CN114383908B - A saturator, triaxial test sample preparation device and sample preparation method - Google Patents

Abstract

The invention discloses a saturator, a triaxial test sample preparation device and a sample preparation method. In the saturator, the first cylinder unit includes two semicircular shells with a 1/4 circular inner shell fixed on the inner wall; the second cylinder unit includes The fixed ring and two 1/4-circle inner shells arranged opposite to each other in the fixed ring; two semi-circular shells enclose to form an outer cylinder, and four 1/4-circle inner shells enclose to form an inner cylinder; the inner cylinder is provided with an outer ring , the outer ring is provided with a force application hole for inserting the pressure rod; the outer ring is located at the top of the outer cylinder, below the fixed ring; the sampler includes a sampling sleeve, a sampling iron ring and a magnetic pressure ring arranged in sequence from top to bottom. The ring is provided with a pressure rod; the limit sleeve includes a cylinder body and a detachable base, the cylinder body is provided with a strip-shaped opening adapted to the pressure rod, and the top of the cylinder body is provided with a screw hole for fixing the sampling sleeve. The invention can reduce the number of sampling times and the contact area between a single valve mold and the sample, realize the synchronous sampling and mantle, ensure the integrity of the sample from sampling to the mantle, and improve the reliability of data.

Description

A saturator, triaxial test sample preparation device and sample preparation method

technical field

The invention relates to the preparation of triaxial test samples of geotechnical engineering, in particular to a saturator, a triaxial test sample preparation device and a sample preparation method.

Background technique

Triaxial test is a reliable method to obtain physical parameters of rock and soil in geotechnical engineering. The quality of sample preparation in the test has an important impact on the test accuracy and data reliability. In the current common saturator used for sample preparation, the sample preparation cylinder is composed of three-lobe moulds, and the single-lobe mold has a large contact area with the sample, which is easy to cause damage to the sample during sampling, and the sampling needs to be carried out three times. more. After the sampling is completed, the casing work is carried out, and the sample is prone to secondary damage during the casing. Such as CN109531798A, it has the following problems: (1) adopt three lobe molds to carry out sampling, promptly exist the problem that petal mold and sample contact area are big when demoulding, sampling frequency is many, and sample surface is easy to destroy; (2) be used for sampling There is no suitable force application point for the valve annulus, and it is easy to apply force unevenly during sampling to distort the valve mold and damage the sample; (3) There is no limit on the outside of the three-lobe mold during sampling, and it may obliquely carry the surface when the valve mold is about to peel off. The soil slides down and destroys the specimen. Another example is CN103969081A, which has the following problems: (1) the point of application of force is single when pressing down to sample, which is not in the vertical direction when easily causing the three-lobe mold to sample, so that the sample is squeezed and deformed by the three-lobe mold; (2) disposable when sampling Breaking away from the three-lobe mold, the contact area between the mold and the sample is relatively large, which is easy to cause damage to the surface of the sample; (3) The sample taken out is located in the piston cover and needs to be taken out again, and the sample needs to be covered with a film during the test, and the steps are cumbersome , easily cause sample damage.

Contents of the invention

Purpose of the invention: the purpose of this invention is to propose a kind of saturator that guarantees sample quality when demoulding, the second purpose of the present invention is to propose a kind of triaxial test sample preparation device that demoulding, mantle can carry out synchronously, the present invention The third purpose is to propose a triaxial test sample preparation method.

Technical solution: The saturator according to the present invention includes a sample preparation cylinder, the sample preparation cylinder includes a first cylinder unit and a second cylinder unit, the first cylinder unit includes two inner walls fixed with the first 1/4 The semicircular shell of the circular inner shell; the second cylinder unit includes a fixed ring and two second 1/4 circular inner shells arranged oppositely in the fixed ring; two semicircular shells are enclosed to form an outer cylinder, and four 1/4 circular The inner shell is enclosed to form an inner cylinder.

The present invention improves the traditional three-lobe saturator, including two separable cylinder units, so that the original need to complete the sampling in three times is reduced to two times, and at the same time reduces the difference between the sample and the single-lobe mold in each sampling. Contact area, the 1/4 circle inner shell (equivalent to the valve mold) is in contact with the sample, the contact area of a single valve mold is reduced from the original 1/3 circle to 1/4 circle, which can effectively reduce the damage of the sample during sampling .

