双向耦合剪切条件下饱和砂土动强度特性试验研究
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摘要
针对饱和粉细砂,利用双向耦合多功能剪切仪进行了均等固结条件下的循环耦合剪切试验。应用已有的动强度定义,着重研究了双向动荷载的相位差β,双向动荷载的幅值比值λ对砂土动强度及孔压特性的影响。实验结果表明,砂土液化动强度与相位差β及幅值之比λ密切相关,现有的动强度定义在复杂加载情况下具有一定局限性;双向动荷载相位差β以及幅值比值λ对孔隙水压力增长速度影响显著,但对归一化孔隙水压力发展模式没有显著的影响。
Using the vertical-torsional coupling shear apparatus,a set of bi-directional cyclic loading tests on saturated sand under isotropic consolidated condition are conducted.Based on the existing definitions of dynamic strength,the effects of phase difference of bi-directional dynamic load(λ) and ratio of bi-directional dynamic load amplitude(β) on dynamic strength and pore pressure of sand are studied.The test results show that the dynamic strength of liquefaction of saturated sand considerably relates with bothβ and λ.The existing definitions of dynamic strength have obvious limitation.The phase difference of bi-directional dynamic load(β) and the ratio of bi-directional dynamic load amplitude(λ) have significant influences on the growth rate of pore water pressure,while they have no significant influence on the development model for the normalized pore water pressure.
Using the vertical-torsional coupling shear apparatus,a set of bi-directional cyclic loading tests on saturated sand under isotropic consolidated condition are conducted.Based on the existing definitions of dynamic strength,the effects of phase difference of bi-directional dynamic load(λ) and ratio of bi-directional dynamic load amplitude(β) on dynamic strength and pore pressure of sand are studied.The test results show that the dynamic strength of liquefaction of saturated sand considerably relates with bothβ and λ.The existing definitions of dynamic strength have obvious limitation.The phase difference of bi-directional dynamic load(β) and the ratio of bi-directional dynamic load amplitude(λ) have significant influences on the growth rate of pore water pressure,while they have no significant influence on the development model for the normalized pore water pressure.
引文
[1]ISHIHARA K,YAMAZAKI F.Cyclic simple shear tests on saturated sand in multi-directional loading[J].Soils and Foundations,1980,20(1):45–59.
[2]ISHIHARA K,A YAMAZAKI.Analysis of wave-induced liquefaction in seabed deposits of sand[J].Soils and Foundations,1984,24(3):85–100.
[3]TOWHATA K,ISHIHARA K.Undrained strength of sand undergoing cyclic rotation of principal stress axes[J].Soil and Foundations,1985,25(2):135–147.
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[5]郭莹,栾茂田,许成顺,等.主应力方向变化对松砂不排水动强度特性的影响[J].岩土工程学报,2003,25(6):666–670.(GUO Ying,LUAN Mao-tian,XU Cheng-shun,et al.Effect of variation of principal stress orientation on undrained dynamic strength behavior of loose sand[J].Chinese Journal of Geotechnical Engineering,2003,25(6):666–670.(in Chinese))
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[9]许成顺,栾茂田,何杨,等.主应力方向对饱和松砂不排水单调剪切特性影响的试验研究[J].岩土工程学报,2006,28(9):1085–1089.(XU Cheng-shun,LUAN Mao-tian,HE Yang,et al.Experimental study on effect of orientation of the principal stress on undrained behavior of saturated loose sand under monotonic shearing[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1085–1089.(in Chinese))
[10]许成顺,文利明,杜修力,等.不同应力路径条件下的砂土剪切特性试验研究[J].水利学报,2010(1):108–112.(XU Cheng-shun,WENG Li-ming,DU Xiu-li,et al.Experimental study on shear behaviors of sand under different stress path[J].Journal of Hydraulic Engineering,2010(1):108–112.(in Chinese))
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[12]沈瑞福,王洪瑾,周景星.动主应力轴连续旋转下砂土的动强度[J].水利学报,1996(1):27–33.(SHEN Rui-fu,WANG Hong-jin,ZHOU Jing-xing.Dynamic strength of sand under the rotation of principal stress axes[J].Journal of Hydraulic Engineering,1996(1):27–33.(in Chinese))
[13]许成顺,刘晨,刘海强,等.竖向-扭转双向耦合剪切仪功能分析及应用[J].北京工业大学学报,2013(2):233–238.(XU Cheng-shun,LIU Chen,LIU Hai-qiang,et al.The function analysis and application of vertical-torisional coupling shear apparatus[J].Journal of Beijing University of Technology,2013(2):233–238.(in Chinese))
[14]聂影,栾茂田,杨庆,等.不同应力路径下饱和黏土耦合循环剪切特性[J].岩土力学,2009,30(7):1927–1932.(NIE Ying,LUAN Mao-tian,YANG Qing,et al.Study of coupling cyclic test of saturated clay under different stress paths[J].Rock and Soil Mechanics,2009,30(7):1927–1932.(in Chinese))
[15]SATO K,YASAHARA K.YOSHIDA N.Effect of drainage with pre-shearing on undrained cyclic shear behavior of dense sand[C]//Proceeding of the 8th International Conference on the Behavior of Off-Shore Structure,1997:85–97.
