Device for exerting transient pressure relief stress waves in large-scale similar experiment system

Abstract

The invention discloses a device for exerting transient pressure relief stress waves in a large-scale similar experiment system. The device comprises a test table and a falling hammer, wherein the top end of the test table is provided with two mutually parallel guide posts; the falling hammer can vertically slide along the two guide posts; a first pressure bearing post and a second pressure bearing post are arranged between the two guide posts; the second pressure bearing post is arranged at the top end of the first pressure bearing post; the initial position of the falling hammer is positioned on the top end of the second pressure bearing post after the first pressure bearing post and the second pressure bearing post are stacked; a plurality of position limiting blocks used for preventing the falling hammer from downwards sliding are formed on each guide post; the height of each position limiting block is identical; in addition, the distance from the top end surface of each position limiting block to the bottom end surface of the falling hammer is smaller than the distance from the top end surface of the first pressure bearing post to the bottom end surface of the falling hammer. The device has the advantages that the transient pressure relief stress waves generated in the excavation process of engineering such as large-scale undersea tunnels and deep coal roadways can be simulated; the problem of low load pressure relief speed of the existing experiment is solved.

Description

technical field [0001] The invention belongs to the technical field of similar simulation tests, in particular to a device for imposing transient decompression stress waves in a large-scale similar test system. Background technique [0002] In recent years, during the excavation process of many large-scale subsea tunnels and deep mine roadways, etc., they are faced with the challenge of rock mass damage in deep high-stress states and the increase in the number of rockburst dynamic disasters. However, due to the limitation of experimental conditions, it is impossible to realize Experiments on the physical and mechanical properties of rock mass. For this reason, some scholars have turned their research on rock mechanics problems such as multiphase coupling and static and dynamic integration to numerical simulation analysis, but there is a lack of devices for imposing transient decompression stress waves in large-scale similar experimental systems. [0003] From the nature of ...

AI Technical Summary

Problems solved by technology

However, the current research in the laboratory is still at the stage of low pressure relief rate, and it is difficult to apply a transient pressure relief shock wave to the specimen, so the experimental data obtained during this type of experiment are different from the actual situation.

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