Further, the end of the sample preparation cylinder is provided with a limit collar, and the limit collar and the first and second cylinder units are plugged and fixed by limit bolts, so that the saturator forms a whole, which is convenient for handling.

Further, the inner cylinder is provided with an outer ring, and the outer ring is symmetrically provided with force application holes for inserting the pressure rod; the outer ring is located on the top of the outer cylinder, below the fixing ring. The pressure rod is symmetrically inserted into the outer ring, and the pressure rod cooperates with the outer ring to separate the first cylinder unit downward, and the force is evenly applied, which can avoid the deformation of the soil sample due to uneven force during sampling.

The invention also protects a triaxial test sample preparation device, which includes a sampler, a limit sleeve and the above-mentioned saturator; the sampler includes a sampling sleeve, a sampling iron ring, and a magnetic pressure ring arranged in sequence from top to bottom Pressure rods are arranged on both sides of the pressure ring; the limit sleeve includes a cylinder body, the bottom of the cylinder body is provided with a detachable base, the cylinder body is provided with a strip opening for the pressure rod to move up and down, and the top of the cylinder body is provided with a fixed sampling valve. Screw holes for sleeves.

The limit sleeve can prevent the saturator in the sample from slipping obliquely with the surface soil and destroying the sample at the end of sampling. Butt the sampling sleeve with the sampling iron ring, fix the end of the rubber membrane on the outer wall of the sampling sleeve with a rubber band, pass through the inside of the sampling sleeve and wrap it on the outer wall of the sampling sleeve; then wrap the saturator and the rubber membrane Put the sampling sleeve into the limit sleeve in turn, after fixing the sampling sleeve through the screw hole on the limit sleeve, press down the outer ring to separate from the first cylinder unit, and then press down the magnetic pressure ring to separate from the second cylinder Body unit, when the magnetic pressure ring moves down, it drives the sampling iron ring to move down together under the action of the magnetic force, and sets the rubber film on the soil sample while sampling. The device of the present invention can realize simultaneous sampling and casing, simplifies the sample preparation process, and can ensure the integrity of the sample. It is suitable for sampling and coating of rock and soil materials with strong and weak cohesiveness, and is also suitable for sampling and coating of cohesive soil.

Further, a circumferential groove is provided on the top of the outer wall of the sampling sleeve. The circumferential groove cooperates with the rubber band to better fix the end of the rubber membrane.

Further, the sampling sleeve is provided with an air extraction hole, which is used to extract the air between the rubber membrane and the inner wall of the sampling sleeve after the sampling sleeve is wrapped with the rubber membrane, so that the rubber membrane is tightly attached to the sampling sleeve.

Further, the pressing rod is plugged and fixed on the magnetic pressing ring.

Further, the base is screwed to the barrel.

The present invention also protects a triaxial test sample preparation method, comprising the following steps:

(1) Pull out all the limit pins on the saturator, remove the limit collar, and put the saturator into the limit sleeve;

(2) Put the magnetic pressure ring into the limit sleeve, butt the sampling sleeve with the sampling iron ring, fix the end of the rubber film on the outer wall of the sampling sleeve with a rubber band, pass it through the inside of the sampling sleeve and wrap it in the sampling sleeve. on the outer wall of the sleeve;

(3) Put the sampling sleeve wrapped with the rubber film into the limit sleeve, and screw the screw into the screw hole to fix the sampling sleeve;

(4) Press down the outer ring to the bottom end of the bar-shaped opening to complete the detachment of the first cylinder unit; press down the magnetic pressure ring to the bottom end of the bar-shaped opening to complete the detachment of the second cylinder unit. The pressure ring slides down together to complete the film work.

As mentioned above, the present invention can realize simultaneous sampling and casing, simplifies the sample preparation process, and can ensure the integrity of the sample.

Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) the number of sampling is reduced, and the contact area between the sample and a single valve mold is reduced during sampling, which can reduce the degree of damage of the sample during sampling; (2) The sample preparation device has strong applicability and can realize simultaneous sampling and casing, which simplifies the sample preparation process, ensures the integrity of the sample from sampling to the casing, and improves the reliability of triaxial test data.

