既有转弯区隧道双侧超大深基坑开挖变形规律分析

孙阳军; 贾飞; 李伟杰; 石林; 何彦伟; 秦杏春; 姜鉴晖; 李世宇

doi:10.3724/j.gyjzG23062103

既有转弯区隧道双侧超大深基坑开挖变形规律分析

doi: 10.3724/j.gyjzG23062103

1. 陕西建工机械施工集团有限公司, 西安 710000;
2. 陕西建工基础建设集团有限公司, 西安 710000;
3. 东北大学资源与土木工程学院, 沈阳 110819

基金项目:

中央高校基本科研业务费（N180701005）。

详细信息

作者简介:
孙阳军，高级工程师，主要从事岩土工程相关领域研究。

通讯作者:
石林,工程师,主要从事土木工程相关领域研究,1041618841@qq.com。

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出版历程
- 收稿日期: 2023-06-21
- 网络出版日期: 2026-01-06

Analysis on Deformation Law of Double Side Extra Large Deep Foundation Pit Excavation in Existing Turning Area Tunnels

1. SCEGC Mechanized Construction Group Company Ltd., Xi'an 710000, China;
2. SCEGC Foundation Construction Engineering Group Company Ltd., Xi'an 710000, China;
3. School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China

摘要

摘要: 为掌握黄土地区既有隧道转弯区两侧超大深基坑开挖与支护变形规律，以西安咸阳国际机场三期扩建工程为研究背景，对基坑开挖全过程进行数值模拟分析，深入探究黄土地区超大深基坑开挖对基坑侧壁、既有转弯隧道和地表变形的影响规律。研究发现：1）衬砌结构的水平位移与竖向位移表现出“前部大、后部小”的特征，且弯曲方向侧衬砌结构变形较大；2）基坑侧壁变形以拐角远端顶部为中心向地下连续墙连接方向呈放射型扩散；3）随着沿隧道距离的增加，衬砌结构上部地表变形曲线形式由“U”型向“W”型转变。因此，在工程施工过程中，应重点监测弯曲方向侧衬砌结构、拐角远端顶部变形和基坑附近地表变形差。
- 超大深基坑 /
- 隧道转弯 /
- 基坑变形 /
- 地表变形 /
- 黄土地区
Abstract: To clarify the deformation laws of excavation and support of super deep foundation pits on both sides of existing tunnel turning areas in loess areas. Based on the third phase expansion project of Xi’an Xianyang International Airport， this paper conducts a numerical simulation analysis of the whole process of foundation pit excavation， and deeply explores the influence of the excavation of super deep foundation pit in the loess area on the foundation pit side wall， the existing turning tunnel and the surface deformation. Through research， it was found that： 1） the horizontal and vertical displacements of the lining structure exhibit the characteristics of “large front and small rear”， and the deformation of the lining structure in the bending direction is relatively large； 2） the deformation of the side wall of the foundation pit diffuses radially from the top of the far corner to the connection direction of the slurry wall； 3） as the distance along the tunnel increases， the deformation curve of the upper surface of the lining structure changes from a “U” shape to a “W” shape. 4） during the construction process， it is important to focus on monitoring the lining structure in the bending direction， the deformation of the far end top of the corner， and the difference in surface deformation near the foundation pit.
- extra-large deep foundation pit /
- tunnel turning /
- foundation pit deformation /
- surface deformation /
- loess region

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