Deformation analysis of ground and existing tunnel induced by overlapped curved shield tunneling  

作　　者：Yingnan Liu Huayang Lei Liang Shi Gang Zheng Mengting Wang 

机构地区：[1]School of Civil Engineering,Tianjin University,Tianjin,300350,China [2]Institut für Geotechnik,Universitat für Bodenkultur Wien,Feistmantelstrasse 4,Vienna,1180,Austria [3]Key Laboratory of Coast Civil Structure Safety of the Ministry of Education,Tianjin University,Tianjin,300350,China [4]Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration(Tianjin University),Tianjin,300350,China [5]State Key Laboratory of Hydraulic Engineering Simulation and Safety(Tianjin University),Tianjin,300350,China [6]Institute of Geological Survey,China University of Geosciences,Wuhan,430074,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第2期795-809,共15页岩石力学与岩土工程学报(英文)

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.52078334);the National Key Research and Development Program of China(Grant No.2017YFC0805402);the Tianjin Research Innovation Project for Postgraduate Students(Grant No.2021YJSB141).

摘　　要：The deformation caused by tunnel excavation is quite important for safety,especially when it is adjacent to the existing tunnel.Nevertheless,the investigation of deformation characteristics in overlapped curved shield tunneling remains inadequate.The analytical solution for calculating the deformation of the ground and existing tunnel induced by overlapped curved shield tunneling is derived by the Mirror theory,Mindlin solution and Euler-Bernoulli-Pasternak model,subsequently validated through both finite element simulation and field monitoring.It is determined that the overcutting plays a crucial role in the ground settlement resulting from curved shield tunneling compared to straight shield tunneling.The longitudinal settlement distribution can be categorized into five areas,with the area near the tunnel surface experiencing the most dramatic settlement changes.The deformation of the existing tunnel varies most significantly with turning radius compared to tunnel clearance and grouting pressure,especially when the turning radius is less than 30 times the tunnel diameter.The tunnel crown exhibits larger displacement than the tunnel bottom,resulting in a distinctive‘vertical egg'shape.Furthermore,an optimized overcutting mode is proposed,involving precise control of the extension speed and angular velocity of the overcutting cutter,which effectively mitigates ground deformation,ensuring the protection of the existing tunnel during the construction.

关 键 词：Overlapped curved shield tunneling Analytical solution Ground deformation Existing tunnel Overcutting mode 

分 类 号：U45[建筑科学—桥梁与隧道工程]