大倾角厚煤层长壁综放开采基本顶破断模式及演化过程(Ⅱ)——周期破断  

Fracture mode and evolution of main roof stratum above fully mechanized top coal caving longwall coalface in steeply inclined thick coal seam(Ⅱ) : Periodic fracture

作　　者：王金安[1] 张基伟[1] 高小明 文建东 古亚丹 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]甘肃靖远煤电股份有限公司,甘肃白银730900

出　　处：《煤炭学报》2015年第8期1737-1745,共9页Journal of China Coal Society

基　　金：国家自然科学基金重点资助项目(U1361208)

摘　　要：基于弹性力学理论,建立了大倾角综放工作面推进过程中基本顶由小三角形悬板→大三角形悬板→斜梯形板转化的薄板力学模型,计算出3种形状基本顶的上、下板面的应力分布,揭示了断裂线发育轨迹与破坏区演化过程,阐明了大倾角煤层基本顶周期破断的"四边形"型断裂模式。研究表明,大倾角煤层基本顶周期断裂的空间顺序为"中下部→中上部→上部→下部"。结合数值模拟、现场监测等手段,验证了基本顶周期断裂过程中采场围岩应力场分布及矿压显现具有时序性和非对称特征。Based on the theory of elasticity,thin plate mechanical analytic models of main roof stratum transformed from small triangular,big triangular and trapezoid above caving gob were established during the mining face advancing in steeply inclined thick coal seam. The stress distributions in the upper and lower surface of main roof stratum in three types of models as mentioned above were calculated. The laws of fracture trajectory development and failure zone evolution were revealed. The periodic fracture mode of main roof stratum,termed as 'Quadrangle'was put forward with respect to the mining of steeply inclined thick coal seam. The study shows that the spatial sequence of periodic fracture is 'lower-middle to upper-middle,and upper to lower'of the mining face. In combination of numerical modeling and monitoring,the asymmetrical and sequential characteristic of stress distribution in the main roof stratum and the mining induced pressure in working face are verified during periodic fracture.

关 键 词：大倾角煤层 综放开采 基本顶 周期断裂 悬顶结构 

分 类 号：TD823.97[矿业工程—煤矿开采]