主应力轴循环旋转对超固结黏土性状影响试验研究
|
摘要
对不同超固结比以及超固结形成条件下原状软黏土在主应力轴循环旋转条件下的孔压、应力应变关系等性状进行试验研究。研究结果表明,随着超固结比的提高,试样在主应力轴循环旋转过程中的动强度及等效瞬时刚度均有显著提高,而其孔压开展特征则受前期超固结形成过程中反压控制条件影响:若超固结卸载时不提供反压恒定控制条件,试样在后续主应力轴循环旋转过程中的孔压迅速呈现负压的变化趋势,负孔压的持续开展程度随超固结比的增大而提高;而当超固结卸载时恒定控制反压,土体在后续的主应力轴旋转过程中,仅在强超固结比条件下孔压才会产生负向开展特征。但不同的反压控制条件未对土体在主应力轴循环旋转中的振次–应变关系以及动强度等特性产生显著影响。
Experimental study on the overconsolidated clay under the cyclic principal stress rotation(CPSR) was performed.Emphasis was put on the influence of different overconsolidation conditions on the characteristics of samples during CPSR.It was found that with the increase of the over consolidation ratio,the equivalent dynamic stiffness and dynamic strength of samples during CPSR increased obviously,while these characteristics were independent of the back pressure control condition during overconsolidation.But whether or not the back pressure was kept constant greatly influenced the generation and level of development of negative pore pressure during the following CPSR stage.
Experimental study on the overconsolidated clay under the cyclic principal stress rotation(CPSR) was performed.Emphasis was put on the influence of different overconsolidation conditions on the characteristics of samples during CPSR.It was found that with the increase of the over consolidation ratio,the equivalent dynamic stiffness and dynamic strength of samples during CPSR increased obviously,while these characteristics were independent of the back pressure control condition during overconsolidation.But whether or not the back pressure was kept constant greatly influenced the generation and level of development of negative pore pressure during the following CPSR stage.
引文
[1]ISHIHARA K,TOWHATA I.Sand response to cyclic rotation of principal stress directions as induced by wave loads[J].Soils and Foundations,1983,23(4):11–26.
[2]TOWHATA I,ISHIHARA K.Undrained strength of sand undergoing cyclic rotation of principal stress axes[J].Soils and Foundations,1985,25(2):135–147.
[3]刘元雪,郑颖人.含主应力轴旋转的土体本构关系研究进展[J].力学进展,2000,30(4):597–604.(LIU Yuan-xue,ZHENG Ying-ren.Research development of soils constitutive relation involving principal stress axes rotation[J].Advances in Mechanics,2000,30(4):597–604.(in Chinese))
[4]付磊,王洪瑾,周景星.主应力偏转角对砂砾料动力特性影响的试验研究[J].岩土工程学报,2000,22(4):435–440.(FU Lei,WANG Hong-jin,ZHOU Jing-xing.Effect of the initial rotation angle of principal stress on the dynamic properties of soil[J].Chinese Journal of Geotechnical Engineering,2000,22(4):435–440.(in Chinese))
[5]郭莹,栾茂田,何杨,等.复杂应力条件下饱和松砂孔隙水压力增长特性的试验研究[J].地震工程与工程振动,2004,24(3):139–144.(GUO Ying,LUAN Mao-tian,HE Yang,et al.Experimental study on development pattern of shaking-induced pore water pressure of saturated loose sand under complex loading[J].Earthquake Engineering and Engineering Vibration,2004,24(3):139–144.(in Chinese))
[6]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 cyclic rotation of principal stress directions[J].Tournal of Hydraulic Engineering,1996(1):27–33.(in Chinese))
[7]ARTHUR J R F,CHUA K S,DUNSTAN T,et al.Principal stress rotation:a missing parameter[J].Journal of the Geotechnial Engineering Division,Proceedings of the American Society of Civil Engineers,1980,106(4):419–433.
[8]WONG R K S,ARTHUR J R F.Sand sheared by stresses with cyclic variations in direction[J].Geotechnique,1986,36(2):215–226.
[9]GR?BE P J.Resilient and permanent deformation of railway foundations under principal stress rotation[D].Southampton:University of Southampton,2002.
