大采高采场上覆岩层运动规律的研究

Research of the Overlying Rock Movement Law in Large Mining Height Field

应用"关键层"理论对宫地矿大采高采场上覆岩层结构进行了计算分析,确定了工作面覆岩层的主关键层和亚关键层,应用三维离散单元法软件3DEC建立应变模型对不同采高情况下覆岩层运动规律进行了研究。研究结果表明,随着工作面采高的增加,覆岩层的冒落空间、顶板离层量及碎胀系数增加,顶板断裂线明显前移。上述分析结果为大采高综采面围岩控制提供依据。

The "key layer"theory was applied to the calculation and analysis of the overlying strata structure of the Gongdi coal large mining height field,the main and sub-key strata of the overburden was determined. The 3D Discrete Element Method Software 3DEC was used to establish the strain model to study the movement law of overburden strata under different mining height conditions, The results show that with the increase of face mining height, the falling space, roof separation and broken coefficient of the overlying strata increase, The fracture line of the roof obviously moved forward. The above analysis results provide the basis for the control of surrounding rock mass in fully-mechanized mining face.