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Portable device and method for testing rock shearing strength

A technology of shear strength and testing device, applied in the field of rock mechanics test, can solve the problems of large difference in natural fracture surface state, distortion of friction strength, and high facility requirements, and achieve convenient on-site measurement and analysis, stable and reliable device, and convenient movement. Effect

Active Publication Date: 2017-05-17
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still many defects in the technique of determining the shear strength by the direct shear method.
First of all, using this scheme to test the shear strength requires fine cutting and grinding of the two shear surfaces of the rock sample. During this process, water or other fluids are required to lubricate and cool the cutting and grinding process. The introduced fluid The shear surface will be polluted to a greater extent, and the measured friction strength has a greater degree of distortion; secondly, the surface of the polished rock is smooth and uniform, and the roughness is small, while the natural fracture surface is often heterogeneous Strong toughness, large roughness and other characteristics, the state of the polished surface and the natural cracked surface during the test process is quite different; again, the entire test process needs to be matched with a servo hydraulic press, and the facility requirements are very high

Method used

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  • Portable device and method for testing rock shearing strength
  • Portable device and method for testing rock shearing strength
  • Portable device and method for testing rock shearing strength

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Embodiment 1

[0039] This embodiment provides a portable rock shear strength testing device, such as figure 1As shown, the device includes: caster 1, truss 2, limit block 3, vertical guide rail 4, left sample slot 5, tension sensor 7, displacement sensor 8, traction rope 9, anti-slip block 10, motor 11, data transmission line 12. Right sample tank 13, computer 14, holder 15, spherical seat 16, ball head 17, pressure bearing 18, crank 19, screw hole 20 and pressure sensor 21;

[0040] Wherein, the truss 2 provides rigid support for the portable rock shear strength testing device;

[0041] The bottom of the truss 2 is provided with the casters 1 to facilitate the movement of the portable rock shear strength testing device;

[0042] The limiting block 3 is arranged inside the bottom of the truss 2, one end of the vertical guide rail 4 is vertically connected to the upper end of the limiting block 3, and the side of the left sample groove 5 fits the vertical Guide rail 4, the stop block 3 def...

Embodiment 2

[0051] The present embodiment provides a kind of portable rock shear strength testing method, and the method adopts the testing device that embodiment 1 provides, and it comprises the following steps:

[0052] (1) Clean the collected rock blocks collected on-site to be measured, cut the cleaned rock blocks into regular shapes, and then split them into two halves to obtain two perfectly matching split surfaces to simulate natural cracks Surface, get two samples 6;

[0053] (2) open pressure sensor 21 and computer 14; And two samples 6 are packed into left sample groove 5 and right sample groove 13 respectively and fixed, make the crack face of two samples 6 opposite; The connecting rod 26 makes the top of the universal ball seat 25 close to the inside of the top of the truss 2, so as to lock the vertical movable space of the right sample groove 13 and ensure the detection accuracy of the displacement during the test; then the crank 19 passes through the pressure bearing 18 Pus...

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Abstract

The invention provides a portable device and method for testing rock shearing strength. The device comprises a truss, a limit block, a vertical guide rail, a left sample tank, a tension sensor, a displacement sensor, a traction rope, a slide-preventing block, a motor, a data transmission line, a right sample tank, a computer, a fixer, a spherical seat, a spherical head, a pressure bearing, a crank, a screw hole, a pressure sensor and the like. The device has the advantages that the device with a micro-box structure is high in integration level, stable, reliable, convenient to move and easy to apply on site; the real friction process of natural crack faces can be simulated, the crack faces are in completely-matched face-to-face contact during friction, and precise shearing strength can be obtained; the device is also simple to operate, all the data is transmitted to the computer when the device is used for testing, and automatic collecting is achieved; by the device and method, the shearing strength and shearing property of the natural rock crack faces can be measured, and the mechanical conditions, displacement features and the like of rock shear slide can be obtained from the shearing test result.

Description

technical field [0001] The invention relates to a portable rock shear strength testing device and method, belonging to the technical field of rock mechanics testing. Background technique [0002] The shear strength of rock is widely used in various geotechnical engineering fields. At present, when studying tight reservoirs, especially low-permeability shale gas reservoirs, it is very important to evaluate the influence of fracture shear strength of different reservoirs. Therefore, a device for testing the law of shear strength of shale natural fracture surfaces is very necessary in this field, which can explore the conditions of shear slip and provide a theoretical basis for engineering applications. [0003] Currently, the shear strength can be determined by the direct shear method. After the rock sample is processed, the friction surface of the shearing slide is manually polished until it is smooth and flat, and then placed in the upper and lower test boxes to ensure tha...

Claims

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Application Information

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IPC IPC(8): G01N3/24G01N1/28G01N1/34
CPCG01N1/286G01N1/34G01N3/24G01N2001/2873G01N2203/0025
Inventor 杨威肖剑波葛洪魁姜振学宋岩刘冬冬左如斯王乾右
Owner CHINA UNIV OF PETROLEUM (BEIJING)