覆岩主关键层断裂规律研究  

Research on Breaking Rule of Primary Key Overburden Stratum

作　　者：郭晓强[1,2] 窦林名[1,2] 陆菜平[1,2] 何江[1,2] 吕长国[1,2] 刘彪[1,2] 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221008 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221008

出　　处：《矿业安全与环保》2011年第1期23-26,6,共4页Mining Safety & Environmental Protection

基　　金：国家重点基础研究发展计划(973计划)项目(2010CB226805);国家自然科学基金资助项目(50490273)

摘　　要：覆岩主关键层断裂显著影响采场矿山压力显现,对其规律进行研究具有重要的意义。根据矿井地质条件和地表沉陷特征,建立了主关键层四边固支板状结构模型,利用纳维叶法求解其应力分布状态,给出相应的力学计算公式,并结合工程实际得出其极限尺寸,分析了此时的工作面支架工作阻力。研究结果表明:主关键层边缘长边中点处开始张性断裂,继而短边中点断裂,符合"O—X"型断裂形式;通过工作面支架工作阻力实测验证了理论计算的准确性,长边破裂时上、下部工作阻力上升,继而短边破裂时中部工作阻力上升。The breaking of primary key overburden stratum has significant effects on the mining pressure of stope, so it is of great significance to the research on its rules. In this paper, a clamped plate structure model for the primary key stratum was established according to the geological conditions and characteristics of surface subsidence, the stress distribution was solved with Navier solution, and corresponding mechanical formulas were given. Also the limit size was obtained according to the practical engineering and the working resistance of supports in the working face was analized. The research results showed that the primary key stratum came to tensile fracture from the long side of the edge at the beginning, followed by the short side and in line with 'O-X' mode. Through real-time monitoring of the working resistance of supports, the accuracy of theoretical calculation was verified. When the long side became fractured, the upper and lower parts of the working resistance rised, followed by the central part when the short side became fractured. The research results have a certain theoretical significance and reference value to the stratum control theory and the mine safety.

关 键 词：采矿工程 关键层 纳维叶解法 张性断裂 矿山压力 

分 类 号：TD325[矿业工程—矿井建设]