岩土工程学报2024，Vol.46Issue(1)：35-44,10.DOI:10.11779/CJGE20221258
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
摘要
Abstract
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Key words
shield tunnel/resilience/ground surcharge/lining performance/horizontal convergence分类
建筑与水利引用本文复制引用
朱旻,陈湘生,夏长青,王琛,包小华..地面堆载下盾构隧道结构韧性演化规律研究[J].岩土工程学报,2024,46(1):35-44,10.基金项目
深圳市科技创新委员会项目(20220810144837004) （20220810144837004）
国家自然科学基金青年基金项目(52008263,52108329) （52008263,52108329）
国家自然科学基金重大项目(52090084) （52090084）
深圳市科技计划项目(KQTD20200909113951005) （KQTD20200909113951005）