Description of drawings

Fig. 1 is the structural representation of sample preparation device;

Fig. 2 is the structural representation of sampler;

Fig. 3 is a structural schematic diagram of a magnetic pressure ring;

Fig. 4 is the structural representation of saturator;

Fig. 5 is a schematic structural view of the first cylinder unit;

Fig. 6 is a schematic structural view of the second cylinder unit;

Fig. 7 is a structural schematic diagram of a saturator cover;

Fig. 8 is a structural schematic diagram of a limit latch;

Fig. 9 is a structural schematic diagram of a limit sleeve.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

The triaxial test sample preparation device shown in FIG. 1 includes a sampler 1 , a saturator 2 and a limit sleeve 3 .

2 and 3, the sampler 1 includes a sampling sleeve 11, a sampling iron ring 12, and a magnetic pressure ring 13 arranged sequentially from top to bottom. The two sides of the magnetic pressure ring 13 are provided with pressure rods 14, and the pressure rods 14 are connected to the magnetic The pressure ring 13 is plugged and fitted. The sampling sleeve 11 is provided with an air extraction hole 16 , and the top of the outer wall of the sampling sleeve 11 is provided with a circumferential groove 15 . The top of the sampling sleeve 11, the bottom of the sampling iron ring 12 and the top of the magnetic pressure ring 13 are all smoothed to avoid damaging the rubber membrane.

4 to 8, the saturator 2 includes a sample preparation cylinder and two saturator covers 26, wherein the sample preparation cylinder includes a first cylinder unit 21 and a second cylinder unit 22, and the first cylinder unit 21 includes two The inner wall of the block is fixed with the semicircular outer shell 212 of the first 1/4 circular inner shell 211 . The second cylinder unit 22 includes a fixing ring 222 and two second 1/4 circular inner shells 221 disposed opposite to each other in the fixing ring 222 . Two semi-circular shells 212 are enclosed to form an outer cylinder, and four 1/4-circle inner shells are enclosed to form an inner cylinder. The inner cylinder is provided with an outer ring 23 , and the outer ring 23 is symmetrically provided with application holes for inserting the pressure rod. The outer ring 23 is located at the top of the outer cylinder, below the fixing ring 222 . Both ends of the sample preparation cylinder are provided with limit collars 24, and the limit collars 24 are evenly provided with four limit holes along the circumferential direction for inserting limit pins 27 to fix the first and second cylinder units. There is also a card slot at the position of the limit hole, which is used for fastening with the buckle of the cover 26 of the saturator, and the permeable stone 25 is placed in the sinker of the cover 26 of the saturator.

Referring to FIG. 9 , the limit sleeve 3 includes a cylinder body 32 and a base 31 , and the base 31 is provided with an external thread 34 , which is threadedly connected with the cylinder body 32 . The cylinder body 32 is provided with a strip-shaped opening 33 for the pressure rod 14 to move up and down, and the top of the cylinder body 32 is provided with a screw hole 35 for fixing the sampling sleeve 11 .

Triaxial test sample preparation method, comprising the following steps:

(1) Connect the cylinder body 32 and the base 31 through threads 34 to form a complete stop sleeve 3;

(2) Take out the saturator 2 that has been maintained to its age from the curing box, pull out all the stop pins 27, and remove the saturator cover 26 and the stop collar 24;

(3) Put the dismantled saturator 2 into the limit sleeve 3;

(4) Insert the pressing rod 14 into the magnetic pressing ring 13, and put the magnetic pressing ring 13 into the limit sleeve 3;

(5) Butt the sampling sleeve 11 with the sampling iron ring 12, fix the end of the rubber membrane to the circumferential groove 15 of the sampling sleeve 11 with a rubber band, pass through the inside of the sampling sleeve 11 and wrap it around the sampling sleeve 11 On the outer wall, use a dropper or an air pump to pump air at the air hole 16, so that the rubber film is close to the inner wall of the sampling sleeve 11, and the rubber film is flattened to complete the wrapping work of the rubber film;

(6) Put the sampling sleeve 11 wrapped with the rubber film into the limit sleeve 3, and screw in the screw at the screw hole 35 of the limit sleeve 3 to fix the sampling sleeve 11;

