华东地质2026，Vol.47Issue(3)：520-535,16.DOI:10.16788/j.hddz.32-1865/P.2024.09.007
崇明三岛地面沉降特征及浅部土层沉降原因分析
The characteristics of land subsidence and the cause analysis of shallow soil subsidence in Chongming three islands
摘要
Abstract
Shanghai has been undergoing over a century of land subsidence,which is increasingly complex in terms of its mechanisms and causes in recent years.This study uses long-term settlement data extracted from layered extensometers located in the three monitoring stations on Chongming three islands.This study character-izes deep and shallow soil layer settlement under minimal subsidence conditions.Results show that shallow soil layers settle continuously,while deep layers remain stable or even rebound.Shallow soil layers contribute over 89%to land subsidence,making them the primary contributor.Analysis of shallow soil properties and external drivers reveals the primary causes of shallow soil settlement in Chongming three islands:①Rainfall changes alter phreatic water levels,triggering elastic deformation in shallow sand layers.②Foundation pit construction activi-ties trigger consolidation settlement in clay layers.This creates plastic deformation within compressible soil strata.③Land reclamation projects cause seepage consolidation in soft soils,generating secondary consolidation that decreases over time.These findings reveal new subsidence features in Chongming three islands and clarify shallow layer mechanisms,providing critical reference for developing precise ground subsidence control strate-gies.关键词
崇明三岛/地面沉降/沉降特征/沉降机理/沉降主导层Key words
Chongming three islands/land subsidence/subsidence characteristics/subsidence mechanism/dominant layer of subsidence分类
天文与地球科学引用本文复制引用
代如凤,战庆,吴建中,黄鑫磊..崇明三岛地面沉降特征及浅部土层沉降原因分析[J].华东地质,2026,47(3):520-535,16.基金项目
上海市地质学会科研课题"长兴岛全部土层自然沉降特征和机理研究(编号:Dzxh202205)"、国家自然科学基金地质联合重点支持项目"长三角深层地下空间开发地质灾害孕育机制与风险预警(编号:U2444220)"和上海市优秀学术带头人项目"地下水位持续上升引发的地质环境效应及安全预警研究(编号:23XD1402400)"联合资助. （编号:Dzxh202205）
