大断面半煤岩巷变形规律及支护技术研究  

Study on Deformation Law and Supporting Technology of Semi-coal Roadway with Large Section

作　　者：胡晓明 胡桂林 潘华 宋秋明 王浩 HU Xiaoming;HU Guilin;PAN Hua;SONG Qiuming;WANG Hao(Hubei Bureau of Coal Geology of China National Administration of Coal Geology,Wuhan 430070,China;China Coal Hubei Geological Prospecting Basic Engineering Co.,Ltd.,Wuhan 430070,China)

机构地区：[1]中国煤炭地质总局湖北煤炭地质局,武汉430070 [2]中煤湖北地质勘察基础工程有限公司,武汉430070

出　　处：《煤炭技术》2023年第7期35-39,共5页Coal Technology

摘　　要：为解决大断面巷道受工程扰动易发生变形等问题,基于等效圆法对7105大断面矩形运输巷围岩破坏松动圈范围进行了计算,得出巷道顶板、两帮松动圈范围分别为2.31、1.31 m,基于此提出了“锚杆+锚索”联合支护方案,通过数值模拟对支护方案进行了效果分析,表明支护后巷道塑性区、顶板下沉量、两帮水平位移分别减小了80%、46%、65%。基于坐标转换法计算了以巷道轴向为基准的应力分量,探究了巷道最大水平应力不同方向情况下巷道破坏特征,发现巷道破坏在一定范围内变形与巷道所受最大主应力与巷道轴向夹角θ呈正相关或负相关关系,且分别在θ=60°与90°时发生最大变形与最小变形。In order to solve the problem that large section roadway is prone to deformation due to engineering disturbance,based on the equivalent circle method,the surrounding rock failure and loose circle range of 7105 large section rectangular transportation roadway is calculated,and the loose circle range of roadway roof and two sides are 2.31 m and 1.31 m,respectively.Based on this,the "bolt +cable" combined support scheme is proposed.Through numerical simulation,the effect of the support scheme is analyzed,which shows that the plastic zone of the roadway is reduced,the roof subsidence amount and the horizontal displacement of the two sides are reduced by 80%,46% and 65%,respectively.Based on the coordinate transformation method,the stress components based on the axial direction of roadway are calculated,and the failure characteristics of roadway under different directions of maximum horizontal stress are explored.It is found that the deformation of roadway is positively or negatively correlated with θ in a certain range,and the maximum and minimum deformation occur whenθ=60° and 90°,respectively.

关 键 词：大断面巷道 矩形巷道 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]