Dynamic response of subway shield tunnel structure under differential deformation
LIU Jianwen1, SHI Chenghua1, LEI Mingfeng1,2, PENG Limin1, LI Xiang1, CAO Chengyong1地基沉降、临近施工扰动导致的工后差异变形广泛存在于我国已建地铁盾构区间隧道中，对服役期内隧道结构性能造成不利影响。基于赫兹非线弹性接触理论模拟轮轨接触关系，考虑车辆、轨道、隧道、围岩的空间结构特征和相互接触关系，建立了车-轨-隧-围岩一体化计算模型，计算了基坑开挖致使盾构隧道隆起变形后列车运行引起的结构动力响应。结果表明：隧道隆起变形加剧了轨道结构和隧道结构的动力响应，基坑边缘和中心位置处的衬砌环接头混凝土动应力变化较为剧烈，衬砌拱顶、拱底处的纵向接头螺栓剪力受影响较大，而拱腰处的环向螺栓内力变化幅度显著。#br# #br# 关键词：#br# 地铁盾构隧道；车-轨-隧-围岩一体化模型；差异变形；动力响应
1.School of Civil Engineering, Central South University, Changsha 410075, China;
2.MOE Key Lab of Heavy Haul Railway Engineering Structure, Central South University, Changsha 410075, China
Abstract：The differential deformation after construction caused by foundation settlement and adjacent construction disturbance widely exists in the existing metro shield tunnels in China, it has adverse effects on tunnel structural performance during tunnel service period.Based on Hertz non-linear elastic contact theory to simulate wheel-rail contact relationship, considering spatial structure characteristics and mutual contact relationship of vehicle, track, tunnel and surrounding rock, an integrated calculation model of vehicle-rail-tunnel-surrounding rock was established, and the structural dynamic response caused by train operation after shield tunnel heave deformation caused by foundation pit excavation was calculated.The results showed that the tunnel heave deformation aggravates dynamic responses of track structure and tunnel structure; dynamic stress of lining ring joint concrete at edge and center of foundation pit changes sharply; shear force of longitudinal joint bolt at top and bottom of lining arch is greatly affected, while internal force of circumferential bolt at arch waist changes significantly.
刘建文1，施成华1，雷明锋1,2，彭立敏1，李翔1，曹成勇1. 差异变形下地铁盾构隧道结构动力响应研究[J]. 振动与冲击, 2021, 40(9): 212-220.
LIU Jianwen1, SHI Chenghua1, LEI Mingfeng1,2, PENG Limin1, LI Xiang1, CAO Chengyong1. Dynamic response of subway shield tunnel structure under differential deformation. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(9): 212-220.
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