考虑损伤和不均匀冻胀的寒区隧道弹塑性统一解  

Unified Elasto-Plastic Solution for Cold Regions Tunnel Considering Damage and Non-Uniform Frost Heave

作　　者：蒋望涛 姜海强 马勤国 李永东 李治国 JIANG Wangtao;JIANG Haiqiang;MA Qinguo;LI Yongdong;LI Zhiguo(School of Civil Engineering and Transportation/State Key Laboratory of Subtropical Building Science/South China Institute of Geotechnical Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;China Railway Tunnel Consultants Co.,Ltd.,Guangzhou 511400,Guangdong,China)

机构地区：[1]华南理工大学土木与交通学院/亚热带建筑科学国家重点实验室/华南岩土工程研究院,广东广州510640 [2]中铁隧道勘察设计研究院有限公司,广东广州511400

出　　处：《华南理工大学学报（自然科学版）》2022年第1期69-79,100,共12页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金青年基金资助项目(41901074);广东省自然科学基金资助项目(2020A1515010745);华南理工大学中央高校基本科研业务费资助项目(2019MS119);中铁隧道局重大科研项目(201805)。

摘　　要：寒区隧道弹塑性解的分析能为寒区隧道稳定性研究提供依据。为此,考虑围岩不均匀冻胀特性建立弹塑性损伤力学计算模型,基于统一强度理论求解得到寒区隧道弹塑性应力场和位移场统一解,并对所得解进行验证和参数分析。结果表明:忽略围岩塑性损伤及体积冻胀率的寒区隧道弹塑性解偏于保守;考虑不均匀冻胀特性能准确地反映寒区隧道围岩的真实冻胀程度;考虑中间主应力效应能有效发挥冻结围岩的承载潜能;损伤程度比值λ/E_(f)、体积冻胀率ξ_(V)、不均匀冻胀系数k、统一强度理论参数b、初始地应力p_(0)以及位移释放系数η等参数对衬砌上径向应力σ_(f)和塑性半径rp影响显著,应合理考虑不同参数在寒区隧道工程中的影响。该研究成果可为寒区隧道工程设计提供理论参考。The analysis of elasto-plastic solution can provide a basis for the stability research of cold regions tunnel.Therefore,the elasto-plastic damage mechanics calculation model was established by considering the non-uniform frost heave of surrounding rock.The unified analytical solutions of elasto-plastic stress field and displacement field of cold regions tunnel were derived based on the unified strength theory,and the unified solutions were verified and the parameters were analyzed.The results show that,by neglecting plastic damage and volume frost heave ratio of surrounding rock,the elasto-plastic solution of cold regions tunnel tends to be conservative,and the actual frost heave degree of surrounding rock for cold regions tunnel can be more accurately reflected by considering the non-uniform frost heave.In addition,the potential strength of frozen surrounding rock can be effectively improved by considering the intermediate principal stress effect.The radial stressσf of lining and plastic radius r_(p) of tunnel are significantly influenced by parameters such as damage degree ratioλ/E_(f),volume frost heaving ratioξ_(V),coefficient of non-uniform frost heaving k,unified strength theoretical parameter b,initial ground stress p_(0) and displacement release coefficientη.Hence,the influence of different parameters on tunnel engineering in cold regions should be reasonably analyzed.The research results can provide theoretical reference for engineering design of cold regions tunnel.

关 键 词：寒区隧道 损伤 不均匀冻胀 弹塑性 统一强度理论 中间主应力效应 

分 类 号：TU457[建筑科学—岩土工程]