CN103983522B - Compression test of rock hydraulic pressure steel capsule and test method thereof - Google Patents

Abstract

The invention discloses a hydraulic steel bag for a rock compression test and a test method thereof, relates to the technical field of rock mechanics tests, and comprises a bag body, an oil inlet pipe, an oil outlet pipe and a quick joint. It is welded, and the oil inlet pipe and the oil outlet pipe are arranged symmetrically on the capsule, and the oil inlet pipe and the oil outlet pipe are made of flexible steel pipes, and the ends are connected with quick connectors. The hydraulic steel bag provided by the present invention provides pressure to the rock specimen by using the deformation generated by the toughness of the steel, and continuously accumulates the deformation to provide a strong load, which completely changes the working mode and structure of using a press to provide load during the rock compression test. Simple, accurate test data; using this test method can realize uniaxial, biaxial and triaxial loading tests of rocks, can undertake rockburst tests, and can control the deformation of the test piece by controlling the oil pressure of a single hydraulic steel bag, It is suitable for research institutions to vigorously promote the rock unloading test.

Description

Hydraulic steel bladder for rock compression test and its test method

technical field

The invention relates to the technical field of rock mechanics tests, in particular to a hydraulic steel bag for rock compression tests and a test method thereof.

Background technique

The maximum stress that a rock can withstand when it reaches failure under various loads is called the strength of the rock. For example, the maximum compressive stress that can be borne under uniaxial compressive load is called uniaxial compressive strength, or unrestricted compressive strength; called the triaxial compressive strength of the rock.

The load of the laboratory rock press is provided by machinery, oil or gas, and almost all of them are powered by acting on the external pressure head to exert pressure on the rock specimen. The structure is relatively complicated and the cost is expensive.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a hydraulic steel bag for rock compression test and its test method, which is different from other presses in that it uses the deformation generated by the toughness of the steel to provide pressure to the rock test piece, through continuous The deformation accumulation provides a strong load, the structure is simple, and the design is ingenious, which provides a new idea for the development of rock mechanics pressure tests.

To achieve the above object, the present invention adopts the following technical solutions:

A hydraulic steel bag for rock compression test, including a bag body, an oil inlet pipe, an oil outlet pipe and a quick connector, the bag body is welded by two steel plates with the same size around the edges, and the oil inlet pipe is symmetrically arranged on the bag body and the oil outlet pipe, the oil inlet pipe and the oil outlet pipe are made of flexible steel pipes, and the ends are connected with quick connectors.

A test method of a hydraulic steel bladder for a rock compression test is realized through the following steps:

1) Select a plurality of hydraulic steel bladders in groups and place them side by side on at least two opposite surfaces of the square rock specimen, and the oil inlet pipes or oil outlet pipes of two adjacent bladders are arranged in a staggered manner;

2) Place the above-mentioned hydraulic steel bag together with the rock specimen in a rigid test box to ensure that the test space is not deformed;

3) Adjust the manual pressure head of the test box so that the hydraulic steel bladders on at least two sides of the rock specimen are pressed against each other and the gap is minimized;

4) Connect the oil inlet pipe and oil outlet pipe of each hydraulic steel bag to the oil pressure control device through quick connectors;

5) Adjust the oil pressure control device, the hydraulic oil enters the bladder from the oil inlet pipe, the bladder of each hydraulic steel bladder is deformed due to the pressure of the hydraulic oil, and the deformation of multiple hydraulic steel bladders accumulates to produce a large axial deformation, which is Rock compression tests provide sufficient loads to conduct various rock compression tests.

The hydraulic steel bag provided by the present invention provides pressure to the rock specimen by using the deformation generated by the toughness of the steel, and continuously accumulates the deformation to provide a strong load, which completely changes the working mode and structure of using a press to provide load during the rock compression test. Simple, accurate test data; using this test method can realize uniaxial, biaxial and triaxial loading tests of rocks, can undertake rockburst tests, and can control the deformation of the test piece by controlling the oil pressure of a single hydraulic steel bag, Carry out rock unloading test; according to the condition of the rock test piece, the hydraulic steel bag can be processed into different sizes, and it only needs to be combined with a high-strength box and an oil pressure device to perform a large-scale rock compression test, which is widely used. It is suitable for vigorous promotion by research institutions.

