Spatial effect of surface settlement during excavation and dewatering under non-equilibrium loading

LIANG Xinhuan; CHI Minliang; HE Xiaohui; WANG Anhua; XU Changjie; YANG Kaifang

doi:10.11835/j.issn.2096-6717.2024.090

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Spatial effect of surface settlement during excavation and dewatering under non-equilibrium loading

Civil Engineering | 更新时间：2026-03-30

- Spatial effect of surface settlement during excavation and dewatering under non-equilibrium loading
- Journal of Civil and Environmental Engineering Vol. 48, Issue 2, Pages: 121-129(2026)
- 作者机构：
  
  1.南昌轨道交通集团有限公司，南昌 330038
  2.浙江大学滨海和城市岩土工程研究中心，杭州 310058
  3.华东交通大学轨道交通基础设施性能监测与保障国家重点实验室，南昌 330013
  4.浙大城市学院工程学院，杭州 310015
- 作者简介：
  
  LIANG Xinhuan (1981- ), senior engineer, main research interest: foundation pit engineering, E-mail: 1979118134@qq.com.
  XU Changjie （corresponding author）， professor， doctorial supervisor， E-mail： 2557587237@qq.com.
- 基金信息：
  
  National Natural Science Foundation of China(52238009);Key Research and Development Program of Jiangxi Province(20223BBG71018);Nanchang Rail Transit Group Research Project(2020HGKYB008)
- DOI：10.11835/j.issn.2096-6717.2024.090
  CLC： TU46
- Received：03 July 2024，
  
  Published：25 April 2026
- 稿件说明：
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梁新欢,迟民良,何小辉等.非平衡堆载作用下基坑降水开挖地表沉降的空间效应[J].土木与环境工程学报,2026,48(02):121-129.

LIANG Xinhuan,CHI Minliang,HE Xiaohui,et al.Spatial effect of surface settlement during excavation and dewatering under non-equilibrium loading[J].Journal of Civil and Environmental Engineering,2026,48(02):121-129.
梁新欢,迟民良,何小辉等.非平衡堆载作用下基坑降水开挖地表沉降的空间效应[J].土木与环境工程学报,2026,48(02):121-129. DOI： 10.11835/j.issn.2096-6717.2024.090.

LIANG Xinhuan,CHI Minliang,HE Xiaohui,et al.Spatial effect of surface settlement during excavation and dewatering under non-equilibrium loading[J].Journal of Civil and Environmental Engineering,2026,48(02):121-129. DOI： 10.11835/j.issn.2096-6717.2024.090.

摘要

为研究非平衡堆载作用下地铁基坑降水开挖过程中不同特征剖面处地表沉降的空间效应特性，以南昌市某地铁车站基坑工程为背景，利用PLAXIS 3D建立三维数值模型进行模拟，模拟值与实测值吻合良好，验证了数值模拟的准确性。通过改变非平衡堆载大小和降水开挖工况，研究狭长基坑在分步降水开挖与一次性降水开挖情况下不同堆载作用对坑外地表沉降的影响规律，并进一步探讨坑外不同特征剖面地表沉降的空间效应特性。结果表明：受非平衡堆载影响，近堆载侧地表沉降大于远堆载侧；相较于一次性降水开挖工况，分步降水开挖工况下坑外各特征剖面处地表沉降值均更小；两种降水开挖工况下，非平衡堆载均弱化了近堆载侧地表沉降的空间效应，而对远堆载侧地表沉降空间效应的影响则相反，这与非平衡堆载和分段分层开挖的共同作用有关。

Abstract

In order to study the spatial effect characteristics of surface settlement at different characteristic profiles during dewatering excavation of subway pits under non-equilibrium loading

a subway station pit project in Nanchang is taken as the background

and a three-dimensional numerical model is established with PLAXIS 3D for simulation. The simulated values demonstrate a strong correlation with the measured values

which verifies the efficacy of numerical simulation. By altering the magnitude of the non-equilibrium loading and dewatering excavation conditions

the impact of different loadings on the settlement outside the pit under step-by-step and one-time dewatering excavation conditions was studied. Additionally

the spatial effect characteristics of settlement at various characteristic profiles were analyzed. The spatial effects of surface settlement outside the pit under different non-equilibrium loading and dewatering schemes were discussed. The findings indicate that due to the influence of non-equilibrium loading

the settlement on the side close to the loading is greater than that on the side far from the loading. In comparison with the one-time dewatering excavation condition

the settlement values at each characteristic profile outside the pit are reduced under the step-by-step dewatering excavation condition. Under both dewatering excavation conditions

the non-equilibrium loading weakens the spatial effect of settlement on the side near the loading. Conversely

the effect on the spatial effect of the settlement on the side far from the loading is the opposite

which is related to the combined effect of non-equilibrium loading and segmented excavation.

关键词

Keywords

references

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