复杂受压条件下不同尺寸煤柱破坏倾向性研究.pdf

第32 卷 第4 期 采矿与安全工程学报 Vol.32 No.4 2015 年07 月 Journal of Mining Safety Engineering July 2015 文章编号：1673-3363-(2015)04-0592-051 复杂受压条件下不同尺寸煤柱破坏倾向性研究 何耀宇，宋选民，赵金昌 (太原理工大学采矿工艺研究所，矿业工程学院，山西 太原 030024) 摘要 以煤柱现场受压实际条件为依据，基于岩体破坏压剪和拉伸特征，通过理论分析建立煤柱 压剪破坏和拉伸破坏危险性指标，采用数值模拟方法分析不同宽高比条件下复杂受压煤柱危险性 指标分布规律及煤柱破坏倾向性特征。研究发现：随着煤柱宽度增加，压剪破坏倾向性依次呈现 椭圆型、 “X ”+半椭圆型、半椭圆+双漏斗型、半椭圆+双梯形型结构特征；拉伸破坏倾向性呈 现双曲线似矩形型、 “X ”+半椭圆型、双漏斗型、似双梯形型结构特征。煤柱宽高比对危险性指 数的影响具有阶段性，呈现影响剧烈、平缓和零影响3 个阶段，煤柱受压时最大主应力分布存在 明显端头效应，且服从圣维南原理。 关键词 煤柱；破坏倾向性；危险指数；数值计算 中图分类号 TD 712 文献标志码 A DOI 10.13545/j.cnki.jmse.2015.04.011 A study on damage proneness of coal pillars of different sizes under complicated compression conditions HE Yaoyu ，SONG Xuanmin，ZHAO Jinchang (Institute of Mining Technology，College of Mining Engineering，Taiyuan University of Technology ， Taiyuan，Shanxi 030024，China) Abstract Depending on actual compression conditions of on-site coal pillars, based on the character- istics of compression shear and tensility of rock mass damages, risk indexes of compression shear fail- ures and tensile failures of coal pillars have been established through theoretical analysis, and the study has also analyzed the distribution laws of risk indexes of complicated compressed coal pillars and dam- age proneness characteristics of coal pillars, by adopting the method of numerical simulation, under conditions of different width-height ratios. The study has found that with the increase of coal pillar width, the compression-shear damage proneness, in turn, presents the characteristic