摘要
目前预测隧道围岩应力和位移的弹塑性解析解大多由加载状态进行推导。而水工隧道通水后应力状态存在卸载,解答应考虑实际应力历史。针对围岩满足统一强度理论、理想弹塑性和非关联流动法则,并考虑开挖阶段掌子面推进效应、支护时机、围岩–衬砌相互作用以及高水压时卸载区再次变塑的情况,根据弹塑性加卸载原理进行水工隧道从开挖到通水运行全阶段的弹塑性解析解推导(塑性区范围、应力、位移和临界水压值)。围岩应力与位移解析解与有限元结果吻合很好。本文解与纯加载路径的解答(传统解)相比发现,传统解低估了洞口实际位移量和塑性区大小。
The current elastoplastic analytical solutions for tunnels were mostly obtained based on the loading path.However,the stress state of the hydraulic tunnel is unloading after the water filling,therefore,the solution should consider the actual stress history.According to the principle of elastic-plastic loading and unloading,the elastoplastic analytical solutions(i.e.,size of plastic zone,stress,displacement and critical water pressure)of hydraulic tunnel are derived for the whole stage from excavation to water filling,considering the advancement of the tunnel face,the interaction between surrounding rock and lining,support time and the re-plasticity of the unloading region under high water pressure.The analytical stress and displacement agree very well with the results from finite element method.Compared the proposed solutions with obtained from the loading path(the traditional solution),it is found that the traditional solution underestimates the displacement and the size of the plastic zone.
作者
付睿聪
王华宁
蒋明镜
杨永恒
FU Ruicong;WANG Huaning;JIANG Mingjing;YANG Yongheng(College of Civil Engineering,Tongji University,Shanghai 200093,China;School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200093,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2021年第S02期3174-3181,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(11872281,51639008)
同济大学土木工程防灾国家重点实验室自主课题(SLDRCE19-A-06)。
关键词
隧道工程
水工隧道
弹塑性解析解:加卸载路径
统一强度理论
tunnelling engineering
hydraulic tunnel
elastoplastic analytical solution
loading and unloading paths
unified strength theory
