多孔割缝后煤层变化规律对卸压效果影响的数值分析  

Numerical analysis on seam variation law after multi boreholes cutting and cracking affected to pressure releasing effect

作　　者：张海宾[1,2] 林柏泉[1,2] 孟凡伟[1,2] 张敬瑶[1,2] 杨威[1,2] 

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,江苏徐州221008 [2]中国矿业大学安全工程学院,江苏徐州221008

出　　处：《煤炭工程》2010年第11期71-73,共3页Coal Engineering

基　　金：国家自然科学基金资助项目(50574093;50534090);国家重点基础研究发展计划(2005cb221506);"十五"国家科技攻关重点资助项目(2005ba813b07)

摘　　要：文章针对高压水射流多孔割缝对煤层的应力及位移的变化影响,研究了该技术在煤层整体卸压方面的作用效果。通过FLAC3D软件分析得出,煤层进行割缝后的1m区域内,应力降低65%以上,位移变化4.11mm以上,同时在3m以内的范围能够达到整体卸压的效果。经现场应用表明,该技术可以使割缝孔之间相互作用,形成裂隙网络,煤体得到充分卸压,增加煤层的透气性,提高瓦斯的抽采率。According to the multi borehole high pressured water jet cutting slots affected to the variation of the stress and displacement in the seam,the paper had a study on the role effect of the high pressure water jet technology in the full pressure releasing of the seam.The analysis with the FLAC 3D software showed that within the 1 m of the cutting slots in the seam,the stress of the seam would be reduced over 65 %,the displacement variation would be over 4.11 mm and the full pressure releasing effect would be reached when the cutting slots within 3 meters.The site application showed that the water jet technology could have a mutual function between the cutting slot boreholes and could form the cracking network.The seam could be fully released,the permeability of the seam would be increased and the gas drainage rate would be increased.

关 键 词：多缝槽 卸压 应力分布 数值模拟 

分 类 号：TD712.6[矿业工程—矿井通风与安全]