井下高压水射流切割煤层增透效果数值模拟  

Numerical simulation study on permeability enhancement effect of high pressure water cutting coal seam

作　　者：孙四清[1,2] 郑凯歌 SUN Siqing;ZHENG Kaige(China Coal Research Institute, Beijing 100013, China;Xi’an Research Institute of China Coal Technology &Engineering Group Corp., Xi’an 710077, China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团西安研究院有限公司,陕西西安710077

出　　处：《煤田地质与勘探》2017年第2期45-49,共5页Coal Geology & Exploration

基　　金：国家科技重大专项课题(2011ZX05041-003)~~

摘　　要：针对井下高压水射流切割煤层增透技术,利用FLAC^(3D)数值模拟软件,建立三维有限元模型,对不同煤体结构(软煤、硬煤)、切割深度和切割环数等因素的卸压增透效果进行数值模拟分析。模拟结果表明:在水力切割相同半径下,软煤的卸压范围约为硬煤的1.8倍,变形量约为硬煤的2.6倍;水力切割半径由0.5 m增至1 m时,煤体中应力降低为90%的区域和煤体变形量分别提高到1.56倍和1.66倍;相邻切割缝槽之间出现了交互影响,钻孔的卸压范围和煤体变形量显著增大,水力切割区域煤体呈现整体卸压状态。将数值模拟的卸压范围与理论公式计算结果进行了对比,二者之间的误差为0.46%~9.84%,表明采用数值模拟技术研究水力切割增透效果是可靠的。For permeability enhancement technology of high pressure water cutting coal seam,the effect of pressure relief in different coal(soft and hard coal),the corresponding slot number and the cutting depth were analyzed trough numerical simulation.The numerical simulation study was realized by three-dimensional finite element model established by the numerical simulation software FLAC3D.The results showed that the released pressure and distortion range of soft coal were respectively about1.8and2.6times higher than hard coal's when the hydraulic cutting radius was the same.When the slot radius increased from0.5m to1m,the area of which pressure was90%of the original and distortion range increased respectively to1.56times and1.66times.The drilling pressure relief and the deformation range of coal increased significantly which were caused by the mutual influence emerged between the slots,the hydraulic coal cutting area presents the overall pressure relief.The error range is0.46%to9.84%when the released range of the numerical simulation was compared with the results of theoretical formula,it shows that it is reliable to use numerical simulation to study the effect of permeability enhancement of hydraulic cutting.

关 键 词：水力切割 增透效果 数值模拟 煤体结构 FLAC3D 

分 类 号：TD712.62[矿业工程—矿井通风与安全]