College of Mining Engineering, Taiyuan University of Technology
Shanxi Xinyuan Coal Co. , Ltd.

为深入研究短壁充填工作面采空区顶板及矸石充填体之间的相互作用关系,以新元矿3211工作面实际开采条件为研究背景,运用理论分析、现场监测、数值模拟等手段对充填开采条件下采空区顶板的位移变化规律及矸石体力学承载特性进行系统研究,得出结论:采空区顶板下沉可分为:自由沉降阶段、约束沉降阶段、缓慢递增阶段、震荡趋稳阶段;随着工作面推进采空区充填矸石呈明显的应变硬化特性,最终矸石的压缩模量为67.6MPa;充填体矸石的应力-应变曲线阶段特征明显,在应变值小于0.103的区间内,应力值基本维持在0.3MPa,之后,应力值呈指数递增;沿工作面倾向范围内最终的位移变化曲线呈抛物线状,中心区最大、次中心区较小、边缘区最小。

In order to deeply study the interaction between goaf roof and gangue backfill in short wall filling face. Based on the geological data of 3211 working face in Xinyuan Mine, the displacement change law of goaf roof and the mechanical bearing characteristics of gangue were systematically studied sunder the condition of filling mining by means of theoretical analysis, on-site monitoring and numerical simulation. The conclusions are as follows: the subsidence of goaf roof can be divided into free subsidence stage, constrained subsidence stage, slow increasing stage and shock stabilization stage; with the advance of the working face, the gangue filled in the goaf shows obvious strain hardening characteristics, and the final compression modulus of the gangue is 67. 6 MPa; the stage characteristics of the stress-strain curve of the filling gangue are obvious. In the range where the strain value is less than 0. 103, the stress value is basically maintained at 0. 3 MPa, then the stress increases exponentially; the final displacement change curve along the dip range of the working face is parabolic, which is the largest at central area, smaller at sub central area and the smallest at the edge.

刘 冲, 王俊峰, 董智宇, 等. 短壁充填工作面采空区顶板运移规律及充填体应力响应特征研究 [J]. 煤炭工程, 2023, 55(9): 91-95.