应变非线性软化的圆形硐室围岩荷载-位移关系研究

英文篇名：Research on relationship of load-displacement for cavern surrounding rock with strain nonlinear softening
中文刊名：岩土力学
英文刊名：Rock and Soil Mechanics
作者：潘岳 ; 王志强
英文作者：PAN Yue ; WANG Zhi-qiang (Department of Civil Engineering.Qingdao Institute of Architecture and Engineering ; Qingdao 266520 ; China)
中文关键词：圆形硐室 ; 非线性软化 ; 围岩平衡方程 ; 围岩压力方程 ; 围岩自承地应力上确界 ; 围岩压力下确界
英文关键词：circular cavern ; nonlinear softening ; equilibrium equation of surrounding rock ; pressure equation of surrounding rock ; superior certain limit of self-support geo-stress of surrounding rock ; inferior certain limit of surrounding rock pressure.
出版日期：2004-10-30
机构：青岛理工大学土木工程学院,青岛理工大学土木工程学院山东青岛266520 ,山东青岛266520
年：2004
期：10
出版单位：岩土力学

摘要

基于峰值应力后具拐点的应变非线性软化本构模型,且同时考虑中间主应力2s,对岩体形变影响的条件下及等压荷载下圆形硐室围岩塑性区应力分布规律、围岩承载机制及围岩与支护之间作用关系进行研究,得到无支护硐室围岩自承地应力上确界{}ossupp、围岩压力下确界{}ainfp等反映实际硐室围岩工作状况的重要概念。给出了{}ossupp、{}ainfp的表达式以及它们与地应力op间的关系式。所得到的塑性区应力、塑性区半径、围岩压力和硐室周边位移等研究结果,与基于理想弹塑性体的Fenner解答相比,要更接近实际硐室围岩中的对应量值。
Under the conditions of according with strain nonlinear softening constitutive model of having inflexion point after peak stress of practical rock and considering rock deformation influence due to intermediate principal stress2s,stress distribution laws of surrounding rock plastic zone of circular cavern under the condition of uniform pressure,the mechanism of load bearing and acting relation between surrounding rock and support are studied. Some important conceptions of working status of practical cavern surrounding rock are obtained;such superior certain limit sup{pos} of self-support geo-stress and inferior certain limit inf{pa} of supportless cavern surrounding rock. The expressions of sup{pos}, inf{pa} and the relation formula between sup{pos}and geo-stress 0p,between inf{pa}and geo-stress p0 are given. The research results of plastic zone stress,plastic zone radius,surrounding rock pressure,and surrounding rock displacement are more nearly actual correspondence values of cavern surrounding rock with Fenner solution based on ideal elastoplastic materials.

引文

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