Roadway impact resistance calculation method considering support-pressure relief-surrounding rock coupling effect

Abstract

The roadway impact resistance calculation method considering the support-pressure relief-surrounding rock coupling effect comprises steps of the corresponding test piece strength being determined according to the roadway surrounding rock strength grade, and the top plate support grade and the test piece type being determined by using the support parameters of the top plate; comprehensively considering support parameters and pressure relief parameters of two sides of the roadway, and determining test piece types of the two sides; determining an anchoring position according to the type of a top plate test piece, determining the anchoring position and a hole adding position according to the types of two side test pieces, and manufacturing a test piece meeting the requirements; performing a dynamic impact test and test piece energy calculation on the test piece, performing indoor test piece manufacturing and testing according to field engineering conditions, and calculating anchoring surrounding rock bearing energy of unit volume of two sides and a roof according to a stress-strain curve obtained by the test; finally, a calculation result being converted into field engineering for energy calculation of the roadway anchoring bearing structure.

Description

technical field [0001] The invention relates to a roadway anti-shock calculation method considering the coupling effect of support-pressure relief-surrounding rock. Background technique [0002] In recent years, with the increasing depth and intensity of coal mine mining in my country, the distribution range and quantity of rock burst mines have become larger and larger, and the occurrence frequency and damage degree of rock burst have become more intense, often causing equipment damage and casualties. Pressure disasters have become the main disasters restricting the safe, high-yield and efficient mining of coal mines. According to statistics, 90% of rock burst disasters occur in roadways, and reasonable anti-scour measures for roadways can effectively reduce or avoid damage caused by rock bursts. Support and pressure relief for large diameter boreholes. Under the conditions of strengthened support and large-diameter pressure relief, the impact resistance value is a compreh...

AI Technical Summary

Problems solved by technology

The roadway resists the impact ground pressure in the form of a whole, not the result of the independent action of the roof or the side; The capacity calculation method cannot fully reflect the actual impact resistance of the roadway

[0006] (2) The coupling effect between the support structure and the surrounding rock is not considered

The support structure and the surrounding rock form a unified anchor bearing body, which will produce displacement and deformation after being subjected to the impact load together. actual

[0007] (3) The pressure relief effect is not considered

In rock burst roadways, large-diameter borehole pressure relief has become a customary measure, which has an important influence on the calculation of the impact resistance of anchorage bearing structures and is a factor that must be considered. None of the existing calculation methods for impact resistance Consider the role of pressure relief holes

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