水文地质工程地质2025，Vol.52Issue(1)：85-96,12.DOI:10.16030/j.cnki.issn.1000-3665.202311037
挡墙渗漏对富水砂层基坑变形性状的影响
Effect of retaining wall leakage on the deformation behavior of foundation pit in water-rich sandy strata
摘要
Abstract
Aiming at the disaster problem caused by leakage of water and sand in deep excavation,it is of great significance to reveal the evolution of foundation pit leakage disaster and its control method for underground engineering construction safety.Based on the leakage disaster of row-pile retaining deep foundation pit induced by deep excavation in water-rich sandy strata,the development characteristics and causes of leakage of water and sand during construction were analyzed,and the deformation behavior of foundation pit and its control measures under partial leakage were investigated by field monitoring and numerical simulation method.The results show that the development of leakage disaster of foundation pit is a complicated multi-field coupling process,and its occurrence is hidden and sudden.The horizontal displacement curve of retaining wall successively transformed from"oblique"shape,"bottom of pot"shape,shallow"inverted V"shape to deep"inverted V"shape with excavation depth.The maximum horizontal displacement of the retaining wall after leakage is 1.29 to 1.44 times larger than before leakage.The ground settlement curve of behind the retaining wall successively transformed from"flat ladle bottom"shape,"shallow ladle bottom"shape to"deep ladle bottom"shape with excavation depth;the sensitive zone of settlement trough is 1.00he to 1.20he(he is excavation depth).The ground settlement trough deepens and widens due to partial leakage,and the maximum ground settlement after leakage is 1.16 to 1.65 times that before leakage.The characteristics of the"jump"fluctuation of groundwater level can be used as the precursor signal to judge the leakage disaster of foundation pit.The change of supporting axial force is dynamically adjusted with the process of excavation and support to coordinate the development of deformation,and the supporting axial force fluctuates slightly during retaining wall leakage.The combined treatment measures of grouting and high pressure rotating spouting pile can effectively deal with the problem of leakage disaster control of foundation pit in water-rich sandy strata.This study can provide basic information for the theoretical analysis and control of leakage disaster of foundation pit.关键词
基坑工程/富水砂层/漏水漏砂/变形性状/现场实测/控制措施Key words
foundation pit/water-rich sandy strata/leakage groundwater and sand/deformation behavior/field monitoring/control measures分类
建筑与水利引用本文复制引用
邱明明,李晓敏,杨果林,段君义..挡墙渗漏对富水砂层基坑变形性状的影响[J].水文地质工程地质,2025,52(1):85-96,12.基金项目
国家自然科学基金项目(52208348) （52208348）
陕西省自然科学基础研究计划项目(2019JQ-834) （2019JQ-834）
陕西省教育厅科研计划项目(21JC035,19JK0963) （21JC035,19JK0963）
延安大学十四五中长期重大科研项目(2021ZCQ011) （2021ZCQ011）
