山丘地形下近浅埋煤层综采面静动载叠加的矿压显现特征研究  

Study on strata behavior characteristics of fully mechanized mining face at near shallow buried coal seam with superimposed static and dynamic loading in hill terrain

作　　者：王延生[1] 张勋[1] 徐庆生 

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]喜马塘煤矿有限公司,云南昭通657206

出　　处：《中国安全生产科学技术》2017年第10期115-121,共7页Journal of Safety Science and Technology

基　　金：国家自然基金面上项目(51174108);青年科学基金项目(51604144);辽宁省自然科学基金项目(20170540430)

摘　　要：针对近浅埋综采面过山丘地形发生强矿压显现的问题,采用现场监测、理论分析与数值模拟相结合的方法,建立山丘静载应力传递模型和不同岩层赋存特征的沙土型与土石型山丘工作面关键块体结构力学模型,分析山丘地形工作面矿压发生机理。研究表明:山丘静载向工作面传递的垂直应力呈钟形分布,山丘高静载应力易激发弱铰接结构失稳;山丘坡体中关键层的有无导致了土石型和沙土型山丘工作面矿压发生机理的差异性;坡体断裂块的倾斜回转运动是沙土型山丘工作面发生强矿压的主导因素,断裂块不同的倾斜回转方向导致工作面在上坡段矿压显现缓和而下坡段显现剧烈;土石型山丘工作面的矿压显现主要受坡体中关键块体结构稳定状态的控制,工作面在上坡初和坡顶段动载矿压强烈而下坡段后期较缓和。数值计算结果与现场监测和理论分析相符。Aiming at the problem of strong strata behavior in the near shallow buried fully mechanized mining face passing through the hill terrain,a transfer model of hill static load stress and a structural mechanics model of key blocks on the mining face in the sand-soil hill and soil-rock hill with different strata preservation characteristics were established by using the combination methods of field monitoring,theoretical analysis and numerical simulation,then the occurrence mechanism of mine pressure on the mining face in the hill terrain was analyzed. The results showed that the vertical stress which transferred by the hill static load to the mining face presented a bell-shaped distribution,and the high static load stress of hill was easy to cause the instability of weak hinged structure. The difference in the occurrence mechanism of mine pressure on the mining face in the sand-soil hill and soil-rock hill was caused by whether there was the key stratum or not in the hill slope. The inclined rotation motion of slope fault blocks was the dominant factor of the strong mine pressure on the mining face in the sand-soil hill,and the different inclined rotation directions of the fault blocks caused the slight strata behavior in uphill section whereas strong in downhill section on the mining face. The strata behavior on the mining face in the soil-rock hill was mainly controlled by the stable state of the key blocks structure in the slope,and the dynamic load mine pressure of the mining face was strong at the beginning of the uphill section and the hill top section whereas slight at the later period of downhill section. The results of numerical simulation were consistent with the field monitoring and theo-retical analysis.

关 键 词：山丘地形 近浅埋综采面 静载传递 动载矿压 静动载叠加 

分 类 号：TD322[矿业工程—矿井建设]