大直径煤层钻孔注水压裂防治冲击地压数值模拟  

Numerical simulation analysis of rockburst prevention by large diameter coal seam boreing water injection and fracturing

作　　者：杨月[1] 潘一山[1] 罗浩[1] 李忠华[1] 徐军[1] 

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《辽宁工程技术大学学报（自然科学版）》2014年第4期451-455,共5页Journal of Liaoning Technical University (Natural Science)

基　　金：国家重点基础研究发展规划(973)基金资助项目(2010CB226803);国家自然科学基金资助项目(11172121)

摘　　要：为消除冲击地压危险性,采用数值分析方法模拟大直径煤层钻孔注水压裂过程,分析单孔不同侧压系数和多孔不同布置方式下注水压裂效果.研究结果表明:注水使煤层大范围卸压,产生的大量裂隙削弱煤体应力,水的作用改变煤体的物理力学性质,有效防治冲击地压发生;裂缝扩展方向与侧压系数相关,随侧压系数增大,裂缝扩展方向由竖直方向转为水平方向;不同钻孔布置方式卸压效果不同,沿垂直方向四方布置卸压范围比单排布置和三花布置高出35.8%和31.3%,四方布置更适合于冲击地压矿井厚煤层开采,分析结果对冲击地压矿井安全开采具有重要指导意义.In order to remove the danger of rockburst, large diameter drilling injection coal seam fracturing process was simulated numerically. The effect of single hole with different lateral pressure coefficients and multihole porous water fracturing under different modes of arrangement were also analyzed. The results show that water injection can relief pressure in a wide range and the cracks waken the stress of coal and the water in the hole of coal change the physical and mechanical properties which can prevent rock burst effectively. The crack propagation direction has a correlation with lateral pressure coefficient, which changes from vertical to horizontal direction with lateral pressure coefficients increasing. Different pressure relief with different hole arrangement mode, pressure relief range in square arrangement is 35.8% and 31.3% higher than that in single-row and three-cornered along the vertical direction. So, square arrangement mode is more adaptable to mine thick coal seam of rock burst mine. The conclusion presents important references for safety mining of rockburst mine.

关 键 词：大直径 煤层钻孔 水力压裂 冲击地压 RFPA 裂缝 侧压系数 卸压范围 

分 类 号：TD324[矿业工程—矿井建设]