[10]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))
[11]张晨明,董秀竹,郭莹,等.波浪荷载作用下砂土变形特性的模拟试验研究[J].地震工程与工程振动,2005,25(2):155–159.(ZHANG Chen-ming,DONG Xiu-zhu,GUO Ying,et al.Experimental study on dynamic deformation behavior of sand under wave induced loading[J].Earthquake Engineering and Engineering Vibration,2005,25(2):155–159.(in Chinese))
[12]沈扬,周建,张金良,等.主应力轴循环旋转下原状软黏土临界性状试验研究[J].浙江大学学报(工学版),2008,42(1):77–82.(SHEN Yang,ZHOU Jian,ZHANG Jin-liang,et al.Experimental study of critical properties of natural soft clay under cyclic principal stress rotation[J].Journal of Zhejiang University(Engineering Science),2008,42(1):77–82.(in Chinese))
[13]沈珠江,孙大伟.超固结土变形和稳定的折减吸力算法[J].岩土工程学报,2005,27(1):104–109.(SHEN Zhu-jiang,SUN Da-wei.Deformation and stability analysis of over-consolidated soils based on reduced suction concept[J].Chinese Journal of Geotechnical Engineering,2005,27(1):104–109.(in Chinese))
[2]TOWHATA I,ISHIHARA K.Undrained strength of sand undergoing cyclic rotation of principal stress axes[J].Soils and Foundations,1985,25(2):135–147.
[3]刘元雪,郑颖人.含主应力轴旋转的土体本构关系研究进展[J].力学进展,2000,30(4):597–604.(LIU Yuan-xue,ZHENG Ying-ren.Research development of soils constitutive relation involving principal stress axes rotation[J].Advances in Mechanics,2000,30(4):597–604.(in Chinese))
[4]付磊,王洪瑾,周景星.主应力偏转角对砂砾料动力特性影响的试验研究[J].岩土工程学报,2000,22(4):435–440.(FU Lei,WANG Hong-jin,ZHOU Jing-xing.Effect of the initial rotation angle of principal stress on the dynamic properties of soil[J].Chinese Journal of Geotechnical Engineering,2000,22(4):435–440.(in Chinese))
[5]郭莹,栾茂田,何杨,等.复杂应力条件下饱和松砂孔隙水压力增长特性的试验研究[J].地震工程与工程振动,2004,24(3):139–144.(GUO Ying,LUAN Mao-tian,HE Yang,et al.Experimental study on development pattern of shaking-induced pore water pressure of saturated loose sand under complex loading[J].Earthquake Engineering and Engineering Vibration,2004,24(3):139–144.(in Chinese))
[6]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 cyclic rotation of principal stress directions[J].Tournal of Hydraulic Engineering,1996(1):27–33.(in Chinese))
[7]ARTHUR J R F,CHUA K S,DUNSTAN T,et al.Principal stress rotation:a missing parameter[J].Journal of the Geotechnial Engineering Division,Proceedings of the American Society of Civil Engineers,1980,106(4):419–433.
[8]WONG R K S,ARTHUR J R F.Sand sheared by stresses with cyclic variations in direction[J].Geotechnique,1986,36(2):215–226.
[9]GR?BE P J.Resilient and permanent deformation of railway foundations under principal stress rotation[D].Southampton:University of Southampton,2002.
[10]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))
[11]张晨明,董秀竹,郭莹,等.波浪荷载作用下砂土变形特性的模拟试验研究[J].地震工程与工程振动,2005,25(2):155–159.(ZHANG Chen-ming,DONG Xiu-zhu,GUO Ying,et al.Experimental study on dynamic deformation behavior of sand under wave induced loading[J].Earthquake Engineering and Engineering Vibration,2005,25(2):155–159.(in Chinese))
[12]沈扬,周建,张金良,等.主应力轴循环旋转下原状软黏土临界性状试验研究[J].浙江大学学报(工学版),2008,42(1):77–82.(SHEN Yang,ZHOU Jian,ZHANG Jin-liang,et al.Experimental study of critical properties of natural soft clay under cyclic principal stress rotation[J].Journal of Zhejiang University(Engineering Science),2008,42(1):77–82.(in Chinese))
[13]沈珠江,孙大伟.超固结土变形和稳定的折减吸力算法[J].岩土工程学报,2005,27(1):104–109.(SHEN Zhu-jiang,SUN Da-wei.Deformation and stability analysis of over-consolidated soils based on reduced suction concept[J].Chinese Journal of Geotechnical Engineering,2005,27(1):104–109.(in Chinese))
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心