大采高采场顶板运移破断特征的数值模拟研究

Numerical Simulation on Roof Movement and Fracture Characteristics in Large Mining Height Stope

基于大采高采场采动引起的覆岩运移破断问题,主要对大采高工作面开采过程中顶板的运移变形与破断失稳规律进行数值模拟研究,结果表明:亚关键层下部岩层属于冒落带,亚关键层上部到主关键层范围属于裂隙发育带,主关键层上部岩层属于弯曲变形带;当关键层从稳定转变为破断失稳时,其变形量陡增;工作面开采高度和关键层数量对覆岩运移变形以及稳定性的影响效果显著。

Aiming at the movement and fracture of overlying strata caused by the mining in large mining height stope,the study carried out a numerical simulation on the displacement deformation,fracture,and instability of the roof in the mining process of the working face with large mining height.The results show that:the lower strata of sub-key strata belong to the caving zone,the range from the upper part of the sub-key strata to the main key strata belongs to the fracture development zone,and the upper strata of main key strata belong to the bending deformation zone.When the key strata change from stable to broken and unstable,its deformation increases sharply.The mining height and the number of key strata have significant effects on the movement,deformation,and stability of overlying strata.