采空区覆岩破坏变形特征研究

以成庄矿4322综采工作面为工程背景,采用分析软件RFPA 2D对该工作面采空区覆岩破坏变形特征进行了数值仿真模拟研究。结果表明:受采矿应力大小、类型及分布等差异性影响,导致不同层段覆岩垮落、裂隙发育程度及类型、裂隙发育高度不同,并在采空区覆岩自下而上依次形成“垮落带、裂隙带及下沉弯曲带”等三个特征明显的采矿破坏变形带。采空区稳定形成后,垮落带最大发育高度达24 m(约3~4倍采高),裂隙带最大高度可达56 m(约9倍采高)。

Study on Failure and Deformation Characteristics of Overlying Strata in Goaf

Taking 4322 fully mechanized mining face of Chengzhuang Coal Mine as engineering background,the analysis software RFPA 2D was used to carry out numerical simulation study on the deformation characteristics of the overlying rock in the goaf of this face.The results show that,under the influence of mining stress,type and distribution,the overburden collapse,fracture development degree and type,and fracture development height are different in different strata,and three mining failure deformation zones with obvious characteristics are formed successively from top to bottom in the overlying strata of goaf,such as“caving zone,fracture zone and subsidence bending zone”.After the stable formation of goaf,the maximum height of caving zone reaches 24 m(about 3~4 times mining height),and the maximum height of fracture zone can reach 56 m(about 9 times mining height).