Study On Distortion Mechanism Of Main Roadway Surrounding Rock Under The Dynamic Pressure And The Release Of Pressure Control

Based on the characteristic and rule of the roadway and chamber surrounding rock stress distribution under the dynamic pressure influence, Multi-research methods, such as the theoretical analysis, the computer numerical simulation and the field research were synthetically used in this paper. It processed the systemic research to the surrounding rock stress distribution, the distortion rule, the influence factor and the technology of reducing pressure. The stress distribution characteristics and the distortion rules and the general technical parameters of reducing pressure were found. The front abutment pressure transmitted angle was 65°under the dynamic pressure influence. The floor roadway experienced three pressure processes, such as the tranquilization, the hoist and the release of pressure. The primary cause of roadway distortion was that the surrounding rock was affected by the vertical stress and shear stress function. It could control the tunnel dynamic roadway distortion to retain the reasonable protection coal pillar and become less crowded demolition. The relaxation blasting could transfer the surrounding rock centralized stress to the depth rock, reduce the surrounding stress and protect roadway. The relaxation blasting could obtain the effective control of roadway surrounding rock distortion and reduce the coal loss rate. This article research results has certain guiding sense and the reference value to repair or protect the roadway under the dynamic pressure influence.