地面堆载下盾构隧道结构韧性演化规律研究  

Resilience evolution of shield tunnel structures under ground surcharge

作　　者：朱旻 陈湘生[1,2,3] 夏长青 王琛[1,2,3] 包小华[1,2,3] ZHU Min;CHEN Xiangsheng;XIA Changqing;WANG Chen;BAO Xiaohua(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;Key Laboratory of Coastal Urban Resilient Infrastructure(MOE),Shenzhen University,Shenzhen 518060,China;Underground Polis Academy,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]深圳大学土木与交通工程学院,广东深圳518060 [2]深圳大学滨海城市韧性基础设施教育部重点实验室,广东深圳518060 [3]深圳大学未来地下城市研究院,广东深圳518060

出　　处：《岩土工程学报》2024年第1期35-44,共10页Chinese Journal of Geotechnical Engineering

基　　金：深圳市科技创新委员会项目(20220810144837004);国家自然科学基金青年基金项目(52008263,52108329);国家自然科学基金重大项目(52090084);深圳市科技计划项目(KQTD20200909113951005)。

摘　　要：韧性理论的提出和发展为盾构隧道结构性能评估提供了新思路。在提出考虑历史最大变形的衬砌性能指标基础上,建立包含管片、接头和非线性土弹簧的精细化三维有限元分析模型,研究了地面堆卸载作用下,不同埋深盾构隧道结构响应特征和韧性演化规律。结果表明:地面堆载下拱顶、拱底内弧面受拉,拱腰外弧面受拉,受错缝拼装影响,结构内力和损伤集中于边环纵缝相邻的中环管片处;卸载阶段隧道水平收敛减小,完全卸载后的残余变形随堆载量增加而增大,相同水平收敛情况下浅埋隧道卸载后变形恢复率大;隧道结构韧性随着水平收敛的增大快速降低,而缩短响应时间、提高修复措施效率可以提升隧道结构韧性;将隧道结构韧性分为4个等级,当结构进入极低韧性阶段时,应采取更加高效快速的综合修复方案,同时避免造成结构的二次损伤。The proposition and development of the resilience theory provide a new way for the performance evaluation of shield tunnel structures.On the basis of the proposed lining performance index considering the maximum historical deformation,a refined 3D finite element model including segments,joints,and nonlinear soil springs is established.The structural response and resilience evolution of shield tunnels with different buried depths under surcharge and unloading are studied.The results show that under the ground surcharge,the inner surfaces at the arch crown and arch bottom,as well as the outer surface at the arch waist,are tensioned.Affected by staggered joints,the structural internal force and damage are more concentrated in the segment of the central ring adjacent to the longitudinal joint of the side ring.At the unloading stage,the horizontal convergence of the tunnel decreases,and the residual deformation after complete unloading increases with the increase of the surcharge.Under the same horizontal convergence,the deformation recovery rate of the shallow burial tunnels after unloading is greater.The resilience of the tunnel structures decreases quickly with the increase in the horizontal tunnel convergence,and shortening response time and improving the efficiency of repair measures can help enhance the resilience of the tunnel structures.While the resilience of the tunnel structures is divided into four levels,more efficient,rapid and comprehensive repair measures should be adopted to avoid the secondary damage to the structures when entering the extremely low resilience stage.

关 键 词：盾构隧道 韧性 地面堆载 衬砌性能 水平收敛 

分 类 号：TU45[建筑科学—岩土工程]