Analysis of pipeline deflection and gap formation induced by shield tunnelling based on double-layer winkler foundation
LIN Cungang1，2，3，4，WANG Zhongjie1，2，3，4，GUO Chengchao1，2，3，4，WANG Fuming1，2，3，4，#br#
CHEN Yu1，2，3，4，ZHAO Chenyang1，2，3，DING Zhi5
(1. Guangdong Research Center for Underground Space Exploitation Technology，School of Civil Engineering，Sun Yat-sen University，Guangzhou，Guangdong 510275，China；2. State Key Laboratory for Tunnel Engineering，Guangzhou，Guangdong 510275，China；3. Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)，Zhuhai，Guangdong 519082，China；4. Guangdong Key Laboratory of Marine Civil Engineering，Guangzhou，Guangdong 510275，China；5. Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province，Hangzhou，Zhejiang 310015，China)
Abstract：The assessment of deflection and voiding resulting from shield tunnelling on overlying pipelines is critical for safeguarding their structural integrity. A method for calculating such deflection and voiding during shield tunnel excavation，taking into account variations in stiffness between the pipeline?s overlying and underlying subgrades，was developed using a double-layer Winkler foundation model. Model tests verified its applicability. Conventional subgrade bearing theories for pipelines buried in sand were refined based on plate load tests，providing recommendations for stiffness and ultimate bearing capacity relevant to soil-pipeline interaction during shield tunnelling. Parameter analysis revealed that void width increases with pipeline flexural stiffness and tunneling ground loss，albeit at a decreasing rate. Significantly，under conditions of high ground loss or pipeline flexural stiffness，both the soil-pipeline elastic interaction theory and the single-layer foundation method，considering interface voiding，tend to overestimate pipeline deflection and bending moments. In contrast，the double-layer Winkler foundation method，incorporating interface voiding，delivers a more precise prediction of pipeline deflections.
林存刚1，2，3，4，王忠杰1，2，3，4，郭成超1，2，3，4，王复明1，2，3，4，陈 瑜1，2，3，4，赵辰洋1，2，3，丁 智5. 基于双层Winkler地基的盾构穿越管线挠曲与脱空分析[J]. 岩石力学与工程学报, 0, (): 812-812.
LIN Cungang1，2，3，4，WANG Zhongjie1，2，3，4，GUO Chengchao1，2，3，4，WANG Fuming1，2，3，4，. Analysis of pipeline deflection and gap formation induced by shield tunnelling based on double-layer winkler foundation. , 0, (): 812-812.