Description of drawings

Fig. 1 is a schematic diagram of a hydraulic steel bag of the present invention;

Fig. 2 is that the present invention carries out test schematic diagram;

Fig. 3 is the structural representation of test box;

FIG. 4 is a schematic longitudinal section of FIG. 3 .

detailed description

The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:

As shown in Fig. 1, it is a specific embodiment of the present invention, the hydraulic steel bag for rock compression test, comprising a bag body 1, an oil inlet pipe 2, an oil outlet pipe 3 and a quick joint 4, and the bag body 1 is composed of two pieces of the same size The surrounding edges of the steel plate are welded. The capsule body 1 is symmetrically provided with an oil inlet pipe 2 and an oil outlet pipe 3. The oil inlet pipe 2 and the oil outlet pipe 3 are made of flexible steel pipes, and are connected with quick connectors 4 at the ends.

As shown in Figure 2, the test method utilizing the hydraulic steel bladder for the rock compression test is realized through the following steps:

1) Select a plurality of hydraulic steel bladders in groups and place them side by side on at least two opposite surfaces of the square rock specimen, and the oil inlet pipes 2 or oil outlet pipes 3 of two adjacent capsules 1 are arranged in a staggered manner;

2) Place the above-mentioned hydraulic steel bag together with the rock specimen in a rigid test box to ensure that the test space is not deformed;

3) Adjust the manual pressure head of the test box so that the hydraulic steel bladders on at least two sides of the rock specimen are pressed against each other and the gap is minimized;

4) Connect the oil inlet pipe 2 and oil outlet pipe 3 of each hydraulic steel bag to the oil pressure control device through the quick joint 4;

5) Adjust the oil pressure control device, the hydraulic oil enters the bladder body 1 from the oil inlet pipe 2, and the bladder body 1 of each hydraulic steel bladder is deformed due to the pressure of the hydraulic oil, and the deformation accumulation of multiple hydraulic steel bladders produces a large axial force. Deformation, providing sufficient load for rock compression tests, so as to carry out various rock compression tests.

Example 1:

According to this test method, a rock compression uniaxial test is carried out. Multiple hydraulic steel bladders are selected and divided into two groups, which are respectively placed on two opposite sides of a square rock specimen. Other test steps are as described above and will not be described here.

Example 2:

According to this test method, the rock compression biaxial test is carried out. Multiple hydraulic steel bladders are selected and divided into four groups, which are respectively placed on the four opposite front, rear, left and right sides of the square rock specimen. Other test steps are as described above. Not too much description here.

Example 3:

As shown in Fig. 3 and Fig. 4, according to the test method, a test chamber is designed in this embodiment, and a true triaxial test of accumulative deformation loading is carried out by using a hydraulic steel bladder structure.

The test box includes a base 10, a box body 11, a box cover 12, a hydraulic steel bag 6 and a manual indenter 13. The box body 11 is fixed on the base 10, and the box cover 12 is fixed on the top of the box body 11 and is detachable. , the inner center of the box 11 is used to place the test piece, and a plurality of hydraulic steel bags 6 are arranged around and on the top of the test piece, and pads are respectively arranged on the periphery of the hydraulic steel bags 6 arranged around and on the top of the test piece. block, the hydraulic steel bag 6 is connected to the oil pipe of the external oil pressure control device through the oil inlet pipe 2 and the oil outlet pipe 3, and the manual pressure head 13 is set to two, which are respectively screwed into the box body through the adjacent two sides of the box body 1 1, the hydraulic steel bag 6 is indirectly squeezed through the cushion block.

In this embodiment, two manual pressure heads 13 are respectively arranged on the right side and the rear side of the box body 11 .

The box body 11 has a square symmetrical structure and is made of thick steel plates. Its four side panels are riveted into one body and fixed on the base 10. The four corners of the bottom are respectively provided with columns 7, and the box cover 12 is provided with There are four holes corresponding to the column 7, and the box cover 12 is fixed on the top of the box body 11 by the nut 8.

