A Rigid True Triaxial Specimen Elastic Box Fixture and Rock Sample Displacement Monitoring Method

Abstract

The application discloses a rigid true triaxial test piece elastic box fixture and a rock sample displacement monitoring method, belonging to the technical field of rock mechanics laboratory tests. The fixture is mainly composed of 6 pressing plates and 8 leaf springs, and the whole constitutes an elastic pressure One side of the elastic pressure box can be disassembled, which greatly reduces the operation steps of rock sample installation and saves the installation time. The spring connected to the pressure plate can not only ensure the stability of the fixture, but also can be used for the true triaxial single-sided unloading test of the rock sample. It does not affect the stress state of other surfaces of the rock sample, which ensures the accuracy of the test. The invention also provides a method for monitoring the displacement of rock samples by using an elastic box clamp. In the method, six displacement sensors are added to the elastic box clamp, and two displacement sensors are installed in each axis direction, which can be used for true three-axis measurement. The displacement of the rock sample is monitored in real time during the rigid loading test.

Description

technical field [0001] The invention relates to the technical field of rock mechanics laboratory tests, in particular to an elastic box fixture for a rigid true triaxial test piece and a rock sample displacement monitoring method. Background technique [0002] Transportation, water conservancy and hydropower, metal mines, physical underground laboratories, national defense, oil and gas, nuclear waste underground storage and other projects continue to go deep, and the buried depth and ground stress are increasing day by day. Today, the development and utilization of underground space is an inevitable requirement for the development of urbanization; digging deep into resources is a strategic choice for sustainable development; deep underground burial of high-level radioactive waste, mastering the changes in the deep state of the earth, and early warning of natural disasters and other specific requirements, Promoted our country to issue the "March into the Deep Earth" command. ...

AI Technical Summary

Problems solved by technology

The rigid loading surface of the rigid-flexible composite loading fixture specimen is wrapped by rigid pads, and the flexible loading surface needs to be coated with sealant. The operation process is cumbersome, and the uniformity of the sealant will also have a certain impact on the test results, which cannot meet the six-sided rigid loading. The testing machine cannot realize quick unloading of one-way or two-way principal stress, and rockburst test research cannot be realized; the rigid fixture is generally a sliding fixture, and the two sliding blocks are mutually restricted. If the stress state of one surface is changed and the Adjacent surfaces will also be affected, which cannot meet the requirements for hard rock true triaxial tests and related tests that require true triaxial single-sided unloading conditions

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