顾及沉积岩应变强化与扩容效应的围岩弹塑性力学状态理论分析  

Analytical Research for Elastoplastic Mechanical Response Considering Strain-Hardening and Dilatancy of Sedimentary Rock

作　　者：唐胜兰[1,2] 俞缙[1,2] 张建智[1,2] 周雨晴[1,2] 

机构地区：[1]华侨大学福建省隧道与城市地下空间工程技术研究中心,福建厦门361021 [2]华侨大学土木工程学院,福建厦门361021

出　　处：《华侨大学学报（自然科学版）》2016年第6期691-697,共7页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51374112);福建省自然科学基金资助项目(2014J01160);福建省高校新世纪优秀人才支持计划项目(2015年度)

摘　　要：根据非关联流动法则与中主应力表达式,顾及沉积岩应变强化和扩容效应,推导基于幂强化-理想塑性本构模型和Drucker-Prager屈服准则的应力、位移、塑性区半径的解析解.将文中解、幂强化解、幂强化-理想塑性解进行比较,分析幂强化指数与扩容角对解析解的影响规律.结果表明:幂强化指数对围岩稳定性有较大的影响;扩容程度的变化对围岩应力和位移的影响随着扩容角及原岩应力的增加而增大;当隧洞围岩受到应变强化和扩容效应共同影响时,幂强化指数与扩容角越大,隧洞围岩位移越为敏感,对围岩稳定十分不利.Analytical solutions of stress,displacement and plastic zone radius are obtained with power-hardening model based on Drucker-Prager failure criterion,which adopts the intermediate principal stress expression and non-associated flow rule,and the dilatancy effect is took into account.The paper compares the results of dilatant power hardening-perfectly plastic model and power-hardening model,power hardening-perfectly plastic model respectively,the influence of power-hardening index and dilatancy angle on analytical solutions of surrounding rock are discussed.The results show that the effect of power-hardening index is of great impact on the stability of surrounding rock,the influence of dilatancy extent on the surrounding rock stress and displacement increases as the dilation angle and in-situ stress increase.The tunnel surrounding rock is affected by both the strain-hardening effect and the dilatancy effect,when the power-hardening index and dilatancy angle increase,the displacement is more sensitive,which is unfavorable to the tunnel stability.

关 键 词：隧道工程 弹塑性解 中主应力 扩容 幂强化模型 

分 类 号：TU452[建筑科学—岩土工程]