Experimental method for simulating roadway cross-strain rockburst

Abstract

The application provides an experimental method for simulating strain rockburst at roadway intersections, comprising: providing a cuboid or cube-shaped rock sample, loading three-dimensional initial stress on six faces of the rock sample, and maintaining 5- 10 minutes. The load acting on the two opposite surfaces of the rock sample is suddenly unloaded, so that the two opposite surfaces of the rock sample form a free surface, and the excavation and unloading effect of the rock mass at the intersection of the roadway is simulated, and the rock sample is observed state: if rockburst damage occurs to the rock sample, the experiment ends; if no rockburst damage occurs to the rock sample, the vertical stress value of the two stresses that have not been unloaded is increased until the rock sample Rockburst damage occurs. The experimental equipment used in the experimental method provided by this application is a true triaxial rockburst experimental equipment that can realize rapid unloading under high pressure on two or more horizontal surfaces. The application can well simulate the strain rockburst of the rock mass at the roadway intersection.

Description

technical field [0001] The application relates to the field of rock mass mechanics and geotechnical engineering research in deep mine engineering, and in particular to an experimental method for simulating strained rockbursts at roadway intersections. Background technique [0002] With the development of underground engineering to the deep, the problem of rockburst has become increasingly prominent and has become an important factor restricting the development of deep underground engineering. On-site rockburst research is extremely difficult due to its suddenness and huge energy release, so indoor experiments have become the main means of rockburst research. At present, the rockburst experiments are single-sided unloading rockburst experiments. The single-sided unloading rockburst experiment only simulates the situation of roadway rockburst with only one free face. However, there are still a large number of complex underground engineering. At the roadway intersection of two...

AI Technical Summary

Problems solved by technology

At present, the rockburst experiments are single-sided unloading rockburst experiments. The single-sided unloading rockburst experiment only simulates the situation of roadway rockburst with only one free face. However, there are still a large number of complex underground engineering. At the roadway intersection of two free faces, and there are two free faces, the stress concentration phenomenon is more obvious, and the rockburst problem is more likely to occur

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