钻孔孔径及布置方式对煤巷卸压效果的影响  

Effects of Hole Diameter and Arrangement on Tunneling Surface Relief Effect

作　　者：高永格[1] 靳志新 孟晓强[1] 张纪云 

机构地区：[1]河北工程大学资源学院,河北邯郸056038 [2]河南迅达爆破有限公司,河南焦作454000

出　　处：《煤炭技术》2017年第1期138-140,共3页Coal Technology

基　　金：国家自然科学基金项目(51474217)

摘　　要：以陶一矿七采区南翼回风巷卸压孔优化设计为基础,通过理论分析、FLAC3D数值模拟与现场观测相结合的方法对相同地质条件下钻孔不同孔径大小周围应力分布演化规律进行分析。结果表明:在相同地质条件下适当增大钻孔直径可有效增加钻孔周围塑性区半径,提高钻孔卸压效果;卸压孔布置方式不合理不仅起不到很好的卸压效果,反而可能导致煤巷掘进面局部应力集中而不利于卸压消突。Based on the pressure relief hole optimization design in the return airway of the south seventh mining area in Taoyi mine, the stress distribution around the pressure relief hole under the same geological condition is analyzed through the theoretical analysis, FLAC3D numerical simulation and the field observation method.Results show that under the same geological conditions, the appropriate increase of the diameter of the borehole can effectively increase the radius of the plastic zone around the hole, and then improve the effect of pressure relief; the arrangement of the pressure relief hole which is not reasonable not only can not play a very good pressure relief effect, but may result in the local stress concentration in the coal roadway heading face, which is not conducive to the pressure relief and elimination process.

关 键 词：钻孔卸压 卸压孔孔径 卸压效果 

分 类 号：TD713[矿业工程—矿井通风与安全]