埋深对钻孔孔周位移及裂隙分布特征的影响  

Influence of Burial Depth on Displacement and Fractures Distribution Characteristics Around Borehole

作　　者：刘小毅 曹国选 王冬冬 李彦云 LIU Xiaoyi;CAO Guoxuan;WANG Dongdong;LI Yanyun

机构地区：[1]陕西煤业化工集团孙家岔龙华矿业有限公司,陕西榆林719314

出　　处：《中国矿山工程》2024年第6期56-60,67,共6页China Mine Engineering

摘　　要：本文通过构建钻孔数值模型,采用埋深表征钻孔整体受力水平,探究不同埋深条件下钻孔孔周应力分布特征,阐明钻孔孔周位移时变特征及分布情况,揭示埋深对钻孔孔周裂隙发育的影响。结果表明:在钻孔周围煤体的应力场调整后,出现应力集中现象。随着埋深增加,钻孔孔周应力逐渐增大,应力集中区范围不断增大。孔周煤体变形存在一定的方向性,煤体的变形会沿着直线方向发生较大的变形,与此直线的垂直方向会出现较小的变形。随埋深增加,孔周煤体变形增大。裂隙的发育与煤体周围变形存在着一定对应关系。随埋深增加,裂隙发育逐渐明显,并呈中间集中、四周分散的分布特点。In this study,the numerical model of the drill hole is constructed,and the depth of burial is used to characterize the overall stress level of the borehole,to investigate the stress distribution characteristics around the borehole under different burial depths,to elucidate the time-varying characteristics and distribution of the displacement around the borehole,and to reveal the influence of the depth of burial on the development of the cracks around the borehole.The results show that the stress concentration phenomenon occurs after the stress field of the coal around the drill hole is adjusted.With the increase of burial depth,the stress around the drill hole gradually increases,and the range of stress concentration area is increasing.The deformation of the coal body around the hole has a certain direction,and the deformation of the coal body will be larger along the straight line direction,and the perpendicular direction to this straight line will have a smaller deformation.With the increase of burial depth,the deformation of coal around the borehole increases.There is a certain correspondence between the development of fissures and the deformation around the coal.With the increase of burial depth,the development of fractures is gradually obvious,and the distribution is characterized by concentration in the middle and dispersion around.

关 键 词：埋深 钻孔 数值模拟 位移分布 裂隙分布 

分 类 号：TD823[矿业工程—煤矿开采]