部分排水条件下软黏土的循环三轴变形特性
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摘要
为研究软黏土路基在长期交通荷载下的变形特性,针对温州地区的路基软黏土开展了一系列部分排水循环动三轴加载试验,研究部分排水条件下正常固结软黏土的孔压及变形随循环加载次数的发展规律,重点分析循环动应力比对软黏土回弹模量以及轴向累积塑性应变的影响。以5%的轴向累积塑性应变作为温州软黏土在部分排水条件下的破坏标准,确定了其临界循环动应力比为0. 275。通过进一步考虑循环动应力比的影响,采用对数型经验模型对轴向累积塑性应变进行预测并建立了拟合参数与循环动应力比之间的关系。
A series of partially drained cyclic triaxial tests were performed on typical Wenzhou soft clay to investigate the deformation characteristics of soft clay in subgrade under long-term traffic load. The development laws of pore pressure and deformation of the soft clay with the increase of the frequencies of loading cycle were analyzed,and special attention was paid on the dynamic modulus and accumulated plastic strain of soft clay under different cyclic stress ratios. Based on the suggested value of 5% axial cumulative plastic strain as the failure criterion of Wenzhou saturated soft clay under partially drained conditions,and the critical cyclic stress ratio was 0. 275. Considering the effect of the cyclic stress ratios,a logarithmic empirical model was proposed to predict the accumulated plastic strain and the relationship between fitting parameters and cyclic stress ratios was established.
A series of partially drained cyclic triaxial tests were performed on typical Wenzhou soft clay to investigate the deformation characteristics of soft clay in subgrade under long-term traffic load. The development laws of pore pressure and deformation of the soft clay with the increase of the frequencies of loading cycle were analyzed,and special attention was paid on the dynamic modulus and accumulated plastic strain of soft clay under different cyclic stress ratios. Based on the suggested value of 5% axial cumulative plastic strain as the failure criterion of Wenzhou saturated soft clay under partially drained conditions,and the critical cyclic stress ratio was 0. 275. Considering the effect of the cyclic stress ratios,a logarithmic empirical model was proposed to predict the accumulated plastic strain and the relationship between fitting parameters and cyclic stress ratios was established.
引文
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[21]莫海鸿,单毅,李慧子,等.基于能量法的尾粉土累积应变增长方式研究[J].岩土工程学报,2017(11):17-24.
[22] Brown S F. Soil Mechanics in Pavement Engineering[J].Geotechnique,1996,46(3):383-426.
[23]熊焕,郭林,蔡袁强.交通荷载应力路径下砂土地基变形特性研究[J].岩土工程学报,2016,38(4):662-669.
[24]黄博,丁浩,陈云敏.高速列车荷载作用的动三轴试验模拟[J].岩土工程学报,2011,33(2):195-202.
[25] WICHTMANN T,NIEMUNIS A,TRIANTAFYLLIDIS T. Strain Accumulation in Sand Due to Cyclic Loading:Drained Triaxial Tests[J]. Soil Dynamics&Earthquake Engineering,2005,25(12):967-979.
[2]王建华,要明伦.软黏土不排水循环特性的弹塑性模拟[J].岩土工程学报,1996,18(3):11-18.
[3]钱建固,黄茂松.复杂应力状态下岩土体的非共轴塑性流动理论[J].岩石力学与工程学报,2006,25(6):1259-1259.
[4] LI T,MEISSNER H. Two-Surface Plasticity Model for Cyclic Undrained Behavior of Clays[J]. Journal of Geotechnical&Geoenvironmental Engineering,2002,128(7):613-626.
[5] HU C, LIU H, HUANG W. Anisotropic Bounding-Surface Plasticity Model for the Cyclic Shakedown and Degradation of Saturated Clay[J]. Computers and Geotechnics,2012(44):34-47.
[6] HU C,LIU H. A New Bounding-Surface Plasticity Model for Cyclic Behaviors of Saturated Clay[J]. Communications in Nonlinear Science and Numerical Simulation,2015,22(1/2/3):101-119.
[7] MONISMITH C L, OGAWA N, FREEME C R. Permanent Deformation Characteristics of Subgrade Soils due to Repeated Loading[J]. Transportation Research Board,1975(1):1-17.
[8] LI D Q,SELIG E T. Accumulative Plastic Deformation for FineGrained Subgrade Soils[J]. Journal of Geotechnical Engineering,ASCE,1996 122(12):1006-1013.
[9] CHAI J C, MIURA N. Traffic-Load-Induced Permanent Deformation of Road on Soft Subsoil[J]. Journal of Geotechnical and Geoenvironmental Engineering,2002,128(11):907-916.
[10]黄茂松,李进军,李兴照.软黏土的不排水循环累积变形特性[J].岩土工程学报,2006,28(7):891-895.
[11]张勇,孔令伟,郭爱国,等.循环荷载下软黏土的累积塑性应变试验研究[J].岩土力学,2009,30(6):1542-1548.
[12]臧濛,孔令伟,曹勇.描述循环荷载作用下黏土累积变形的改进模型[J].岩土力学,2017,38(2):435-442.
[13] REN X W,XU Q,TENG J,et al. A Novel Model for the Cumulative Plastic Strain of Soft Marine Clay Under Long-Term Low Cyclic Loads[J]. Ocean Engineering,2018(149):194-204.
[14] SAKAI A,SAMANG L,MIURA N. Partially-Drained Cyclic Behavior and Its Application to the Settlement of a Low Embankment Road on Silty-Clay[J]. Soils and Foundations,2003,43(1):33-46.
[15]丁智,张涛,魏新江,等.排水条件对不同固结度软黏土动力特性影响试验研究[J].岩土工程学报,2015,37(5):893-899.
[16]郭林,蔡袁强,王军.长期循环荷载作用下排水条件对软黏土动力特性影响[J].岩土力学,2013,34(增刊2):94-99.
[17]吴建奇,杨骁,徐旭,等.部分排水条件下饱和红黏土循环试验研究[J].浙江大学学报(工学版),2017,51(7):1309-1316.
[18] MAMOU A,POWRIE W,PRIEST J A,et al. The Effects of Drainage on the Behaviour of Railway Track Foundation Materials During Cyclic Loading[J]. Géotechnique,2017,67(10):1-10.
[19] CAO Y L,LAW K T. Energy Dissipation and Dynamic Behaviour of Clay Under Cyclic Loading[J]. Canadian Geotechnical Journal,1992,29(1):103-111.
[20] VOZNESENSKY E A,NORDAL S. Dynamic Instability of Clays:An Energy Approach[J]. Soil Dynamics&Earthquake Engineering,1999,18(2):125-133.
[21]莫海鸿,单毅,李慧子,等.基于能量法的尾粉土累积应变增长方式研究[J].岩土工程学报,2017(11):17-24.
[22] Brown S F. Soil Mechanics in Pavement Engineering[J].Geotechnique,1996,46(3):383-426.
[23]熊焕,郭林,蔡袁强.交通荷载应力路径下砂土地基变形特性研究[J].岩土工程学报,2016,38(4):662-669.
[24]黄博,丁浩,陈云敏.高速列车荷载作用的动三轴试验模拟[J].岩土工程学报,2011,33(2):195-202.
[25] WICHTMANN T,NIEMUNIS A,TRIANTAFYLLIDIS T. Strain Accumulation in Sand Due to Cyclic Loading:Drained Triaxial Tests[J]. Soil Dynamics&Earthquake Engineering,2005,25(12):967-979.