Method for acquiring dynamic stiffness of rock joint

A technology of dynamic stiffness and rock joints, applied in the direction of strength characteristics, using stable tension/pressure testing material strength, measuring devices, etc. The effect of simplifying the test process, solving the problem of difficult determination and improving the measurement accuracy

Pending Publication Date: 2021-09-24
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

However, the field test method has many influencing factors, the test conditions are not easy to control, the process is complicated, and the reliability and accuracy of the results are poor.
[0003] In laboratory tests, the compression and direct shear tests of intact rocks and jointed rocks are carried out separately, and the test data of intact samples and jointed samples are com

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  • Method for acquiring dynamic stiffness of rock joint
  • Method for acquiring dynamic stiffness of rock joint
  • Method for acquiring dynamic stiffness of rock joint

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Embodiment Construction

[0023] An embodiment of the present invention provides a method for indoor acquisition of dynamic stiffness of rock joints under earthquake action, the method includes the following process:

[0024] It should be noted that the joints in this embodiment, also called fissures, are small fracture structures in which the rock blocks on both sides have no significant displacement after the rock mass is fractured by force. Joints are very common structural geological phenomena, which are the cracks we see on rock outcrops, or cracks in rocks.

[0025] 1. Prepare a cuboid rock sample with penetrating joints.

[0026] First, according to the seismic wave propagation direction and joint inclination, the ratio of normal stress to tangential stress on the joint surface is about 0.87.

[0027] Assuming the included angle θ between the loading direction of the rock sample and the normal direction of the internal joint surface, see figure 1 As shown, under the uniaxial compression condit...

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Abstract

The invention relates to a method for acquiring the dynamic stiffness of a rock joint, and belongs to the technical field of rock mass measurement. The method comprises the following steps: preparing a rock sample containing the joint, carrying out a uniaxial compression test on the rock sample, and determining an equivalent normal stress sigma n and an equivalent tangential stress sigma t on a plane where the joint is located according to an applied compression external load sigma 0; shooting an image of the rock in the compression process, and determining a displacement field and a strain field in the rock test process according to the shot image; determining the thickness of the joint according to the strain field, selecting a plurality of characteristic sections in the length direction of the joint, determining displacements of upper and lower edge measuring points of the characteristic sections, and determining an average normal displacement un and an average tangential displacement ut on a plane where the joint is located; and determining the dynamic normal and tangential stiffness of the joint according to a joint stiffness calculation formula.

Description

technical field [0001] The invention belongs to the technical field of rock mass measurement, and in particular relates to a method for acquiring dynamic stiffness of rock joints. Background technique [0002] Joints widely exist in rock mass, and rock joint stiffness is one of the important parameters to characterize the mechanical properties of joints. At present, the joint stiffness is mainly obtained through field test and indoor test. The field test monitors the vibration waveforms on both sides of the joint through artificial vibration, and calculates the joint stiffness according to the vibration waveform and related assumptions. However, the field test method has many influencing factors, the test conditions are not easy to control, the process is complicated, and the reliability and accuracy of the results are poor. [0003] In laboratory tests, the compression and direct shear tests of intact rocks and jointed rocks are carried out separately, and the test data o...

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Application Information

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IPC IPC(8): G01N3/08G01N3/06G01B11/16
CPCG01N3/08G01N3/068G01B11/16G01N2203/0003G01N2203/0019G01N2203/0075G01N2203/0252G01N2203/0647
Inventor 赵武胜陈卫忠解佩瑶杨典森谭贤君
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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