渗流作用下圆形巷道围岩弹塑性分析  

Elastic-plastic Analysis of circular surrounding rock masses under the action of seepage

作　　者：孙珍平[1] 高召宁[1] 孟祥瑞[1] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南232001

出　　处：《矿业安全与环保》2013年第1期32-36,共5页Mining Safety & Environmental Protection

基　　金：国家自然科学基金项目(51074003);国家自然科学基金委员会与神华集团有限公司联合资助项目(51174255);高等学校博士学科点专项科研基金项目新教师类(20093415120001);安徽省优秀青年科技基金项目(10040606Y31);中国博士后科学基金项目(2011M501037);淮南市科技计划项目(2011A07921)

摘　　要：在假设岩体在无限小的区域内材料属性相同,将岩体划分为若干个塑性区域环的情况下,应用统一强度理论,结合岩石应变软化力学模型与围岩峰后强度和变形演变规律,推导了渗流作用下圆形巷道围岩破裂分区的计算公式,分析了渗流作用下巷道围岩的弹性区、塑性软化区和破裂区的力学性态。结合具体算例,对比分析了渗流作用下和无渗流作用下巷道塑性区范围影响因素,得出支护反力、巷道半径以及采深对渗流作用下的巷道塑性区域影响尤为明显。研究表明,考虑渗流作用使得分析结果更加接近于实际,能显示出巷道围岩变化破坏情况,为地下工程的优化支护设计及安全性评价提供理论依据。Based on the assumption that the material property of rock mass was unchangeable in a small region, the rock mass was divided into some plastic zone rings. By using the unified strength theory and in combination with the rock strain-softening mechanic model, the post-peak strength and deformation evolution law of surrounding rock, the calculation formula for the zonal disintegration of the circular surrounding rock mass under the action of the seepage was derived, and the mechanical behaviors of the circular tunnel＇s elastic zone, the plastic-softening zone and ruptured zone under the action of the seepage were analyzed. Through calculation, comparative analysis was made on the influence factors in the range of the plastic zone with and without the action of seepage, and it came a conclusion that the supporting pressure, tunnel radius and mining depth had very remarkable influence on the range of the circular tunnel＇ s elastic zone under the action of seepage. The study indicated that the analysis results were much closer to the practice and can embody the damage process of the surrounding rocks, so it provided a theoretical basis for the optimization of support design and safety evaluation of underground engineering.

关 键 词：渗流作用 塑性区域环 应变软化 破裂分区 

分 类 号：TD322[矿业工程—矿井建设]