The capsule body of the hydraulic steel bag 6 is welded by two steel plates with the same size around the edges. The oil inlet pipe 2 and the oil outlet pipe 3 of the hydraulic steel bag 6 are symmetrically arranged, and are connected with the external oil pressure through the hole at the bottom of the box body 11. The pressure device is connected, and the oil inlet pipe 2 and the oil outlet pipe 3 of every two adjacent hydraulic steel bladders 6 are arranged in a staggered manner, and no overlap can occur, so as to avoid extrusion or even rupture between the oil pipes.

The cushion block adopts a block cushion block 14 or a plate cushion block 5, and the space between the stacked hydraulic steel bags 6 is minimized by rotating the manual pressure head 13.

It also includes ribs 9 which are respectively fixedly connected with the box body 11 and the base 10 for supporting the box body 11 . In this embodiment, there are two ribs 9 on each side.

The installation test process using this test box is as follows:

1. Put the rock test piece in the middle of the bottom of the box body 11, and oil the sides of the hydraulic steel bag 6, block pad 14 and plate pad 5 to reduce friction during the test;

2. Predict the amount of deformation in advance according to the lithology of the rock test piece, select multiple hydraulic steel bladders 6 that are slightly smaller than the side of the rock test piece, and reserve deformation gaps to ensure that the steel bladders will not bite each other after compression deformation influences;

3. Place block pads 14 or plate pads 5 close to the hydraulic steel bag 6;

4. Rotate the manual pressure head 13 on the rear side and right side of the box body 11, so that the hydraulic steel bladders 6 around the test piece are tightly pressed together to minimize the gap;

5. The hydraulic steel bag 6 is connected to the oil inlet pipe 2 and the oil outlet pipe 3, and the oil inlet pipe 2 and the oil outlet pipe 3 are led out through the hole at the bottom of the box body 11;

6. Place multiple hydraulic steel bags 6 on the top of the test piece, connect the oil inlet pipe 2 and the oil outlet pipe 3, select an appropriate block spacer 14 or plate spacer 5 and place it on the top of the test piece to exceed the height of the box body 11, and cover it Case cover 12, case cover 12 is tightened and fixed with nut 8, and guarantees its level;

7. Adjust the oil pressure control equipment and conduct a test.

Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present invention shall also belong to the present invention. protection scope of the invention.

Claims (1)

1. A test method for a hydraulic steel bladder used in a rock compression test, the hydraulic steel bladder comprising a bladder (1), an oil inlet pipe (2), an oil outlet pipe (3) and a quick connector (4), the bladder ( 1) It is formed by welding the surrounding edges of two steel plates with the same size. The oil inlet pipe (2) and the oil outlet pipe (3) are symmetrically arranged on the capsule body (1). The oil inlet pipe (2) and the oil outlet pipe (3) A flexible steel pipe is used, and a quick connector (4) is connected at the end, which is characterized in that it is realized through the following steps: 1) Select a plurality of hydraulic steel bladders in groups and place them side by side on at least two opposite surfaces of the square rock specimen, and the oil inlet pipes (2) or oil outlet pipes (3) of two adjacent bladders (1) are arranged in a staggered manner; 2) Place the above-mentioned hydraulic steel bag together with the rock specimen in a rigid test box to ensure that the test space is not deformed; 3) Adjust the manual pressure head of the test box so that the hydraulic steel bladders on at least two sides of the rock specimen are pressed against each other and the gap is minimized; 4) Connect the oil inlet pipe (2) and oil outlet pipe (3) of each hydraulic steel bag to the oil pressure control device through the quick connector (4); 5) Adjust the oil pressure control device, the hydraulic oil enters the bladder (1) from the oil inlet pipe (2), the bladder (1) of each hydraulic steel bladder is deformed due to the pressure of the hydraulic oil, and the deformation of multiple hydraulic steel bladders accumulates It produces large axial deformation and provides sufficient load for rock compression tests, so that various rock compression tests can be carried out.