A device for imposing transient decompression stress waves in a large-scale similar experimental system

Abstract

The invention discloses a device for imposing transient pressure relief stress waves in a large-scale similar experiment system, which includes a test bench and a drop weight. Two guide columns parallel to each other are arranged on the top of the test bench, and the drop weight can move along the two guide columns. Sliding up and down, the first pressure-bearing column and the second pressure-bearing column are set between the two guide columns, the second pressure-bearing column is placed on the top of the first pressure-bearing column, and the initial position of the drop hammer is located at the first and second bearing columns. After the pressure columns are stacked, on the top of the second pressure-bearing column, the two guide columns are provided with a plurality of limit blocks for preventing the falling weight from sliding down. The height of each limit block is the same, and each limit block The distance from the top surface of the block to the bottom end surface of the drop hammer is smaller than the distance from the top surface of the first pressure-bearing column to the bottom end surface of the drop hammer. The invention can simulate the transient decompression stress wave produced in the excavation process of large-scale subsea tunnels, deep mine roadways and other projects, and solves the problem that the existing tests still remain at a low decompression load rate.

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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