超大采高工作面覆岩断裂结构及稳定性控制技术  

Overlying strata fracture structure and stability control technology for ultra large mining height working face

作　　者：庞义辉[1,2] 王国法 张金虎[1] 刘化立 

机构地区：[1]煤炭科学研究总院开采研究分院,北京100013 [2]煤炭开采水资源保护与利用国家重点实验室,北京102211 [3]陕西未来能源化工有限公司金鸡滩煤矿,陕西榆林719000

出　　处：《煤炭科学技术》2017年第11期45-50,共6页Coal Science and Technology

基　　金：国家重点研发计划资助项目(2017YFC060305);国家自然科学基金重点资助项目(U1610251);青年创新基金资助项目(2016QN007)

摘　　要：针对超大采高工作面超大空间、强扰动岩层运动带来的围岩稳定性控制难题,以金鸡滩煤矿8.0 m大采高开采实践为基础,采用理论分析、数值模拟等方法分析了超大采高工作面顶板岩层破坏的应力路径效应,提出了超大采高工作面顶板岩层断裂的"悬臂梁+砌体梁"结构及稳定性控制技术,并进行了超大采高工作面矿山压力实测分析。研究结果表明,不同层位顶板岩层的峰值应力、差应力及强度-应力比存在较大差异,直接影响顶板岩层的断裂状态及破断结构形式。金鸡滩煤矿8 m大采高工作面顶板岩层易形成"悬臂梁+砌体梁"结构,通过开发ZY21000/38/82D型超大采高液压支架、提高液压支架的强度及支架与围岩的组合刚度,实现了8 m大采高工作面的安全高效开采。According to the surrounding rock stability control problems of ultra large mining height working face from super-large space and strong perturbation of rock formation,the roof damage stress path effect of ultra large mining height working face was analyzed by theoretical analysis and numerical modeling method based on the mining practice of Jinjitan Mine with 8 m ultra large mining height working face. The＂cantilever beam ＋ voussoir beam＂fracture structure of roof and surrounding rock stability control technology were put forward for ultra large mining height working face. The mine ground pressure was measured and analysis for ultra large mining height working face. The results showed that the peak stress,differential stress and strength-stress ratio of sandstone in different horizons had very great difference,which influenced the roof fracture state and fracture structure form directly. The roof strata were easily form ＂cantilever beam ＋ voussoir beam＂fracture structure of 8 m large mining height working face in Jinjitan Mine. Through developing ZY21000/38/82 D hydraulic support,improving the strength of hydraulic and the composite stiffness between hydraulic support and rock,the safety,efficiency and high exploitation rate were realized in 8 m large mining height working face of Jinjitan Mine.

关 键 词：超大采高工作面 顶板断裂结构 围岩稳定性控制 矿山压力 

分 类 号：TD323[矿业工程—矿井建设]