中国矿山工程

A mine in Southwest China is a soft coal seam, the mining face is a comprehensive release working face, the roadway leaves the top coal, and the dynamic pressure generated by the release of the top leads to serious deformation of the surrounding rock of the adjacent tunneling roadway. In view of the above problems, the multi-field coupling simulation software was used to simulate the strain evolution law of the surrounding rock under the influence of dynamic pressure, and combined with the comprehensive analysis of the on-site observation data of the off-loading instrument, it is known that the original support measures have the danger of surrounding rock instability under the influence of the dynamic pressure, and the reasons leading to the instability of the surrounding rock are analyzed, and preventive and curative measures are formulated. Through the construction of pressure relief holes to control the spread of dynamic pressure to the support area, U-beam steel + pipe shed support to improve the overall support strength. After the implementation of preventive measures, the maximum displacement of the tunnel perimeter rock affected by dynamic pressure was 50mm, and the overall deformation was relatively small. The preventive measures effectively control the problem of insufficient support strength of the soft coal roadway under the influence of dynamic pressure.