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Study on the deformation of existing tunnel under the combined effect of pit excavation and dewatering based on the Kerr foundation model
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-20 , DOI: 10.1016/j.tust.2025.106382
Meng Fei, Qiao Shifan

There is a significant progression towards the trend of significant depth and extensive scale in foundation pit construction, where the excavation range is large and dewatering measures are usually required. To overcome the shortcomings associated with the complexity of the 3D numerical analysis model and the long period of on-site measurement in existing studies, a two-stage analysis method is proposed to consider the impacts on existing tunnels under the combined effects of pit excavation and dewatering. The first step involves calculating the additional stress imposed on the existing tunnel under the construction of pit bottom, pit side, and dewatering. Secondly, a differential equation describing the deformation effects on the existing tunnel is established based on the Kerr foundation model. Finally, the control equation is solved using the Galerkin method. Three engineering cases with different locations and tunnel parameters are selected to validate the proposed method. The effects of various factors on the deformation of the existing tunnel under the influence of pit excavation and dewatering are analyzed. Subsequently, an orthogonal experiment is designed to analyze the significant factors influencing the deformation of the existing tunnel and their prioritization, and an optimal parameter combination for controlling the existing tunnel deformation is obtained.

中文翻译:


基于 Kerr 基础模型的既有隧道开挖降水联合作用下隧道变形研究



在基坑施工中,基坑施工朝着显著深度和大规模的趋势取得了重大进展,其中挖掘范围很大,通常需要采取脱水措施。为克服现有研究中三维数值分析模型复杂、现场测量时间长等缺点,提出了一种两阶段分析方法,考虑基坑开挖和降水综合作用下对既有隧道的影响。第一步涉及计算在坑底、坑侧和排水施工下施加在现有隧道上的额外应力。其次,基于 Kerr 地基模型建立了描述变形对既有隧道变形影响的微分方程;最后,使用 Galerkin 方法求解控制方程。选取 3 个不同位置和隧道参数的工程案例对所提方法进行了验证。分析了各种因素在基坑开挖和脱水影响下对既有隧道变形的影响。随后,设计了正交试验,分析了影响既有隧道变形的重要因素及其优先级,得到了控制既有隧道变形的最优参数组合。
更新日期:2025-01-20
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