大倾角厚煤层长壁综放开采基本顶破断模式及演化过程(Ⅰ)——初次破断  

Fracture mode and evolution of main roof stratum above longwall fully mechanized top coal caving in steeply inclined thick coal seam(Ⅰ) — initial 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王家山煤矿,甘肃白银730900

出　　处：《煤炭学报》2015年第6期1353-1360,共8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：大倾角特厚煤层走向长壁综放开采过程中,由于直接顶冒落后采空区充填不均匀,基本顶断裂呈现非对称特征。基于弹性力学理论,建立了横纵荷载作用下大倾角煤层基本顶的薄板力学模型,分析了基本顶上、下板面的应力分布特征,获得了基本顶断裂线发育轨迹与破坏区演化规律,提出了大倾角煤层基本顶的初次破断"V—Y"型断裂模式。研究表明,大倾角煤层基本顶初次断裂的空间顺序为"中上部→中下部→上部→下部"。结合数值模拟、现场监测等手段,验证了基本顶初次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。Because gob is unevenly filled by the fallen immediate roof stratum in longwall fully mechanized top coal caving mining of steeply inclined thick coal seam,the main roof stratum presents an asymmetric fracture pattern. Based on the theory of elasticity,an analytic model of thin plate was established under the consideration of vertical and lateral loads for the main roof above steeply inclined coal seam. The stress distribution in the up and low surface was analyzed,and the initial fracture trajectory development and failure zone evolution were revealed. The initial fracture mode of the main roof,termed as 'V- Y'was put forward. The study shows that the spatial sequence of initial fracture follows 'upper-middle to lower-middle,and upper to lower'of the mining face. In combination with numerical modeling and in-situ monitoring,the sequential and asymmetrical characteristics of stress distribution in the main roof stratum and the mining induced pressure in working face are verified during initial fracture.

关 键 词：大倾角煤层 长壁综放开采 基本顶 初次断裂 悬顶结构 

分 类 号：TD823.2[矿业工程—煤矿开采]