影响割缝钻孔卸压效果因素的数值分析  

A Numeric Analysis of the Effects Different Factors Have on Slotted Drilling

作　　者：林柏泉[1] 杨威[1] 吴海进[1] 孟凡伟[1] 赵延旭[1] 翟成[1] 

机构地区：[1]中国矿业大学煤炭资源与安全开采国家重点实验室安全工程学院,江苏徐州221008

出　　处：《中国矿业大学学报》2010年第2期153-157,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(50574093;50534090);国家重点基础研究发展计划(973)项目(2005CB221506);国家科技支撑计划项目(2006BAK03B0403);国家自然科学基金青年科学基金项目(50804048);中国矿业大学煤炭资源与安全开采重点实验室开放研究基金项目(09KF09)

摘　　要：通过对钻孔周围应力分布的研究,指出"瓶塞效应"是制约其影响范围的主要因素,割缝可以消除此效应;数值模拟表明割缝高度对缝槽上方煤体卸压影响不显著,考虑到蠕变等因素要求缝槽高度不低于16mm;缝槽深度对缝槽上方煤体卸压起到显著影响,当缝槽深度从0.227m增大到0.770m时,缝槽上部1.03m处煤体应力由6.2MPa降低到3.1MPa,通过增大缝槽深度以增加钻孔的影响范围是可行的;由于钻孔割缝后其影响范围增加,相邻钻孔间相互影响使得钻孔影响范围进一步增大,必须把多个钻孔当作一个整体来研究布孔情况.The ＂stopper effect＂ was found to be the main factor limiting the range of pressure relief from stress-relief drillings. By studying the stress around a drilling it was determined that slotting the drilled hole can eliminate this negative effect. It was observed that the slot height had little effect on pressure relief in the coal above the drilling. Still, consideration of creep deformation and other factors suggests the slot height should be grater than 16 mm. On the other hand, slot depth greatly affects pressure relief in the coal above the drilling. Chan- ging slot depth to 0.77 m from 0. 227 m caused the stress in the coal measured 1.03 meters above the slot to drop to 0.31 MPa from 6.2 MPa. Hence it is possible to increase the effective range of the drilling by increasing the slot depth. The greater range of pressure relief allows the effect from adjacent drillings to overlap. Hence several drillings must be regarded together as a system.

关 键 词：割缝钻孔 缝槽 “瓶塞效应” 应力 影响范围 

分 类 号：TD713.3[矿业工程—矿井通风与安全]