动载下饱和重塑黄土的骨干曲线变化研究
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摘要
针对饱和重塑黄土进行了一系列等向固结和偏压固结下的排水与不排水动三轴试验,分析了饱和重塑黄土的动力性质、骨干曲线模型及其影响因素。基于动三轴试验结果,探讨了在考虑累积塑性应变影响下,修正Hardin-Drnevich模型的适用性。结果表明,考虑累积塑性应变时,修正Hardin-Drnevich模型能够较好地模拟饱和重塑黄土的骨干曲线试验结果。进而分析了等向固结和偏压固结、固结围压、波形和排水条件等因素对饱和重塑黄土骨干曲线的影响,得到偏压固结和固结围压的增大使骨干曲线上移,土体强度增加,而波形对骨干曲线的影响较小;排水条件下的骨干曲线较不排水条件下的有所上移,土体强度增加。所得结论可供工程设计人员参考。
A series of triaxial tests of saturated remolded loess under dynamic loading in isotropic and anisotropic consolidation stress states on condition of drain and undrain are performed to analyse its dynamic characteristics and backbone curves.Based on the dynamic triaxial test results,the effect of accumulated plastic strain is considered;and then the applicability of modified model of Hardin-Drnevich to saturated remolded loess is discussed.The results show that the modified model of Hardin-Drnevich could simulate the backbone curve of saturated remolded loess well.After that,the influences of isotropic and anisotropic consolidation stress states,confining pressure of consolidation,wave form and drain or undrain on the backbone curve for saturated remolded loess are also discussed.The backbone curves are all upper shift under anisotropic consolidation with the increasing confining pressure of consolidation;and it is shown that the strength of samples is increased;the impact of wave form on backbone curve is little;the effect of drain condition on it is upper shift comparing with undrained condition and this indicates that the strength of samples is enhanced.The conclusions can be for referenced by engineering designers.
A series of triaxial tests of saturated remolded loess under dynamic loading in isotropic and anisotropic consolidation stress states on condition of drain and undrain are performed to analyse its dynamic characteristics and backbone curves.Based on the dynamic triaxial test results,the effect of accumulated plastic strain is considered;and then the applicability of modified model of Hardin-Drnevich to saturated remolded loess is discussed.The results show that the modified model of Hardin-Drnevich could simulate the backbone curve of saturated remolded loess well.After that,the influences of isotropic and anisotropic consolidation stress states,confining pressure of consolidation,wave form and drain or undrain on the backbone curve for saturated remolded loess are also discussed.The backbone curves are all upper shift under anisotropic consolidation with the increasing confining pressure of consolidation;and it is shown that the strength of samples is increased;the impact of wave form on backbone curve is little;the effect of drain condition on it is upper shift comparing with undrained condition and this indicates that the strength of samples is enhanced.The conclusions can be for referenced by engineering designers.
引文
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[7]HARDIN BO,DRNEVICH VP.Shear modulus and damping in soils:measurement and parameter effects[J].Journal of the Soil Mechanics and Foundation Engineering Division,ASCE,1972,98(6):603-624.
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[9]HARDIN BO,KALINSKI ME.Estimating the shear modulus of gravelly soils[J].Journal of Getechnical and Geoenvironmental Engineering,2005,131(7):867-875.
[10]尚守平,刘方成,杜运兴,等.应变累积对黏土动剪模量和阻尼比影响的试验研究[J].岩土力学,2006,27(5):683-688.SHANG Shou-ping,LIU Fang-cheng,DU Yun-xing,et al.Experimental study on effect of shear strain accumulation on dynamic shear modulus and damping ratio of clay soil[J].Rock and Soil Mechanics,2006,27(5):683-688.
[2]陈学良,金星,陶夏新,等.土体动力一维非线性本构关系剖析与评价[J].地震工程与工程振动,2006,26(6):147-157.CHENG Xue-liang,JIN Xing,TAO Xia-xin,et al.A soildynamic double-parabola constitutive model considering effect of soil test damping[J].Earthquake Engineering and Engineering Vibration,2006,26(6):147-157.
[3]巫志辉,谢定义,余雄飞.洛川黄土的动变形和强度特性[J].水利学报,1994,38(12):67-71.WU Zhi-hui,XIE Ding-yi,YU Xiong-fei.Study on dynamic deformation and strength characteristics of Luochuan loess[J].Journal of Hydraulic Engineering,1994,38(12):67-71
[4]骆亚生.非饱和黄土在动、静复杂应力条件下的结构变化特性及结构性本构关系研究[D].西安:西安理工大学,2003.
[5]骆亚生,胡仲有,张爱军.非饱和黄土结构性参数与其强度指标关系初探[J].岩土力学,2009,30(4):943-948.LUO Ya-sheng,HU Zhong-you,ZHANG Ai-jun.Regularity of relation between structural parameter and strength indexes of unsaturated loess[J].Rock and Soil Mechanics,2009,30(4):943-948.
[6]王兰民,张振中,王峻,等.随机地震荷载作用下黄土动强度的试验方法[J].西北地震学报,1991,13(3):50-55.WANG Lan-min,ZHANG Zhen-zhong,WANG Jun,et al.A test method of dynamic strength of loess under random seismic loading[J].Northwestern Seismological Journal,1991,13(3):50-55.
[7]HARDIN BO,DRNEVICH VP.Shear modulus and damping in soils:measurement and parameter effects[J].Journal of the Soil Mechanics and Foundation Engineering Division,ASCE,1972,98(6):603-624.
[8]HARDIN BO,DRNEVICH VP.Shear modulus and damping in soils:design equations and curves[J].Journal of the Soil Mechanics and Foundation Engineering Division,ASCE,1972,98(7):667-692.
[9]HARDIN BO,KALINSKI ME.Estimating the shear modulus of gravelly soils[J].Journal of Getechnical and Geoenvironmental Engineering,2005,131(7):867-875.
[10]尚守平,刘方成,杜运兴,等.应变累积对黏土动剪模量和阻尼比影响的试验研究[J].岩土力学,2006,27(5):683-688.SHANG Shou-ping,LIU Fang-cheng,DU Yun-xing,et al.Experimental study on effect of shear strain accumulation on dynamic shear modulus and damping ratio of clay soil[J].Rock and Soil Mechanics,2006,27(5):683-688.
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