A field coring device and method for rock true triaxial test

Abstract

The invention relates to an on-site coring device and method for a rock true triaxial test. The on-site coring device comprises a fixed framework, a cutting cylinder wall, a coring cylinder, a power system and a chain type cutting system, wherein the power system is arranged on the fixed framework, the chain type cutting system is arranged on the coring cylinder, the bottom end of the fixed framework is connected with the cutting cylinder wall and then is arranged on the coring cylinder, and the power system transfers power to the chain type cutting system, thus cutting rocks by the chain type cutting system. The device is simple in structure, convenient to disassemble, and easy to core in field, thus having extremely high popularization values.

Description

technical field [0001] The invention relates to the field of rock equipment, in particular to an on-site coring device and method for rock true triaxial tests. Background technique [0002] The true triaxial test is a triaxial compression test in which the rock specimen is placed in a stress combination state where the three principal stresses are unequal (ie σ1>σ2>σ3). True triaxial test can study the effect of intermediate principal stress (σ2) on rock deformation and strength characteristics. [0003] For tunnel construction, under the condition of high ground stress, the surrounding rock of underground engineering is in a three-dimensional stress state before excavation, and the principal stress in one or two directions is very high. After excavation, the surrounding rock changes from a three-dimensional stress state to a two-dimensional stress state. In the state of stress, when the rock is relatively brittle, it is possible to produce a sharp release of energy, ...

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Problems solved by technology

In addition, the excavation of surrounding caverns may cause the intensification of stress concentration in the surrounding rock of the excavated caverns, resulting in a sharp increase in the energy release rate of the surrounding rocks in the excavated caverns after a period of excavation, resulting in rockbursts, resulting in Therefore, it is of great research significance to fully understand the true triaxial mechanical properties of rocks to ensure the safety of tunnel construction and reduce the construction line

[0004] At present, the research on true triaxial test is still immature, and it is extremely difficult to take the coring of square specimens on site. The traditional coring device is too heavy, the cost of coring is high, and the sampling operation is cumbersome, which is difficult to meet the use of true triaxial test. Require

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