The Study Of Ruptured Roadway Surrounding Rock Instability And The Safety Control Technology When Ascending Mining

In recent years, with the development of China’s economy, the consumption of coal has increased in the past few years for it’s the main energy in China.Along with the exploitation of coal increased year by year, and with our country most of the old mining area of shallow buried coal seam of depletion, the depth of the mine production increased year by year, and adopt deep increases mean stress increases at the same time by the coal mine gas control the number of coal increased coal mining tends to bad. The domestic and foreign universal use of mining protective layer to the liberation of protected coal seam, in order to adapt to the increasingly complicated mine gas problems, and to solve the problem of gas outburst coal seam mining. But by the original setting of upper roadway supporting problem put forward higher request for using the method of ascending mining, protective layer roof rock will be affected to a certain extent.This study on the basis of the five mining area of Huaibei in Zhuxianzhuang Coal Mine II protection layer mining the actual situation, respectively from the following issues of ascending mining in the upper mining influence the rupture of surrounding rock losing steady mechanism and safety support measures. By theoretical analysis, determined surrounding rock of upper roadway loss of stability and the specific reasons for the process and analysis of the dynamic pressure roadway surrounding rock failure mechanism and stability of Roadway Influenced by factors, through the establishment of the mechanical model, according to the project actual calculated under protection layer mining influence scope. Adopt the similar simulation experiment in the lab, according to the proportion of construction model to simulate the excavation. According to the stress and displacement measuring line income data and model failure phenomenon, analysis summarized in ascending mining overlying strata and tunnel deformation and failure law of, stress field distribution. Using the FLAC numerical simulation software, simulation of 10 coal excavation process, analyzes 10 coal mining process in the upper part of the roadway surrounding rock deformation law and stress distribution law. Through the analysis of the above methods of roadway failure rules, according to the provided by roadway grouting, anchor fill strong, erecting the combined support supporting method of roadway reinforcement and maintenance of roadway stability, ensure the tunnel safety leave design and use, for future mine areas adjacent to the similar mining conditions provide a reference.