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Weakening behavior of waterproof performance in joints of shield tunnels under adjacent constructions

Frontiers of Structural and Civil Engineering 2023年第6期17卷 884-900页

作者： Huai-Na WU Lei LIU Yuan LIU Ren-Peng CHEN Hai-Lin WANG Shi-Qiang RUAN Meng FAN Research Center of Underground Space Advanced Technology Hunan UniversityChangsha410082China Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education Hunan UniversityChangsha410082China Department of Civil Engineering Hunan UniversityChangsha410082China Hunan Provincial Communications Planning Survey&Design Institute Co.Ltd.Changsha410082China

Groundwater leakage in shield tunnels poses a threat to the safety and durability of tunnel structures. Disturbance of adjacent constructions during the operation of shield tunnels frequently occurs in China, leading to deformation of tunnel lining and leakage in joints. Understanding the impact of adjacent constructions on the waterproofing performance of the lining is critical for the protection of shield tunnels. In this study, the weakening behavior of waterproof performance was investigated in the joints of shield tunnels under transverse deformation induced by adjacent construction. First, the relationship between the joint opening and transverse deformation under three typical adjacent constructions (upper loading, upper excavation, and side excavation) was investigated via elaborate numerical simulations. Subsequently, the evolution of the waterproof performance of a common gasket with a joint opening was examined by establishing a coupled Eulerian-Lagrangian model of joint seepage, and a formula describing the relationship between waterproof performance and joint opening was proposed. Finally, the weakening law of waterproofing performance was investigated based on the results of the aforementioned studies. It was determined that the joints with the greatest decline in waterproof performance were located at the tunnel shoulder in the upper loading case, tunnel crown in the upper excavation case, and tunnel shoulder in the side excavation case. When the waterproof performance of these joints decreased to 50% and 30%, the transverse deformations were 60 and 90 mm under upper loading, 90 and 140 mm under upper excavation, and 45 and 70 mm under side excavation, respectively. The results provide a straightforward reference for setting a controlled deformation standard considering the waterproof performance.

关键词： shield tunnel waterproof performance horizontal transverse deformation joint opening weakenning behavior

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Design Modification of Vehicle Body Structure for Wiper System waterproof performance

Design Modification of Vehicle Body Structure for Wiper Syst...

引用

2021中国汽车工程学会年会暨展览会

作者： Yan Jianrong Zhu Kongying Huang Xiaolong Chen Kaihang Dongfeng Motor Co. LtdDongfeng Nissan Passenger Vehicle CompanyPassenger Vehicle Technical Center

Taking the wiper system of a vehicle as the research object,the overall waterproof performance of the wiper system is *** the CFD simulation software PreonLab to simulate the water flow under the condition of car washing,and the waterproof failure state of the wiper system is *** with the simulation analysis and vehicle experiment,the drainage effect of the vehicle air box is improved,the depth of the water in the air box is reduced,and the waterproof performance of the wiper system is *** water flow simulation analysis of PreonLab can well support the waterproof performance design of wiper system.

关键词： wiper system waterproof performance preonlab water flow

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