大断面硬岩巷道分叉段围岩变形规律的分叉角效应研究  

Study on Bifurcated Angle Effect of Surrounding Rock Deformation Law of Large-section Hard Rock Bifurcation Roadway

作　　者：赵庆民[1,2] 施现院 常庆粮[3,4] 

机构地区：[1]山东能源淄博矿业集团有限责任公司,山东淄博272175 [2]山东省充填开采工程技术研究中心,山东淄博255000 [3]淄博矿业集团有限责任公司博士后流动站,山东淄博255000 [4]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《煤矿安全》2017年第2期60-64,共5页Safety in Coal Mines

基　　金：泰山学者建设工程专项经费资助项目(201309)

摘　　要：以岱庄矿1160石门联巷为工程实例,构建巷道分叉角分别为30°、45°、60°、75°、90°时的5种数值模型,从应力和应变2个角度研究分叉段围岩变形规律的分叉角效应。结果表明,分叉段顶板最大下沉量及其与分叉点的水平距离与分叉角均存在负相关性,同时拟合出了后者与分叉角之间的似线性方程。分叉段围岩集中应力系数在1.5~3之间,分叉角在45°以下和45°以上时,集中应力和分叉角的负相关性分别为显著和逐渐变弱。可见,巷道分叉角应不小于45°,且分叉段围岩变形剧烈区域应加强支护。Taking 1160 cross-cut connecting roadway of Daizhuang Coal Mine as engineering project, numerical models for 5 kinds of bifurcated roadway were built, whose bifurcated angle were 30°, 45°, 60°, 75°, 90° respectively. The paper mainly analyzed the surrounding rock deformation laws of large-section hard rock bifurcation roadway with different bifurcated angles h＇om two aspects of stress and strain. As a result, there is a negative relationship between bifurcated angle and the maximum roof subsidence of bifurcation roadway surrounding rock, as well as the distance from the position of the maximum roof subsidence to bifurcated point. Also, the similar linear equation of the latter two was established. Furthermore, the results show that the stress concentration coefficient of surrounding rock is between 1.5 and 3, and it is significantly negative correlated with bifurcated angle below 45°, while the negative correlation become weak gradually with bifurcated angle over 45°. Thus, bifurcated angle should be more than 45°, and the area with serious deformation in bifurcation roadway surrounding rock must be supported emphasisly in the practical engineering.

关 键 词：大断面巷道 硬岩 分叉巷道 分叉角度 围岩变形 数值模拟 

分 类 号：TD322[矿业工程—矿井建设]