摘要
针对充填开采采空区顶板破断的结构进行划分,并基于薄板理论给出采空区顶板破断的计算公式,通过理论计算与顶板钻孔实测分析判断唐山矿F5001充填工作面的顶板破断类型,且进一步地揭示了采空区顶板运动规律。研究结果表明:充填开采采空区顶板破断结构可以按照3类结构进行划分:Ⅰ类结构为直接顶和基本顶都会发生破断;Ⅱ类结构为直接顶发生破断,但是基本顶不会出现破断;Ⅲ类结构为直接顶和基本顶都不会发生破断。根据所建立的顶板弹性薄板力学模型对工程算例进行计算,确定F5001工作面的顶板破断结构类型属Ⅱ类结构;数值模拟分析表明,F5001工作面充填后,最大下沉量降低了34.4%,塑性区范围降低了74.7%,充填体支撑作用有效控制了覆岩沉降与断裂,对覆岩控制起到关键作用,顶板破断结构、覆岩破坏高度与理论计算和现场实测相符合。
According to the structure of the roof fracture in the goaf of filling mining, the calculation formula of the roof fracture in the goaf is given based on the thin plate theory. The roof fracture type of the F5001 filling working face in Tangshan mine is judged through theoretical calculation and the actual measurement analysis of roof drilling, and the movement law of the roof in the goaf is further revealed. The results show that the roof fracture structure of the gob can be divided into three types:type Ⅰ structure is that both the direct roof and the basic roof will fracture;type II structure is that the direct roof breaks, but the basic roof does not break;type III structure is the direct roof and the basic roof will not break. According to the elastic thin plate mechanical model of the roof, the engineering calculation example is calculated, and the roof breaking structure type of F5001 working face is determined to be type II structure;the numerical simulation analysis shows that after the filling of F5001 working face, the maximum subsidence is reduced by 34.4%, and the plastic area is reduced by74.7%. The supporting effect of the filling body effectively controls the settlement and fracture of the overburden, which plays a key role in the control of the overburden. The roof fracture structure and the overburden failure height are consistent with the theoretical calculation and field measurement.
作者
王琪
石增柱
苑龙峰
徐夕岭
傅知勇
WANG Qi;SHI Zengzhu;YUAN Longfeng;XU Xiling;FU Zhiyong(Tangshan Mining Branch Company,Kailuan Group Co.,Ltd.,Tangshan 063000,China;College of Mining,Liaoning Technical University,Fuxin 123000,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《煤炭技术》
CAS
北大核心
2023年第3期38-43,共6页
Coal Technology
关键词
矸石充填
顶板破断结构
顶板运动规律
数值模拟
gangue backfilling
roof breaking structure
roof movement law
numerical simulation
