不同应力路径下饱和软粘土静力特性试验研究
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摘要
采用英国GDS变围压动三轴系统对温州饱和软粘土分别进行了应力路径斜率η=1/3时不同初始有效固结围压的静力试验和不同应力路径的静力试验,研究了不同条件下温州饱和软粘土的强度特性。试验结果表明,不同初始有效固结围压和不同应力路径的温州饱和软粘土均呈应变硬化规律,且呈非线性;随着初始有效固结围压的增加,土体的强度在增加;应力路径斜率η=1/3时不同初始有效固结围压下,土体所呈现的变化曲线具有相似性。
The Stress path tests on saturated Wenzhou soft clays were conducted on the GDS dynamic triaxial testing system with variable confining pressures.Tests are performed with the slope of the stress path is set to be 1/3with different initial effective confining stress and with various stress paths.The test results indicate that,the nonlinear strain hardening phenomena can be observed in different initial effective confining pressures and different stress paths.With the increase of initial effective consolidation pressure,the strength of the soft clay increases.Under a stress path slope of 1/3,all soil hardening curves are similar.
The Stress path tests on saturated Wenzhou soft clays were conducted on the GDS dynamic triaxial testing system with variable confining pressures.Tests are performed with the slope of the stress path is set to be 1/3with different initial effective confining stress and with various stress paths.The test results indicate that,the nonlinear strain hardening phenomena can be observed in different initial effective confining pressures and different stress paths.With the increase of initial effective consolidation pressure,the strength of the soft clay increases.Under a stress path slope of 1/3,all soil hardening curves are similar.
引文
[1]刘琦.不同应力路径吹填软土结构性力学特性研究[D].天津:天津城市建设学院,2012.
[2]T.W.Lambe.Method of Estimating settlement[J].JSMFD,ASCE,vo1.90,SM5,1964.
[3]LAMBE T W.Stress Path Methed[J].Journal of Soil Mechannics and Foundation Division,ASCE,1967,93(6):268-277.
[4]Feda J.Stress-Path Dependent Shear Strength of Sand[J].American Society of Civil Engineers,ASCE,1994,120(6):958-974.
[5]Tang-Tat Ng.Ultimate State of Samples of Ellipsoids under Different Stress Paths[J].J.Eng.Mech.2008.134:723-729.
[6]Mofiz S A,Islam M N.Modeling and Numerical Analysis of Expansive Soil in Stress Path Tests[J].Proceedings of the GeoFlorida 2010 Conference,ASCE,2010,Section:Soil and Geotechnical System Characterization,747-756.
[7]刘祖德,陆士强,杨天林,等.应力路径对填土应力应变关系的影响及其应用[J].岩土工程学报,1982(4):45-55.
[8]谷川.基于变围压应力路径的饱和软粘土动力特性试验研究[D].浙江:浙江大学,2012.
[9]谷川,王军,张婷婷,等.应力路径对饱和软黏土割线模量的影响[J].岩土力学,2013,12:3394-3402.
[10]李广信.高等土力学[M].北京:清华大学才出版社,2004.
[2]T.W.Lambe.Method of Estimating settlement[J].JSMFD,ASCE,vo1.90,SM5,1964.
[3]LAMBE T W.Stress Path Methed[J].Journal of Soil Mechannics and Foundation Division,ASCE,1967,93(6):268-277.
[4]Feda J.Stress-Path Dependent Shear Strength of Sand[J].American Society of Civil Engineers,ASCE,1994,120(6):958-974.
[5]Tang-Tat Ng.Ultimate State of Samples of Ellipsoids under Different Stress Paths[J].J.Eng.Mech.2008.134:723-729.
[6]Mofiz S A,Islam M N.Modeling and Numerical Analysis of Expansive Soil in Stress Path Tests[J].Proceedings of the GeoFlorida 2010 Conference,ASCE,2010,Section:Soil and Geotechnical System Characterization,747-756.
[7]刘祖德,陆士强,杨天林,等.应力路径对填土应力应变关系的影响及其应用[J].岩土工程学报,1982(4):45-55.
[8]谷川.基于变围压应力路径的饱和软粘土动力特性试验研究[D].浙江:浙江大学,2012.
[9]谷川,王军,张婷婷,等.应力路径对饱和软黏土割线模量的影响[J].岩土力学,2013,12:3394-3402.
[10]李广信.高等土力学[M].北京:清华大学才出版社,2004.