煤巷掘进头存在卸载孔时矿山岩石的应力状态

STRESS STATE OF ROCK-MASS AROUND GATEWAY DRIVING FACE WITH STRESS-RELEASING HOLE

本文研究了卸载孔及向掌子面注水对煤巷掘进头岩石应力状态的影响。提出了无卸载孔、有卸载孔及卸载后再注水三种方案,用有限元法对岩石应力状态进行了数值模拟;认为,所打钻孔数量越多和钻孔直径越大,规卸载效果越好。

The effect of stress-releasing hole and water injection to the face on rock stress state around gateway driving face has been studied in this paper. Three schemes are suggested: face end without stress-releasing hole, with stress-releasing hole and water injection after stress-releasing. By use of FEM, a numerical modelling of the rock stress state has been carried out.The analysis of the result shows that the more the number of the stress-releasing holes and the bigger the diameter of the hole, the better the stress-releasing effect.