(7) Insert the pressing rod 14 in the force application hole of the outer ring 23, after pressing down the pressing rod 14 to the bottom end of the bar-shaped opening 33, remove the lowering pressing rod 14 to complete the detachment of the first cylinder unit 21;

(8) Press down the magnetic pressure ring 13 to the bottom of the bar-shaped opening 33 to complete the detachment of the second cylinder unit 22. As the sampling iron ring 12 slides down with the magnetic pressure ring 13, the mantle works on the second cylinder Simultaneous completion of unit 22 detachment;

(9) Unscrew the base 31, and take out the base 31, the first cylinder unit 21, the second cylinder unit 22, the limit sleeve 3 and the sample covered with the film in sequence.

Claims (7)

1. The utility model provides a triaxial test system appearance device which characterized in that: comprises a sampler (1), a limit sleeve (3) and a saturator;

the saturator comprises a sample preparation cylinder, wherein the sample preparation cylinder comprises a first cylinder body unit (21) and a second cylinder body unit (22), and the first cylinder body unit (21) comprises two semicircular outer shells (212) with first 1/4 circular inner shells (211) fixed on the inner walls; the second cylinder unit (22) comprises a fixed ring (222) and two second 1/4 circular inner shells (221) which are oppositely arranged in the fixed ring (222); two semicircular outer shells (212) are enclosed to form an outer cylinder, and four 1/4 circular inner shells are enclosed to form an inner cylinder; an outer sleeve ring (23) is arranged on the inner cylinder, and force application holes for inserting compression bars are symmetrically formed in the outer sleeve ring (23); the outer lantern ring (23) is positioned at the top of the outer barrel and below the fixed ring (222);

the sampler (1) comprises a sampling sleeve (11), a sampling iron ring (12) and a magnetic compression ring (13) which are sequentially arranged from top to bottom, and compression rods (14) are arranged on two sides of the magnetic compression ring (13); the limiting sleeve (3) comprises a barrel body (32), a detachable base (31) is arranged at the bottom of the barrel body (32), a strip-shaped opening (33) for the pressing rod (14) to move up and down is arranged on the barrel body (32), and a screw hole (35) for fixing the sampling sleeve (11) is formed in the top of the barrel body (32).

2. The triaxial test specimen preparing device according to claim 1, characterized in that: the top of the outer wall of the sampling sleeve (11) is provided with a circumferential groove (15).

3. The triaxial test specimen preparing device according to claim 1, characterized in that: and the sampling sleeve (11) is provided with an air suction hole (16).

4. The triaxial test specimen preparing device according to claim 1, characterized in that: the compression bar (14) is inserted and fixed on the magnetic compression ring (13).

5. The triaxial test specimen preparing device according to claim 1, characterized in that: the base (31) is in threaded connection with the cylinder (32).

6. The triaxial test specimen preparing device according to claim 1, characterized in that: the end part of the sample preparation cylinder is provided with a limiting collar (24), and the limiting collar (24) and the first cylinder body unit and the second cylinder body unit are fixedly spliced through a limiting bolt (27).

7. A triaxial test sample preparation method, which adopts the triaxial test sample preparation device according to claim 6, characterized in that: the triaxial test sample preparation method comprises the following steps:

(1) The limiting bolts (27) on the saturator are all pulled out, the limiting lantern ring (24) is taken down, and the saturator is placed into the limiting sleeve (3);

(2) The magnetic compression ring (13) is placed into the limit sleeve (3), the sampling sleeve (11) is in butt joint with the sampling iron ring (12), the tail end of the rubber film is fixed on the outer wall of the sampling sleeve (11) through an elastic band, and the rubber film penetrates out of the sampling sleeve (11) and is wrapped on the outer wall of the sampling sleeve (11);

(3) Placing the sampling sleeve (11) wrapped with the rubber film into the limit sleeve (3), and screwing in a screw hole (35) to fix the sampling sleeve (11);

(4) Pressing down the outer sleeve (23) to the bottom end of the strip-shaped opening (33) to complete the detachment of the first cylinder unit (21); and the magnetic pressing ring (13) is pressed down to the bottom end of the strip-shaped opening (33) to complete the detachment of the second cylinder unit (22), and meanwhile, the sampling iron ring (12) slides down along with the magnetic pressing ring (13) to complete the film sleeving work.

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