摘要
为了保证深部巷道掘进过程中围岩稳定,深入分析巷道布置方向和深部水平主地应力分布之间的关系,以首山一矿为工程背景,利用理论计算方法求出最优角度,使用数值模拟方法分析煤巷布置轴向与最大水平主地应力σH不同夹角时模型的塑性区分布,最大主应力差变化和围岩变形特征。结果表明:煤巷掘进后从煤巷壁面到围岩深部围岩的最大主应力差大致可以分成“增长-降低-稳定”三区;当作用在煤巷两帮的水平法向应力σn与垂直主地应力近似相等时水平地应力对煤巷布置掘进稳定性影响最小,根据对现场数据的理论计算和模拟结果的分析,巷道轴向与σH夹角大小为30°左右时巷道较为稳定。
In order to ensure the surrounding rock stability during deep roadway excavation and analyze the relationship between the roadway layout direction and the distribution of deep horizontal principal ground stress, taking Shoushan No.1 Mine as the engineering background, the optimal angle was determined through theoretical calculation, and the plastic zone distribution of the model, the change of the maximum principal stress difference and the deformation characteristics of the surrounding rock were analyzed with numerical simulation, when the coal roadway layout axial and the maximum horizontal principal ground stress σHare at different angles. The results show that the maximum principal stress difference from the wall surface of the coal roadway to the deep surrounding rock after excavation can be roughly divided into growing zone, decreasing zone and stabilizing zone. When the horizontal normal stress σnacting on the two side-walls of the coal roadway is approximately equal to the vertical principal ground stress, the horizontal ground stress has the least influence on the excavation stability of the coal roadway layout. According to the theoretical calculation of the field data and the analysis of the simulation results, the roadway is more stable when the angle between the axial direction of the roadway and σHis about 30°.
作者
李延河
翟成
丁熊
LI Yanhe;ZHAI Cheng;DING Xiong(Pingdingshan Tianan Coal Mining Corporation Limited Liability Company,Pindingshan 467000,China;China Pingmei Shenma Holding Group Co.,Ltd.,Pingdingshan 467000,China;School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《煤炭工程》
北大核心
2023年第2期86-92,共7页
Coal Engineering
基金
国家自然科学基金面上项目(51925404)。
关键词
深部巷道
巷道掘进
主应力差
巷道布置
围岩稳定性
deep roadway
roadway excavation
principal stress difference
layout of roadways
surrounding rock stability
