Preparation and sealing method of crack-containing rock sample for multi-field coupling triaxial test

Abstract

The invention discloses a preparation and sealing method of a crack-containing rock sample suitable for a multi-field coupling triaxial test. The method comprises the following steps: preparing a complete rock sample; processing rock sample cracks; carrying out water saturation treatment on the crack-containing rock sample; sealing the crack-containing rock sample. By applying the method, cracks can be prefabricated on natural rock, the lengths, the widths and the angles of the cracks are controllable, meanwhile, the problem that confining pressure oil and high-pressure water break through a heat shrink tube at the prefabricated cracks in a multi-field coupling triaxial test to cause sealing failure is also solved, in addition, water pressure can directly act on the cracks in the rock sample, technical support is provided for researching the influence of high-pressure water seepage on crack propagation, and it is possible to simulate the hydraulic mechanical property of crack-containing rock under the condition of real geological environment complex condition thermal hydraulic multi-field coupling through experiments.

Description

technical field [0001] The invention belongs to the technical field of rock simulation tests, and in particular relates to a method for preparing and sealing rock samples containing cracks for multi-field coupled triaxial tests. Background technique [0002] Joints and fissures in underground engineering rock mass are usually mechanically weak surfaces, which are easy to expand and fail under construction disturbance, and are more dangerous when groundwater exists in them. The expansion law of the rock sample is of great significance for engineering design and construction. However, in the triaxial test that can simulate the multi-field coupling environment, the external confining pressure oil and internal high-pressure seepage fluid of the rock sample are easy to break down the heat-shrinkable tube at the prefabricated crack, thereby destroying the For this reason, existing studies mostly use resin, gypsum, cement mortar and other similar materials to prefabricate rock-like...

AI Technical Summary

Problems solved by technology

[0002] Joints and fissures in underground engineering rock mass are usually mechanically weak surfaces, which are easy to expand and fail under construction disturbance, and are more dangerous when groundwater exists in them. The expansion law of the rock sample is of great significance for engineering design and construction. However, in the triaxial test that can simulate the multi-field coupling environment, the external confining pressure oil and internal high-pressure seepage fluid of the rock sample are easy to break down the heat-shrinkable tube at the prefabricated crack, thereby destroying the For this reason, existing studies mostly use resin, gypsum, cement mortar and other similar materials to prefabricate rock-like samples with internal cracks. There is currently no multi-field coupling triaxial test for natural rocks with cracks, and rock-like samples cannot Comprehensively reflect the hydraulic, mechanical properties and damage and failure laws of natural rocks, and it is difficult for the seepage hydraulic pressure to directly act on the internal cracks of the sample in the triaxial test, so it is impossible to study the effect of the seepage hydraulic pressure on the crack propagation

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