饱和粉土静态液化性能试验研究
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摘要
通过固结不排水三轴压缩试验,分析了围压、固结比和干密度等因素对饱和粉土静态液化特性的影响。试验结果表明,在干密度较小时,饱和粉土的偏应力-应变曲线呈现明显的硬变软化型,随轴向应变增大超静孔隙水压力增加、有效应力减小而发生静态液化,当干密度达到1.58 g·cm-3时,饱和粉土的偏应力-应变曲线表现出硬变硬化现象,超静孔隙水压力为负值或接近0,饱和粉土不再发生静态液化,即饱和粉土存在静态液化的干密度临界值;其他条件不变,随着围压、固结比或干密度的增大,偏应力峰值和残余强度均增大,静态液化势降低;根据有效应力路径建立了流滑面以作为饱和粉土稳定区与非稳定区的分界面。
Through consolidated undrained triaxial compression test, the influence of confining pressure,consolidation ratio and dry density on the static liquefaction characteristics of saturated silt soil are analyzed. The test results show that when the dry density is lower,the deviatoric stress-strain curves of saturated silt soil exhibit obvious strain softening characteristics. With the increase of axial strain,the excess pore water pressure increases and the effective stress decreases,which results in static liquefaction. When the dry density reaches to 1. 58 g·cm-3,the deviatoric stress-strain curves of saturated silt soil exhibit strain hardening characteristics,and the excess pore water pressure is negative or close to zero. So there is a critical value of dry density of static liquefaction. As other conditions are constant,with the increase of confining pressure,consolidation ratio or dry density,the peak value of deviatoric stress and the residual strength increase and the static liquefaction potential decreases. According to the effective stress path,the flow liquefaction is established as the interface of the stable zone and the unstable zone of saturated silt soil.
Through consolidated undrained triaxial compression test, the influence of confining pressure,consolidation ratio and dry density on the static liquefaction characteristics of saturated silt soil are analyzed. The test results show that when the dry density is lower,the deviatoric stress-strain curves of saturated silt soil exhibit obvious strain softening characteristics. With the increase of axial strain,the excess pore water pressure increases and the effective stress decreases,which results in static liquefaction. When the dry density reaches to 1. 58 g·cm-3,the deviatoric stress-strain curves of saturated silt soil exhibit strain hardening characteristics,and the excess pore water pressure is negative or close to zero. So there is a critical value of dry density of static liquefaction. As other conditions are constant,with the increase of confining pressure,consolidation ratio or dry density,the peak value of deviatoric stress and the residual strength increase and the static liquefaction potential decreases. According to the effective stress path,the flow liquefaction is established as the interface of the stable zone and the unstable zone of saturated silt soil.
引文
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Yamamuro J A,Lade P V.1997.Static liquefaction of very loose sands[J].Canadian Geotechnical Journal,34(6):905-917.
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黄茂松,曲勰,吕玺琳.2014.基于状态相关本构模型的松砂静态液化失稳数值分析[J].岩石力学与工程学报,33(7):1479-1486.
贾建博.2010.降雨条件下松散粉砂边坡静态液化机理的研究[D].哈尔滨:哈尔滨工业大学.
金艳丽,戴福初.2008.饱和黄土的静态液化特性试验研究[J].岩土力学,29(12):3293-3298.
李声立.2010.颗粒级配对砂土静态液化行为的影响研究[D].哈尔滨:哈尔滨工业大学.
吕玺琳,赖海波,黄茂松.2014.饱和土体静态液化失稳理论预测[J].岩土力学,35(5):1329-1333,1339.
朱建群,孔令伟,钟方杰.2008.南京砂强度特征与静态液化现象分析[J].岩土力学,29(6):1461-1470.
Fang Z,Chen Y M,He S K,et al.2017.Coupling analysis of water-air two-phase flow in static liquefaction of desaturated losse sand[J].Rock and Soil Mechanics,38(11):3379-3384.
Hazout L,El-Abidine Z Z,Belkhatir M,et al.2017.Evaluation of static liquefaction characteristics of saturated loose sand through the mean grain size and extreme grain sizes[J].Geotechnical and Geological Engineering,35:2079-2105.
Huang M S,Qu X,Lu L.2014.Instability and static liquefaction analysis of loose sands with a state-dependent constitutive model[J].Chinese Journal of Rock Mechanics and Engineering,33(7):1479-1486.
Jia J B.2010.Study on the mechanics of static liquefaction in slopes with loose silty sand under rainy condition[D].Harbin:Harbin Institute of Technology.
Jin Y L,Dai F C.2008.Experimental investigation of static liquefaction of saturated loess[J].Rock and Soil Mechanics,29(12):3293-3298.
Lade P V.1992.Static instability and liquefaction of loose fine sandyslopes[J].Journal of Geotechnical Engineering,ASCE,118(1):51-71.
Li L S.2010.Effects of Particle gradation on static liquefaction behaviour of sands[D].Harbin:Harbin Institute of Technology.
LüX L,Lai H B,Huang M S.2014.Theoretically predicting instability of static liquefaction of saturated soils[J].Rock and Soil Mechanics,35(5):1329-1333,1339.
Monkula M M,Etminanb E,爦enolc A.2017.Coupled influence of content,gradation and shape characteristics of silts on static liquefaction of loose silty sands[J].Soil Dynamics and Earthquake Engineering,101:12-26.
Olson S M,Stark T D.2003.Use of laboratory data to confirm yield and liquefied strength ratio ncepts[J].Canadian Geotechnical Journal,40(6):1164-1184.
Rahman M M,Lo S R.2012.Predicting the onset of static liquefaction of loose sand with fines[J].Journal of Geotechnical and Geoenvironmental Engineering,138(8):1037-1041.
Sadrekarimi A.2016.Static liquefaction analysis considering principal stress directions and anisotropy[J].Geotechnical and Geological Engineering,34(4):1135-1154.
Yamamuro J A,Lade P V.1997.Static liquefaction of very loose sands[J].Canadian Geotechnical Journal,34(6):905-917.
Zhu J Q,Kong L W,Zhong F J.2008.Analysis of strength characteristics of Nanjing sand and mechanism of static liquefaction[J].Rock and Soil Mechanics,29(6):1461-1470.
方志,陈育民,何森凯,等.2017.减饱和松砂静态液化的水-气两相流耦合分析[J].岩土力学,38(11):3379-3384.
黄茂松,曲勰,吕玺琳.2014.基于状态相关本构模型的松砂静态液化失稳数值分析[J].岩石力学与工程学报,33(7):1479-1486.
贾建博.2010.降雨条件下松散粉砂边坡静态液化机理的研究[D].哈尔滨:哈尔滨工业大学.
金艳丽,戴福初.2008.饱和黄土的静态液化特性试验研究[J].岩土力学,29(12):3293-3298.
李声立.2010.颗粒级配对砂土静态液化行为的影响研究[D].哈尔滨:哈尔滨工业大学.
吕玺琳,赖海波,黄茂松.2014.饱和土体静态液化失稳理论预测[J].岩土力学,35(5):1329-1333,1339.
朱建群,孔令伟,钟方杰.2008.南京砂强度特征与静态液化现象分析[J].岩土力学,29(6):1461-1470.