摘要
基于高压水射流割缝卸压增透技术,对割缝后瓦斯抽采和煤体透气性的变化进行了研究;分析了地应力和瓦斯压力对煤体透气性的影响;根据现场实际割缝工艺建立模型,采用FLAC软件模拟计算了割缝煤体卸压影响范围的变化特性;采用相似物理模拟实验的方法建立相似模型,测定煤体在割缝卸压变化过程中透气性的变化规律;并进行了现场试验验证与应用。研究表明:高压水射流割缝后煤体周围会产生卸压,煤体透气性随割缝卸压影响而增大;现场试验结果显示,割缝后煤体透气性增大至原来的113倍,抽采有效影响半径扩大1倍。
Based on pressure relief and permeability increase technology used by high-pressure water jet slotting,researched the changes of slotted coal seam permeability.Analyzed the effect of stress and pressure on gas permeability of coal.According to the actual slotted process to set model,using FLAC simulation software,simulated the change characteristics of the relief effect scope of slotted coal.Adopted a similar method of physical modeling experiments and established similar model to measure permeability variation when the process of slotted coal seam pressure relief changes;and conducted field trials.The results show that the pressure relief around coal after slotting,coal permeability increases with the impact of pressure relief after slotting.Field test results show that after slotting,coal seam permeability increases to 113 times of the original,effective influence on extraction expands to 2 times of the original radius.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2011年第12期2058-2063,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)
国家自然科学基金资助项目(51074161)
煤炭资源与安全开采国家重点实验室自主研究课题资助项目(SKLCRSM08X03)
关键词
高压水射流
割缝
透气性
卸压
high-pressure water jet
slotted
permeability
relief
