Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shanxi mining area

Abstract

A coal mine in the northern region of Shaanxi Province, China, there is a facing-mining excavating roadway, to make the facing-mining excavating roadway to be retained for the next working face safety services. In this paper, the deformation and damage characteristics of the surrounding rock of the roadway in different periods are investigated by using FLAC 3D numerical simulation with the facing-mining excavating Roadway of this coal mine as the research background. At 20m ahead of the working face, a discontinuous plastic zone appeared in the surrounding rock of the roadway, and this phenomenon is a plastic zone jumping through due to the different hardness of the lithology. Real-time monitoring of the stability of the roadway is carried out using on-site measurement, and the roadway is affected by a large amount of mining in the 50m point of the working face in front of the roadway. Based on the numerical simulation and on-site monitoring results, the support strength was increased at 50m of the roadway over the working face, and a new support program was adopted. In the lagging section of the roadway, where the mine pressure is strongly manifested, anchor rods and anchor ropes with W steel belts are used to carry out differentiated reinforcing support, and the on-site effect is good.