土木与环境工程学报（中英文）2026，Vol.48Issue(2)：121-129,9.DOI:10.11835/j.issn.2096-6717.2024.090
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
摘要
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
基坑降水/地表沉降/空间效应/非平衡堆载/数值模拟Key words
foundation pit dewatering/surface settlement/spatial effect/non-equilibrium loading/numerical simulation分类
建筑与水利引用本文复制引用
梁新欢,迟民良,何小辉,王安华,徐长节,杨开放..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（中英文）,2026,48(2):121-129,9.基金项目
国家自然科学基金(52238009) （52238009）
江西省重点研发计划(20223BBG71018) （20223BBG71018）
南昌轨道交通集团科研项目(2020HGKYB008) National Natural Science Foundation of China(No.52238009) （2020HGKYB008）
Key Research and Development Program of Jiangxi Province(No.20223BBG71018) （No.20223BBG71018）
Nanchang Rail Transit Group Research Project(No.2020HGKYB008) （No.2020HGKYB008）
