中文摘要：

运用概率积分法求出工作面回采后上覆岩层某一点的6个应变分量εx,εy,εz,γxy,γxz,γyz,进而求取3个主应变ε1,ε2,ε3;将3个主应变代入Drucker-Prager准则中,求出应力差.若应力差小于零,该点不破坏;若应力差等于零,该点处于临界状态;若应力差大于零,该点破坏,据此可判断上覆岩层裂隙的发育范围.通过现场观测裂隙带发育范围与测试瓦斯含量,确定了高瓦斯特厚煤层高抽巷的位置,实现了高抽巷的快速掘进.在高抽巷内,对圈定范围预抽瓦斯,实现了上、下巷的快速掘进.

英文摘要：

Using the probability integral method to calculate a point in the six strain components,εx,εy,εz,γxy,γxz,γyz,at the working surface of the overlying rock obtained the three main strain ε1,ε2,ε3;substituting three principal strain into the criterion of the D-P,Calculated the stress difference.If the result is less than zero,the point does not destroy;if the result equal to zero,the point in a critical state;if the result is greater than zero,the point of destruction.Accordingly we can judge on the scope of the development of the overburden fracture.With field observing the scope of the fracture overburden and determination of gas content,we can determine the location of the high level tunnel for drawing out gas（HLTDG）,and achieve the rapid excavation of the high level tunnel for drawing out gas.In HLTDG we can draw out gas with the scope of the delineation,and then achieve rapidly to excavate up and down the tunnel.