System for testing propagation characteristics of planar two-dimensional stress waves before and after passing through joints

Abstract

The invention discloses a system for testing propagation characteristics of planar two-dimensional stress waves before and after passing through joints. The system comprises a loading system, a loading system, a joint simulation system, a heating device and a measuring system. The joint simulation system is placed on the loading system, a lateral pendulum bob in the loading system directly faces the side surface of a rock sample flat plate in the joint simulation system and is used for applying an impact load to the rock sample flat plate, the heating device can heat the rock sample flat plate, and the measuring system can measure the strain at the measuring points of the two rock sample flat plates before and after jointing. A result obtained through an experiment is more practical than a result obtained through numerical simulation, and the propagation size and direction of a planar two-dimensional stress wave passing through a point after heating and cooling are measured by a method of pasting a plurality of direction strain gauges on the same measurement point. Full-field strain information of a joint simulation system in the high-temperature process is recorded through the DIC technology, strain information of all points is decomposed, and then the propagation characteristics of planar two-dimensional stress waves before and after passing through joints are measured.

Description

technical field [0001] The invention relates to a test system for the propagation characteristics of a plane two-dimensional stress wave before and after passing through a joint, and belongs to the technical field of rock and soil mechanics tests. Background technique [0002] With the continuous development of economic construction, the engineering projects of underground space development and underground energy mining are increasing. During the construction process, safety accidents caused by stress waves generated by earthquakes, rockbursts, blasting, etc. have become a major problem in underground engineering, so it is necessary to study the propagation characteristics of stress waves. The current research shows that the joint surface in the rock mass is the key to the study of stress wave propagation. When the stress wave passes through the joints, a series of complex transmission and reflection phenomena will occur, forming reflected longitudinal waves, reflected trans...

AI Technical Summary

Problems solved by technology

The propagation of stress waves in the natural environment is multi-dimensional, but most of the current experimental research on stress waves focuses on the one-dimensional case, discussing the propagation characteristics of longitudinal waves in one-dimensional rock poles, and the research on the propagation characteristics of two-dimensional stress waves is more difficult. Solving the problem of two-dimensional stress wave propagation in rock mass can provide a theoretical basis for studying the propagation characteristics of stress waves in higher dimensions, and has a good effect on preventing accidents in the development of underground space and energy extraction. Engineering significance

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