中国矿山工程

It is difficult to control the creep deformation of high stress poor roadway in a copper mine and high maintenance cost. In order to reduce the cost of roadway support, this paper analyzes the deformation and failure characteristics of deep surrounding rock and the main influencing factors. Aiming at the problems of large deformation and high maintenance cost of shotcrete anchor+U shaped steel frame+anchor grouting (SUG) combined support, the combined support technology of shotcrete anchor+steel tube beam support+anchor grouting (SSG) is studied. Then, on the basis of determining the two supporting parameters, FLAC finite difference analysis software is used to carry out the numerical simulation of surrounding rock of SUG and SSG supporting roadway. The results show that the maximum deformation of SUG and SSG support rocks is 38.6mm and 25.7mm respectively, and the maximum deformation of latter is 33% lower than that of the former. Under the same conditions, the costs of SUG and SSG support and repair within two years of 50m roadway are 1.55 million yuan and 0.8 million yuan respectively, and the latter is 48% lower than the former. At last, the site test of SSG support was carried out in the bad strata in the 1000m middle section of mining area, and the deformation monitoring of supporting roadway is carried out for 3-5 years. The results show that SSG support roadway has good stability, strong security and high cost performance, which meets the requirements of creep deformation control of roadway in high stress poor strata, and has been popularized and applied in the construction of deep bad strata roadway in the copper mine.