Numerical Study on the Reinforcement Measures of Tunneling on Adjacent Piles

Symmetry

Chuanbang Fu¹  Mo’men Ayasrah²  Hongsheng Qiu³  Zhe Wang³  Luo Gang³ 

[1] China Municipal Engineering Zhongnan Design & Research Institute Co., Ltd., Haikou 570105, China;Communication and Transportation Engineering, School of Transportation, Wuhan University of Technology, Wuhan 430063, China;School of Transportation and Logistics Engineering, Wuhan University of Technology, Wuhan 430063, China;

关键词: tunnel construction;    numerical simulations;    adjacent piles;    grouting reinforcement;    isolation pile;   

DOI  :  10.3390/sym14020288

来源: DOAJ

【 摘 要 】

Tunnel construction will inevitably change the surrounding soil’s original stress and displacement fields, affecting the surrounding piles. In addition, the lateral displacement of the soil at the subway tunnel’s face is symmetrically distributed along the tunnel’s central axis, which is greater in the center and smaller on both sides. Therefore, the protection of existing piles and providing a reasonable reinforcement plan have become the focus of attention. Taking a section of Tianjin Metro Line 3 as the research object, this paper studies the influence of the shield tunnel excavation process on the existing pile foundation through three-dimensional finite element simulation. The model has been verified through field monitoring data. Then, parameter analysis has been carried out for two reinforcement measures: grout reinforcement and isolation pile construction. According to the research results, the impact of shield construction on the pile foundation is mainly within the range of twice tunnel diameter to the pile foundation from the front and back of the tunnel face. In addition, the grouting reinforcement has better control of the vertical displacement of the existing pile foundation. The construction of isolation piles can better control the lateral displacement of the existing pile foundation. Have certain reference significance for similar projects.

【 授权许可】

Unknown