非饱和黄土结构性定量试验研究
|
摘要
非饱和黄土是典型的结构性土,对4种含水率的原状非饱和黄土和重塑非饱和黄土进行了3种围压下的三轴剪切试验。基于二元介质理论,通过原状非饱和黄土和重塑非饱和黄土的应力-应变曲线对比,定义了结构性参数结构应力分担比。考察了不同围压和含水率对结构应力分担比随应变变化的影响,并给出了其定量表达式。试验结果表明,围压和含水率是影响结构性的两个主要因素;随着应变增长,结构应力分担比分先线性增长后指数形式减低,其最大值可以表示成围压和含水率的函数。最后给出了考虑结构性的原状非饱和黄土本构模型的建模思路。
Unsaturated loess is a typical structural soil.The triaxial shearing tests for four kinds water content intact unsaturated loess and remolded unsaturated loess under three kinds of consolidtation pressures were carried out.Based on the tests and the concept of geo-binary medium model,the stress share ratio as a quantitative parameter has been proposed to study the structure of unsaturated loess.The effect of consolidation pressure and water content are analyzed and the stress share ratio is described by a mathematic formula.Results show that the structure of loess is mainly affected by consolidation pressure and water content.The stress share ratio increases linearly then decreases exponentially with the increment of strain.Further the stress share ratio was applied to the constitutive model of intact unsaturated loess.
Unsaturated loess is a typical structural soil.The triaxial shearing tests for four kinds water content intact unsaturated loess and remolded unsaturated loess under three kinds of consolidtation pressures were carried out.Based on the tests and the concept of geo-binary medium model,the stress share ratio as a quantitative parameter has been proposed to study the structure of unsaturated loess.The effect of consolidation pressure and water content are analyzed and the stress share ratio is described by a mathematic formula.Results show that the structure of loess is mainly affected by consolidation pressure and water content.The stress share ratio increases linearly then decreases exponentially with the increment of strain.Further the stress share ratio was applied to the constitutive model of intact unsaturated loess.
引文
[1]骆亚生,张爱军.黄土结构性的研究成果及其新进展[J].水力发电学报,2004,23(6):66-69.LUO Ya-sheng,ZHANG Ai-jun.Outcomes on structural research of loess and its new advance[J].Journal of Hydroelectric Engineering,2004,23(6):66-69.
[2]沈珠江.土体结构性的数学模型——21世纪土力学的核心问题[J]岩土工程学报.1996,18(1):95-97.SHEN Zhu-jiang.Soil structural mathematical model——21st century,The core issue of soil mechanics[J].Chinese Jounal of Geotechnical Engineering,1996,18(1):95-97.
[3]南京水利科学研究院.GB/T50123—1999土工试验规程[S].北京:中国计划出版社,1999.
[4]苗天德,王正贵.考虑微结构失稳的湿陷性和黄土变形机理[J].中国科学(B),1990,(1):86-96.MIAO Tian-de,WANG Zheng-gui.Deformation mechanism of collapsible loess in consideration of the microstructure instability[J].Science in China,Ser.B.1990,(1):86-96.
[5]谢定义,齐吉琳.土结构性及其定量化参数研究的新途径[J].岩土工程学报.1999,21(6):651-656.XIE Ding-yi,QI Ji-lin.Soil structure characteristics and new approach in research on its quantitative parameter[J].Chinese Jounal of Geotechnical Engineering,1999,21(6):651-656.
[6]谢定义,齐吉琳,朱元林.土的结构性参数及其与变形强度的关系[J].水利学报,1999,30(10):1-5.XIE Ding-yi,QI Ji-lin,ZHU Yuan-lin.Soil structure parameter and its relations to deformation and strength[J].Journal of Hydaulic Engineering,1999,30(10):1-5.
[7]谢定义.考虑土结构性的本构关系[J].土木工程学报.2000,33(4):35-40.XIE Ding-yi.A Constitutive laws considering soil structural properties[J].China Civil Engineering Journal,2000,33(4):35-40.
