System for testing rough fissure surface shear slip dynamic stress field under action of dynamic load

Abstract

The invention relates to a system for testing a rough fissure surface shear slip dynamic stress field under the action of dynamic load. The system comprises a test model vertical loading system, an optical experiment system, a horizontal light-gas gun impact system and a digital signal control system, wherein the test model vertical loading system is used for applying vertical load to a test modeland controlling impact slip guide; a rough fissure surface is embedded into the test model; the optical experiment system is used for capturing a photoelastic stripe image of the test model in a rough fissure surface shear slip process; the horizontal light-gas gun impact system is used for applying dynamic stress wave action to the test model through a mode of emitting pills with a preset impactspeed value to the test model; and the digital signal control system is used for controlling synergistic work of the optical experiment system, the horizontal light-gas gun impact system and the testmodel vertical loading system, and is also used for controlling synchronization of pulse laser emission and high-speed camera shooting when the tested model is impacted by the pills. Transparent display of the fissure surface shear slip dynamic stress field is realized, and the law that the dynamic stress wave is spread along the rough fissure surface and the shear slip dynamic stress field is evolved can be transparently displayed and quantitatively represented.

Description

technical field [0001] The invention relates to the technical field of dynamic stress field measurement, in particular to a dynamic stress field test system for shear slipping of a rough crack surface under the action of a dynamic load. Background technique [0002] Coal mining is generally carried out underground, and underground mining activities in coal mines will inevitably lead to the development of cracks in the surrounding rock of the roadway. Significant changes affect the stability of the roadway surrounding rock and roadway support structure. At the same time, due to the certain roughness of the natural fracture surface, by studying the evolution law of the dynamic stress field of the shear slip of the rough fracture surface under the action of the stress wave, the law of the slip and rupture of the rough fracture surface under the action of the stress wave and the propagation and attenuation of the stress wave can be quantitatively characterized. Therefore, it pr...

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Problems solved by technology

[0003] Traditional experimental research mainly focuses on the qualitative description of the stress field evolution law and stress wave propagation process of faults, joints, and fracture surfaces under the action of stress waves. So far, there is no experimental method to transparently display and quantitatively characterize dynamic stress waves along the rough surface. Crack Surface Propagation and Shear Slip Dynamic Stress Field Evolution

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