非平衡堆载作用下基坑降水开挖地表沉降的空间效应
Spatial effect of surface settlement during excavation and dewatering under non-equilibrium loading
- 土木与环境工程学报 2026年48卷第2期 页码：121-129
- 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：
梁新欢（1981- ），男，高级工程师，主要从事基坑工程研究，E-mail：1979118134@qq.com。
徐长节（通信作者），男，教授，博士生导师，E-mail：2557587237@qq.com。
- 基金信息：国家自然科学基金(52238009);江西省重点研发计划(20223BBG71018);南昌轨道交通集团科研项目(2020HGKYB008)
DOI：10.11835/j.issn.2096-6717.2024.090
中图分类号： TU46收稿：2024-07-03，
纸质出版：2026-04-25
- 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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