上海国土资源2026，Vol.47Issue(1)：19-24,55,7.DOI:10.3969/j.issn.2095-1329.2026.01.003
主动控制预制压入式沉井侧壁和刃脚邻近土体应力路径演化与变形响应特征
Stress path evolution and deformation response of soils surrounding side wall and blade foot of active control press-in prefabricated shaft
摘要
Abstract
Under the construction of an active control press-in prefabricated shaft(ACPP),the evolution of stress paths and the mechanisms governing the deformation response of the surrounding soils remain insufficiently understood.To clarify the underlying behavior and support stability assessment and safety control during shaft sinking,this study is based on the ACPP emergency shaft of Beiqing Road Station on Shanghai Metro Line 13 and adopts an integrated approach combining numerical simulation and laboratory stress-path testing.The entire sinking process was simulated using ABAQUS,from which representative stress paths of soil elements at different depths adjacent to the sidewall and the cutting edge were extracted and then mapped as loading histories for stress-path triaxial tests to investigate soil mechanical responses under different stress paths.Results indicate that,under ACPP conditions,the stress paths of soils along the shaft side exhibit pronounced stratification:the shallow zone is dominated by stress release induced by excavation unloading;the middle zone develops a typical unloading-reloading cyclic path with the most significant stress redistribution;and the deep zone near the cutting edge shows stepwise reloading recovery of confining pressure after progressive unloading,while axial stress either accumulates continuously or undergoes minor adjustments.The tests further show that the middle soft clay experiences more pronounced radial rebound during unloading,suggesting a potentially sensitive interval for fluctuations in sinking rate and differential settlement.These findings provide a reference for mechanical analysis,construction pacing optimization,and safety control of ACPP shaft sinking.关键词
主动控制预制压入式沉井/侧壁和刃脚土体/数值模拟/应力路径试验Key words
active control press-in prefabricated shaft/soils surrounding side wall and blade foot/numerical simulation/stress-path test分类
管理科学引用本文复制引用
吉茂杰,朱令,王建秀,龙燕霞,吴炜枫,孙远威,张原瀚,潘伟强,李昊,郭彦..主动控制预制压入式沉井侧壁和刃脚邻近土体应力路径演化与变形响应特征[J].上海国土资源,2026,47(1):19-24,55,7.基金项目
上海市住房和城乡管理委员会重点课题(2024-Z02-007) （2024-Z02-007）
上海市交通委员会科研项目(JT2025-KY-027) （JT2025-KY-027）
上海申通地铁集团有限公司课题(JS-KY24R006) （JS-KY24R006）
上海长凯岩土工程有限公司课题(kh0023020231733) （kh0023020231733）
