Control Technology of Roadway Surrounding Rock with Strong Dynamic Pressure and High Horizontal Stress

To solve the problem of strong dynamic and high horizontal stress about roadway support, based on in-situ stress test, roof coring detection, in-situ strength test of rock mass and FLAC^3D numerical simulation, the failure mechanism of roadway under the action of high horizontal stress under strong dynamic pressure was studied, and then the high prestress strong support technology was applied for roadway support, and field test and mine pressure monitoring were conducted. The results showed that: intensely dynamic and high horizontal pressure leads to the gradual shear failure of the two sides of the roadway from shallow to deep, the decrease of the bearing capacity leads to the instability of the roof; intensely dynamic and high horizontal pressure aggravats roof shear dislocation, which leads to the unstability of roof anchorage structure and roof was loose breakage finally; the idea of “roadsides reinforcement and roof control” was proposed, which used combined support scheme of “anchor + beam + net” to reinforce two roadsides and control roof. Compared with the original support, the surface displacement was reduced obviously and the control effect of surrounding rock was remarkable.