摘要
对小峪煤矿4801长壁工作面巷道在不同开采阶段,帮部支承压力分布特征进行了研究。研究结果表明:三巷道掘成后,中间巷道两帮围岩破坏深度大,且应力集中系数较高;两边巷道靠近中间巷的帮部围岩破坏深度比靠近外边的帮部围岩破坏深度要大,相应的应力集中程度也较高,但都小于中间巷道的两帮。上区段工作面采过后,由于巷道上覆破断块体的旋转下沉,靠近上区段采空区的煤柱压力增大,煤柱的塑性破坏区域加深,应力集中向岩体深部转移,在所有巷道和煤柱帮部中,靠近上区段采空区的破坏区域大,相应的应力集中程度也高;下区段工作面采过后,由于巷道上覆破断块体的旋转下沉,靠近下区段采空区的煤柱压力增大,煤柱的塑性破坏区域加深,应力集中向岩体深部转移。
This paper researches supporting pressure distributional characteristics of different mining stage in Xiaoyu colliery three roadways of the 4201 long well working face.The findings indicated.three are suitable the trough digs,middle along the trough two group of adjacent formation destruction depth is big,and the stress concentration factor is high.Outside two side tunnels approach the middle lane＇s gang adjacent formation destruction depth ratio to approach the gang adjacent formation destruction depth to be big,the corresponding stress concentration degree is also high,but among is smaller than along trough＇s two groups.on the sector working surface will pick from now on,because along trough on duplicate broken fault block body＇s revolving submersion,will approach on sector worked-out section virgin coal pressure build-up,the virgin coal plastic failure region deepens,the stress concentration will shift to the rock mass depth portion.In possesses along the trough and the virgin coal helps,approaches on the sector worked-out section destroyed area to be big,the corresponding stress concentration degree is also high;under the sector working surface will pick from now on,because along trough on duplicate broken fault block body＇s revolving submersion,under will approach sector worked-out section virgin coal pressure build-up,the virgin coal plastic failure region deepens,the stress concentration will shift to the rock mass depth portion.
出处
《中国煤炭》
北大核心
2011年第7期69-71,共3页
China Coal
