基于固结不排水试验的上海软土结构性分析.pdfVIP

2025年2期江西建材岩土工程与勘察

基于固结不排水试验的上海软土结构性分析

邢春艳，杭荟曼

上海市政设计研究总院（集团）有限公司，上海200092

摘要：高压缩和流变的第③、第④层淤泥质软土是上海地区深基坑变形过大的主要地质原因。文中进行了上海地区第层淤泥质

黏土三轴固结不排水试验，分析了第④层淤泥质软土强度比S/α。和孔隙水压力系数A，随固结压力的变化规律。研究表明，第④层

淤泥质软土具有结构性，对一组土样而言，随着固结压力的加大，强度比S./α。下降、孔压系数A,升高；结构性逐步破坏；对于扰动严

重的土样，结构性被破坏,100kPa围压固结时，压缩性增加，强度比S./α。下降、孔压系数A,升高;100kPa围压固结时未发生应变软

化。研究成果对深化海相沉积的淤泥质软土的力学性质等有一定的指导意义。

关键词：软土；固结不排水试验；结构性

中图分类号：TU463文献标识码：A

StructuralAnalysisofShanghaiSoftSoilBasedonConsolidated

UndrainedTest

XingChunyan,HangHuiming

ShanghaiMunicipalEngineeringDesignInstitute(Group)Co.Ltd.,GeotechniqueCenter,Shanghai200092

Abstract:Thethirdandfourthlayersofmuddysoftsoilwithhighcompressionandrheologyarethemaingeologicalreasonsfortheexcessive

deformationofdeepfoundationpitofshanghaiarea.ToanalyzethevariationofthestrengthratioS./oandtheporewaterpressurecoefficient

A,ofthefourthlayerofmuddysoftsoilwiththeconsolidationpressure,thetriaxialconsolidatedundrainedtestofthefourthlayerofmuddysoft

soiliscarriedout.Theresultsshowthatthefourthlayerofmuddysoftsoilhasstructuralproperties.Foragroupofsoilsamples,withthein-

creaseofconsolidationpressure,thestrengthratiodecreasesandtheporepressurecoefficientA,increases;Thestructuraldamagegradually;

forseriouslydisturbedsoilsamples,thestructureiscompletelydestroyed.Consolidationwascarriedoutunder100kPaconfiningpressure,the

compressibilityincreases,thestrengthratiodecreasesandtheporepressurecoefficientA,increases;Afterconsolidationunderconfiningpres-

sureof100kPa,strainsofteningofthemuddysoftsoilwillnot