according to claim 1,2 or 4, which is characterized in that institute The communicating pipe (25) stated is sealed hollow tube, and quantity is 1.

6. change pressure adjustable rock cranny testing permeability device according to claim 3, which is characterized in that the company Siphunculus (25) is sealed hollow tube, and quantity is 1.