Deep borehole rock deformation testing device

Abstract

The present invention discloses a deep borehole rock body deformation testing device with hand hydraulic pump connected with a pressure gauge and a high-pressure oil tube; two high-pressure oil tube are respectively a load applying course oil tube and a return journey oil tube, the load applying course oil tube is connected to the course piston interface of the hole drilling rock body deformationtester; and the measuring cable is connected with the hole drilling rock body deformation tester and the digital number reading device. The hole drilling rock body deformation tester is composed of four pistons, three displacement transducers, a displacement transducer amplifier, two force measuring sensors, a force measuring sensor amplifier, a detachable active rigid bearing plate, a detachablepassive rigid bearing plate, a protective barrel and a circuit protecting barrel; the device has the advantages of high measuring precision, good coupling capacity to the hole drilling wall, directlymeasuring the deformation modulus value and elasticity modulus value of the deep rock body, simple structure, easy operation, stable testament and accurate data.

Description

technical field [0001] The invention relates to the technical field of rock mass engineering testing, and more particularly relates to a deep drilling rock mass deformation characteristic testing device. It is suitable for testing the deformation modulus and elastic modulus of rock masses with different drilling diameters (Φ75mm, Φ91mm, Φ110mm) and rock masses of different lithologies (soft rock and hard rock). Background technique [0002] The elastic modulus (deformation modulus) of rock mass is an important parameter in rock mass engineering design. At present, the testing methods for elastic modulus of engineering rock mass commonly used in the world can be generally classified into two categories: dynamic method and static method. The dynamic method is mainly to establish the relationship between the motion parameters and the elastic modulus of the rock mass by studying the propagation law of the seismic wave or sound wave in the rock mass. This test method has the ad...

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Problems solved by technology

However, due to the uniform pressure of the capsule during the test, the deformation of the pore wall is not evenly distributed along the pore diameter direction, but is distributed on a curved surface (large in the middle and small at both ends), the experimental results obtained by measuring the volume change of the capsule The deformation of the section rock mass does not reflect the maximum deformation capacity of the rock mass. Therefore, the test results are often too large and must be corrected to some extent.

At the same time, the flexible drilling rock mass deformation tester eliminates the parasitic expansion of the pipeline and the pressure pump system in the test results, but cannot eliminate the compression deformation of the expansion bladder during the pressurization process, and the test results include the expansion of the expansion capsule The amount of compression deformation affects the accuracy of the test results to a certain extent

In addition, for rock masses with obvious anisotropy, when it is necessary to know the elastic modulus in different directions of the rock mass, this instrument is obviously not applicable

[0007] At present, foreign rigid drilling rock mass deformation testers cannot meet the requirements mainly in the following aspects: (1) There are large errors in the test results, which need to be corrected according to the comparison test results and numerical analysis; (2) It is impossible for the hole wall to be fully coupled with the rigid bearing plate of the drilling rock mass deformation tester (the bearing plate is at a fixed contact angle of 90°), so that the rock mass is not uniformly stressed, and there is local stress concentration on the stressed surface; (3) During the test, the pressure block produces longitudinal bending; (4) The displacement sensor is installed at both ends, and the deformation of the rock mass obtained by the displacement sensor is obviously small, which affects the test results; The force sensor can not eliminate the influence of pressure conversion and pipeline loss on the test results, as well as the error caused by piston friction

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