Testing device and method for simulating deep rock mass impact failure

Abstract

The invention discloses a testing device and method for simulating deep rock mass impact failure. The testing device comprises an impact mechanism and a confining pressure loading mechanism, wherein the impact mechanism comprises a gas gun tube, a sabot and a flyer, the confining pressure loading mechanism comprises a confining pressure cylinder body, a through hole is formed in the middle part of a cover of the confining pressure cylinder body, two confining pressure testing sensors are arranged on the inner wall of each semicircular cylinder body of the confining pressure cylinder body, a blocking piece vertical to the axial line of the confining pressure cylinder body is arranged in the confining pressure cylinder body, a sample to be tested is clamped between the blocking piece and the cylinder bottom, a hoop is sleeved at the outer wall of the cylinder body, a conducting wire hole and a grouting hole for injecting an expansive cement mixture are formed in the cylinder bottom, and the expansive cement mixture is composed of expansive cement, water and iron sand or expansive cement, water and rubber powder. The method comprises the steps of assembling the testing device, debugging the assembled device, and impacting the blocking piece through the flyer. According to the invention, the proportions of the raw materials of the expansive cement mixture are adjusted to simulate the environment of deep rock mass, and the testing device has the advantages of high safety, good sealing property, stable confining pressure load, convenience and quickness for operating, and the like.

Description

technical field [0001] The invention relates to a test device and method for simulating impact damage of deep rock mass. Background technique [0002] In the construction of underground engineering, blasting, tunnel boring machine excavation and percussion drilling can be used to break rock. Rock breaking speed and efficiency are greatly reduced. The impact failure behavior of deep rock mass is closely related to its mechanical environment. Using the model test method to study the impact failure behavior of deep rock mass has positive significance for understanding its rock breaking effect. [0003] At present, in the impact test of rock mass, there are many ways to load the confining pressure of the rock mass sample, for example, the oil pressure loading device is used in the impact test of the Hopkinson pressure bar. Among them, the test system of Hopkinson pressure bar and oil pressure loading device is the most widely used. The confining pressure device generally used ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects of large experimental errors, low impact loading rate and difficulty in simulating the failure of rock mass in a higher strain rate range due to the use of triaxial Hopkinson compression bars in the prior art, as well as complex structures and difficulties in disassembly and assembly To solve the problem, the present invention provides a test device and method for simulating the impact damage of deep rock mass. The test device has the characteristics of high safety performance, good sealing performance of the air chamber of the gas gun in the impact mechanism and stable confining pressure load. The method is simple, safe and reliable

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