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渗流作用下圆形巷道围岩弹塑性分析

发表时间:2012-03-31  浏览量:1030  下载量:506
全部作者: 高召宁,孙珍平,孟祥瑞
作者单位: 安徽理工大学能源与安全学院
摘 要: 假设岩体在无限小的区域范围内材料属性相同,将岩体划分为若干个塑性区域环。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,推导渗流作用下圆形巷道围岩破裂分区,分析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范围影响尤为明显。研究表明:考虑渗流作用使得分析结果更加接近实际,能显示出巷道围岩较真实的变化破坏情况,为地下工程的优化支护设计及安全性评价提供理论依据。
关 键 词: 采矿工程;渗流;塑性区域环;应变软化;破裂分区
Title: Elastic-plastic analysis of circular surrounding rock masses under the action of seepage
Author: GAO Zhaoning, SUN Zhenping, MENG Xiangrui
Organization: School of Mining and Safety, Anhui University of Science and Technology
Abstract: The paper assumes that the rock mass material properties kept unchangeable in a sufficiently small region. The rock mass is divided into some plastic rings. Basing on the plane strain condition, the unified strength theory is applied, combining with the rock strain-softening mechanic model and the post-peak strength of rock and deformation evolution law, the zonal disintegration is gotten in circular surrounding rock masses under the action of the seepage. Mechanical behaviors of a circular tunnel elastic zone, plastic-softening zone and ruptured zone have been analyzed under the action of the seepage. Through comparing the influence factors of the range of the plastic zone under the conditions with/without the plastic zone under the action of seepage, it’s obtained that the especially remarkable influence factors on seepage under the action of the plastic area are the supporting pressure, tunnel radius and mining depth. The data show that the result analysis is increasingly close to reality with considering the seepage; it also demonstrates a real change of the surrounding rock damage. The results provide a theoretical base for the optimization of the underground engineering support design and safety evaluation.
Key words: mineral engineering; seepage; plastic zone ring; strain softening; zonal disintegration
发表期数: 2012年3月第6期
引用格式: 高召宁,孙珍平,孟祥瑞. 渗流作用下圆形巷道围岩弹塑性分析[J]. 中国科技论文在线精品论文,2012,5(6):507-515.
 
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