单一煤层钻孔割缝卸压增透的非连续变形分析(DDA)模拟  

The numerical modelling of slotted drilling in single coal seam based on DDA

作　　者：高亚楠[1,2] 程红梅[1] 李玺茹[2] Man-chu Ronald Yeung 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116 [3]California State Polytechnic University,Pomona CA,91768

出　　处：《煤炭学报》2011年第12期2068-2073,共6页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2011CB201205);深部岩土力学与地下工程国家重点实验室基金资助项目(SKLG-DUEK0901)

摘　　要：为了进一步研究"钻-割-抽"一体化技术的卸压效果,以非连续变形分析为手段,并引入大变形理论对DDA源程序进行了二次开发,建立煤层钻孔割缝的数值模型,对煤层钻孔割缝的卸压效果进行分析,进一步解释了工程中的"瓶塞效应"机理;考察了缝槽的高度、宽度以及构造应力对卸压效果的影响,指出相对于缝槽高度,缝槽宽度的变化对卸压效果的影响可以忽略;构造应力的增加,使卸压效率降低,应增加割缝的高度。此外,还给出了多个缝槽切割后煤层应力释放情况。In order to carry out a further study on effect of ＂drilling-slotting-extraction＂ technology,based on the discontinuous analysis（DDA） method and the large deformation theory,the model of drilling-slotting-extracting was established.The ＂bottlenet effect＂ was further interpreted;the effect of slot height,slot width and tectonic stress was investigated.It shows that the effect of slot width can be ignored;as the increasing of slot height,the area of high ratio pressure relief will increase;and the increasing of tectonic stress may result in the ratio of pressure relief decreasing,so as the increasing of the tectonic stress,and the height can be increased.The multi-slot case was also computed.

关 键 词：钻孔割缝 卸压 非连续变形分析 缝槽 

分 类 号：TD712.61[矿业工程—矿井通风与安全]