Study on Deformation Law of Overlying Roadway Under Condition of Lower Protective Seam Mining

In order to study the influence law of overlying roadway caused by lower protective seam mining, take the Liuxibeier Roadway of No.3 coal seam of Guo zhuang Mine as research object, the deformation of surrounding rock was measured. The results showed that the Liuxibeier Roadway was influenced by the No. 9 coal seam extraction under the specified condition of lower protective seam mining. According to the degree of roadway affected, roadway could be divided into three area d uring the mining period: initial influence area, intense influence area, post-mining influence area. The real deformation law of the roadway was in general accord with th e deep deformation law of the roadway. The largest deformation rate area was located in the range of 13- 20 m from the mining face. The damage depth of the roadwa y floor was about 7 ~ 8 m, and the degree of damage was worse with the shallow depth, the whole settlement amount of overlying coal roadway was comparatively larg e, and the accumulative covergence was about 1. 1 ~ 1. 4 m. The results would provide scientific basis for support and reinforcement of overlying coal roadway under t he similar condition.