High-temperature triaxial rheological and dynamic and static combined loading test device for coal and rock mass

Abstract

The invention belongs to the technical field of rock mechanics and engineering, and particularly relates to a high-temperature triaxial rheological and dynamic and static combined loading test devicefor coal and rock mass. According to the device, servo loading control is adopted for axial loading, loading of different levels and different strain rates in the axial direction is achieved by controlling the loading mode and the loading rate, and long-time stable pressure maintaining can be achieved; pore water pressure is applied to a test piece by adopting a high-precision confining pressure tracking pump; a plurality of uniformly distributed displacement sensors are adopted to indirectly measure the radial strain of the test piece by measuring the radial deformation of a plurality of points on the circumference of the test piece; according to the invention, the problem that the deformation of a triaxial rheological test sample taking water as a confining pressure medium cannot be measured can be solved, uniaxial and triaxial tests of the coal and rock mass under the conditions of different temperatures, confining pressures and loading rates can be carried out, and the deformationand damage conditions and damage and failure conditions of the sample in the test process can be accurately measured; and the device has the characteristics of stable measurement and control system, high measurement precision, good voltage stabilization effect and the like.

Description

technical field [0001] The invention belongs to the field of rock mechanics and engineering technology, and specifically relates to a high-temperature triaxial rheological and dynamic-static combined loading test device for coal and rock mass. Background technique [0002] With the gradual popularization and application of residual coal re-mining technology, the coal resources left over from the old mining system in the last century are gradually being mined and utilized. Most of these coal resources exist in the form of coal pillars, which are called residual coal pillars. The residual mining coal pillars have been in the complex environment of depleted water, ground pressure, and ground temperature for a long time, showing obvious rheological characteristics, and the residual mining coal pillars have different degrees of deformation and damage. Under the disturbance of face mining dynamic pressure, the deformation and damage of residual mining coal pillars increased signif...

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Problems solved by technology

[0007] The present invention overcomes the deficiencies of the prior art, and proposes a high-temperature triaxial rheological and dynamic-static combined loading test device for coal and rock mass, which solves the technical problem that the existing triaxial rheological testing machine cannot measure radial deformation in water

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