Experimental method by simulating roadway crossed strain rock burst

Abstract

The invention provides an experimental method by simulating roadway crossed point strain rock burst. The experimental method comprises the steps of: providing a cuboid or cube rock sample test piece,loading three-directional initial stress onto six surfaces of the rock sample test piece, and keeping for 5-10 min; and, suddenly unloading the load acting on two opposite surfaces of the rock sampletest piece, so that the two opposite surfaces of the rock sample test piece form a free face, simulating the excavation unloading effect of a roadway crossed point rock body, observing the state of the rock sample test piece: if the rock sample test piece has rock burst damage, ending the experiment; and, if the rock sample test piece does not have rock burst damage, increasing the vertical direction stress value in two unloaded stresses till the rock sample test piece has rock burst damage. Experimental equipment used by the experimental method provided by the invention is true tri-axial rockburst experimental equipment capable of realizing rapid unloading two surfaces or multiple surfaces in the horizontal direction under a high-pressure state; and strain rock burst of a rock body at aroadway crossed point can be well simulated in the invention.

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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