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顧鈺雯 ，徐勛倩 ，楊    霄 ，石文康 ，GANHOUEGNON ERIC PATRICK

（南通大學 交通與土木工程學院 ，江蘇 南通 226019)

摘   要： 為探究基坑開挖對鄰近地鐵隧道變形的影響，基于 XGBoost 算法對典型案例中影響地鐵隧道水平變形的因素進行重要度排序統計，提出可用于預測隧道水平變形的經驗公式。通過兩階段分析方法建立地鐵隧道豎向變形理論計算模型： 首先基于Mindlin 解計算考慮基坑坑底及側壁卸荷作用引起的隧道豎向附加應力；進而將隧道視為擱置于 Winkler 地基上 Eular-Bernoulli 無限長梁，引入考慮隧道埋深影響的修正地基基床反力系數，建立隧道豎向變形微分方程進行求解 。文中計算方法與實測數據 、數值模擬結果對比分析結果表明： (1) 本文方法相較于傳統方法計算地鐵隧道的變形精度更高； (2) 在臨近地鐵隧道的基坑施工時，可通過控制基坑與臨近地鐵隧道之間的距離，分塊分層開挖基坑等來控制地鐵隧道的變形。

關鍵詞： 基坑開挖； 隧道變形； 理論解析； 數值模擬； XGBoost 算法

中圖分類號： TU473 ; U451      

文獻標志碼： A       

文章編號： 1005-8249 (2023) 04-0020- 11

 DOI : 10. 19860/j.cnki.issn1005-8249.2023.04.004

GU Yuwen , XU Xunqian , YANG Xiao , SHI Wenkang , GANHOUEGNON ERIC PATRICK  ( School of Transportation and Civil Engineering , Nantong University , Nantong 226019 , China)

Abstract: In order to explore the influence of foundation pit excavation on the adjacent metro tunnels, the importance ranking of the factors affecting the horizontal deformation of tunnels in typical cases were analyzed based on the XGBoost algorithm. Then an empirical formula to predict the horizontal deformation of metro tunnels was proposed. The theoretical calculation model of the vertical deformation of the metro tunnel was established by the two-stage analysis method: Firstly, the Mindlin solution was used to calculate the vertical additional stress of the tunnel caused by the unloading of the foundation pit bottom and side walls. Then, the tunnel was regarded as an Eular-Bernoulli infinite beam on the Winkler foundation. A modified foundation bed reaction coefficient that can take into account the influence of the tunnel burial depth was proposed, and a differential equation for the vertical deformation of the metro tunnel was established. The comparison and analysis results of the calculation method in this paper with the measured data and numerical simulation method show that: (1) Compared with the traditional method, the improved method calculates the deformation of the metro tunnels with higher accuracy; (2) When excavating the foundation pit adjacent to the metro tunnels, the deformation can be controlled by paying attention to the distance between them, and dividing the foundation pit into layers and blocks.

Keywords: foundation pit excavation; deformation of tunnel; theoretic analysis; numerical simulation; XGBoost algorithm 

?基金項目： 南通市科技項目  ( MS22020026 , XG202009-1 ) 。

作者簡介： 顧鈺雯  (1998—) , 女，碩士研究生。研究方向： 城市隧道與地下空間結構工程。 

通信作者： 徐勛倩  (1973—) , 女，博士，教授 。研究方向： 地下空間結構工程。

收稿日期： 2022-07-29