[2]ISHIHARA K,A YAMAZAKI.Analysis of wave-induced liquefaction in seabed deposits of sand[J].Soils and Foundations,1984,24(3):85–100.
[3]TOWHATA K,ISHIHARA K.Undrained strength of sand undergoing cyclic rotation of principal stress axes[J].Soil and Foundations,1985,25(2):135–147.
[4]王平安,于澍.主应力轴旋转下饱和砂土振动孔隙水压力发展和变化的研究[J].西安建筑科技大学学报,1996,28(4):81–85.(WANG Ping-an,YU Shu.On the pore water pressure in saturation sand subjected to rotation of principal stress axes[J].Journal of Xi'an University of Architecture and Technology,1996,28(4):81–85.(in Chinese))
[5]郭莹,栾茂田,许成顺,等.主应力方向变化对松砂不排水动强度特性的影响[J].岩土工程学报,2003,25(6):666–670.(GUO Ying,LUAN Mao-tian,XU Cheng-shun,et al.Effect of variation of principal stress orientation on undrained dynamic strength behavior of loose sand[J].Chinese Journal of Geotechnical Engineering,2003,25(6):666–670.(in Chinese))
[6]郭莹.复杂应力条件下饱和松砂的不排水动力特性试验研究[D].大连:大连理工大学,2003.(GUO Ying.Experimental studies on undrained cyclic behavior of loose sands under complex stress conditions considering static and cyclic coupling effect[D].Dalian:Dalian University of Technology,2003.(in Chinese))
[7]栾茂田,金丹,许成顺,等.双向耦合剪切条件下饱和松砂的液化特性试验研究[J].岩土工程学报,2008,30(6):790–794.(LUAN Mao-tian,JIN Dan,XU Cheng-shun,et al.Liquefaction of sand under bi-directional cyclic loading[J].Chinese Journal of Geotechnical Engineering,2008,30(6):790–794.(in Chinese))
[8]栾茂田,许成顺,何杨,等.复杂应力条件下饱和松砂单调与循环剪切特性的比较研究[J].地震工程与工程振动,2006(1):181–187.(LUAN Mao-tian,XU Cheng-shun,HE Yang,et al.A comparative study on monotonic and cyclic shear behavior of saturated loose sand under complex stress condition[J].Earthquake Engineering and Engineering Vibration,2006(1):181–187.(in Chinese))
[9]许成顺,栾茂田,何杨,等.主应力方向对饱和松砂不排水单调剪切特性影响的试验研究[J].岩土工程学报,2006,28(9):1085–1089.(XU Cheng-shun,LUAN Mao-tian,HE Yang,et al.Experimental study on effect of orientation of the principal stress on undrained behavior of saturated loose sand under monotonic shearing[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1085–1089.(in Chinese))
[10]许成顺,文利明,杜修力,等.不同应力路径条件下的砂土剪切特性试验研究[J].水利学报,2010(1):108–112.(XU Cheng-shun,WENG Li-ming,DU Xiu-li,et al.Experimental study on shear behaviors of sand under different stress path[J].Journal of Hydraulic Engineering,2010(1):108–112.(in Chinese))
[11]冷艺,栾茂田,许成顺,等.复杂应力条件下饱和砂土单调剪切特性的试验研究[J].岩土力学,2007,28(增刊1):21–28.(LENG Yi,LUAN Mao-tian,XU Cheng-shun,et al.Experimental research on behaviors of saturated sand subject to drained shear strength under complex stress conditions[J].Rock and Soil Mechanics,2007,28(S1):21–28.(in Chinese))
[12]沈瑞福,王洪瑾,周景星.动主应力轴连续旋转下砂土的动强度[J].水利学报,1996(1):27–33.(SHEN Rui-fu,WANG Hong-jin,ZHOU Jing-xing.Dynamic strength of sand under the rotation of principal stress axes[J].Journal of Hydraulic Engineering,1996(1):27–33.(in Chinese))
[13]许成顺,刘晨,刘海强,等.竖向-扭转双向耦合剪切仪功能分析及应用[J].北京工业大学学报,2013(2):233–238.(XU Cheng-shun,LIU Chen,LIU Hai-qiang,et al.The function analysis and application of vertical-torisional coupling shear apparatus[J].Journal of Beijing University of Technology,2013(2):233–238.(in Chinese))
[14]聂影,栾茂田,杨庆,等.不同应力路径下饱和黏土耦合循环剪切特性[J].岩土力学,2009,30(7):1927–1932.(NIE Ying,LUAN Mao-tian,YANG Qing,et al.Study of coupling cyclic test of saturated clay under different stress paths[J].Rock and Soil Mechanics,2009,30(7):1927–1932.(in Chinese))
[15]SATO K,YASAHARA K.YOSHIDA N.Effect of drainage with pre-shearing on undrained cyclic shear behavior of dense sand[C]//Proceeding of the 8th International Conference on the Behavior of Off-Shore Structure,1997:85–97.
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