煤矿巷道围岩卸荷变形及破坏规律试验研究

Experimental Study on Unloading Deformation and Failure Law of Surrounding Rock in Coal Mine Roadway

以方山县店坪煤矿巷道为对象,借助三维有限元差分模拟软件FLAC3D,通过设置不同内径与不同围压的巷道进行模拟试验,来研究卸荷过程中的切向应变及其破坏规律,发现缓慢卸荷下有利于变形的充分释放,围岩卸荷变形会随围压增大而增大。建议在实际工程中为了防止围压造成的破坏,应加大巷道内部的支护力。

Taking the Dianping Coal Mine roadway in Fangshan County as the object,using the three-dimensional finite element difference simulation software FLAC3D,simulation experiments are conducted by setting the roadway with different inner diameters and confining pressures to study the tangential strain and its failure law during the unloading process.It is found that slow unloading is beneficial for the full release of deformation,and the unloading deformation of the surrounding rock will increase with the increase of confining pressure.It is recommended to increase the support force inside the roadway in practical engineering to prevent damage caused by confining pressure.