张集煤矿1411工作面的溃砂风险评估

Sand Inrush Risk Assessent on 1411 Working Face in Zhangji Coal Mine

为了探究张集煤矿1411工作面的溃砂风险,综合FLAC 3D数值模拟软件、公式法和现场跨孔电阻CT成像技术,推测出1411工作面的裂隙带高度在45 m左右,裂隙带穿透上方含水层,存在溃砂风险。通过公式计算和水动力学分析,综合判断出1411工作面覆岩的临界水力坡度为1.92,实际水力坡度为0.58,小于临界水力坡度值,说明当涌水通道形成时,含水层内泥沙不会随水流运动出现大规模移运,溃砂风险较低。

In order to explore the risk of sand inrush of the 1411 working face in Zhangji Coal Mine,the FLAC 3D numerical simulation software,formula method calculation and on-site cross-hole resistance CT imaging technology were combined to infer that the height of the fissure zone of the 1411 working face was about 45 m,the water above the fissure zone penetrated layer and there was a risk of sand burst.Through formula calculation and hydrodynamic analysis,it was comprehensively judged that the critical hydraulic gradient of the overlying rock of the 1411 working face was 1.92,and the actual hydraulic gradient was 0.58,which was less than the critical hydraulic gradient value,indicating that when the water inflow channel was formed,there was no large-scale migration of sediment in the aquifer with the movement of water flow,and the risk of sand burst was low.