岩土工程学报2026，Vol.48Issue(6)：1130-1139,10.DOI:10.11779/CJGE20250463
砂土地基深围井开挖坑底回弹与扰动规律数值分析
Numerical analysis of shaft excavation-induced rebound and soil disturbance in deep sand deposit
摘要
Abstract
The analyses of the stress and deformation fields and soil disturbance at the bottom of a pit provide guidance for the shaft design and construction,the geotechnical investigation and field testing in the pit.The small-strain hardening model(HSS)is widely adopted in numerical analysis of excavation problems due to its enhanced capability of considering the nonlinear stiffness-strain relationship of soils in the small strain range.Existing research on HSS model parameters mainly focuses on typical soft soils,with limited studies on sandy ground.This study conducts a series of laboratory tests and calibrates the HSS model parameters for a deep sand ground,and then the shaft excavation-induced rebound and soil disturbance are analyzed by FLAC3D.The results illustrate that the HSS model parameters exhibit notable differences from typical soft soils and the depth dependency;the annular support system effectively restrains the structural deformation during excavation;the excavation-induced unloading effects develop nonlinearly with depth;and the rebound of the excavation predominantly occurs within the loosened zone in the sandy layer and is also affected by the deformation of supporting structure.These findings provide valuable references for the evaluation of deep excavation-induced soil disturbance,and the design and construction of similar annular shafts in deep sandy ground.关键词
深厚覆盖层/砂土地基/小应变硬化模型/深围井开挖/坑底回弹/土体扰动/数值分析Key words
deep deposit/sand ground/HSS model/shaft excavation/rebound/soil disturbance/numerical analysis分类
建筑与水利引用本文复制引用
周燕国,李牧之,彭文明,李建,罗启迅,陈云敏..砂土地基深围井开挖坑底回弹与扰动规律数值分析[J].岩土工程学报,2026,48(6):1130-1139,10.基金项目
国家重点研发计划课题(2024YFF1700901) （2024YFF1700901）
国家自然科学基金面上项目(52278374)This work was supported by the National Key Research and Development Program of China(Grant No.2024YFF1700901)and the National Natural Science Foundation of China(Grant No.52278374). （52278374）
