摘要
采用COMSOL数值模拟软件,建立三维矩形巷道钻孔交叉模型,研究不同地应力影响下的钻孔孔周应力分布及位移随钻孔深度的变化情况。研究表明:通过分析不同地应力作用下钻孔孔周的Mises应力分布,得到钻孔的左右两侧受压应力,上下两侧受拉应力,呈现出'蝴蝶状'。通过数值模拟及现场试验表明,由于钻孔受到上覆岩层应力及巷道应力重分布的影响,在距离孔口0~20m的范围内即巷道宽度的2倍左右,极易产生钻孔破坏。通过对不同地应力作用下钻孔孔周的应力分布以及位移变化分析,钻孔孔周应力及位移随孔深增加呈现出较强的幂指数关系。
The COMSOL numerical simulation software is used to establish a three-dimensional rectangular roadway borehole crossover model to study the circumferential stress distribution and displacement of the borehole under the influence of different ground stresses.It shows that,through analyzing the Mises stress distribution around the borehole under different ground stresses,the compressive stress on the left and right sides of the borehole is obtained,and the upper and lower sides are subjected to tensile stress,showing a'butterfly shape'.Through numerical simulation and field test,it is shown that the borehole is affected by overburden rock stress and roadway stress redistribution,and it is easy to produce borehole damage within the range of 0~20 m from the orifice,which is about twice the width of the roadway.According to the analysis of the stress distribution and displacement variation of the borehole under different earth stresses,the circumferential stress and displacement of the borehole exhibit a strong power exponential relationship with the increase of the bore depth.
作者
华明国
秦贵成
景晨
郭海龙
张天军
黄晓昇
HUA Ming-guo;QIN Gui-cheng;JING Chen;GUO Hai-long;ZHANG Tian-jun;HUANG Xiao-sheng(Shanxi Luan Group Yuwu Coal Industry Co.,Ltd.,Changzhi 046100,China;College of Energy Science and Engineering,Xi’an 710054,China)
出处
《煤炭工程》
北大核心
2019年第9期127-131,共5页
Coal Engineering
基金
国家自然科学基金项目(51774234)
“十三五”国家科技重大专项资助项目(2016ZX05067006-001)
关键词
COMSOL
数值模拟
抽采钻孔
孔周变形
COMSOL
numerical simulation
gas drainage borehole
deformation around the hole