[8]陈存礼,胡再强,高鹏.原状黄土结构性及其变形特性关系研究[J].岩土力学,2004,26(4):522-525.CHEN Cun-li,HU Zai-qiang,GAO Peng.Research on relationship between structure and deformation property of intact loess[J].Rock and Soil Mechanics,2004,26(4):522-525
[9]陈存礼,何军芳,杨鹏.考虑结构性影响的原状黄土本构关系[J].岩土力学,2007,28(11):2284-2287.CHEN Cun-li,HE Jun-fang,YANG Peng.Constitutive relationship of intact loess considering structural effect[J].Rock and Soil Mechanics,2007,28(11):2284-2287.
[10]沈珠江.岩土破损力学与双重介质模型[J].水利水运工程学报,2002,(4):1-6.SHEN Zhu-jiang.Breakage mechanics and double-medium model for geological materials[J].Hydro-Science and Engineering,2002,(4):1-6.
[11]沈珠江.岩土破损力学:理想脆弹塑性模型[J].岩土工程学报,2003,25(3):253-257.SHEN Zhu-jiang.Breakage mechanics for geological materials:an ideal brittle-elasto-plastic model[J].Chinese Jounal of Geotechnical Engineering,2003,25(3):253-257.
[12]刘恩龙,沈珠江.结构性土强度准则探讨[J].工程力学,2007,24(2):1-8.LIU En-long,SHEN Zhu-jiang.Investagation on strength criterion for the structured soils[J].Engineering Mechanics,2007,24(2):1-8.
[13]胡伟.饱和黄土动力本构模型及其在桩-土-结构体系地震动力相互作用中的应用[博士论文D].西安:西安建筑科技大学,2008.
[14]凌华,殷宗泽,蔡正银.非饱和土的应力-含水率-应变关系试验研究[J].岩土力学,2008,29(3):651-655.LING Hua,YIN Zong-ze,CAI Zheng-yin.Experimental study on stress-water content-strain relationship of unsaturated soil[J].Rock and Soil Mechanics,2008,29(3):651-655.
[2]沈珠江.土体结构性的数学模型——21世纪土力学的核心问题[J]岩土工程学报.1996,18(1):95-97.SHEN Zhu-jiang.Soil structural mathematical model——21st century,The core issue of soil mechanics[J].Chinese Jounal of Geotechnical Engineering,1996,18(1):95-97.
[3]南京水利科学研究院.GB/T50123—1999土工试验规程[S].北京:中国计划出版社,1999.
[4]苗天德,王正贵.考虑微结构失稳的湿陷性和黄土变形机理[J].中国科学(B),1990,(1):86-96.MIAO Tian-de,WANG Zheng-gui.Deformation mechanism of collapsible loess in consideration of the microstructure instability[J].Science in China,Ser.B.1990,(1):86-96.
[5]谢定义,齐吉琳.土结构性及其定量化参数研究的新途径[J].岩土工程学报.1999,21(6):651-656.XIE Ding-yi,QI Ji-lin.Soil structure characteristics and new approach in research on its quantitative parameter[J].Chinese Jounal of Geotechnical Engineering,1999,21(6):651-656.
[6]谢定义,齐吉琳,朱元林.土的结构性参数及其与变形强度的关系[J].水利学报,1999,30(10):1-5.XIE Ding-yi,QI Ji-lin,ZHU Yuan-lin.Soil structure parameter and its relations to deformation and strength[J].Journal of Hydaulic Engineering,1999,30(10):1-5.
[7]谢定义.考虑土结构性的本构关系[J].土木工程学报.2000,33(4):35-40.XIE Ding-yi.A Constitutive laws considering soil structural properties[J].China Civil Engineering Journal,2000,33(4):35-40.
[8]陈存礼,胡再强,高鹏.原状黄土结构性及其变形特性关系研究[J].岩土力学,2004,26(4):522-525.CHEN Cun-li,HU Zai-qiang,GAO Peng.Research on relationship between structure and deformation property of intact loess[J].Rock and Soil Mechanics,2004,26(4):522-525
[9]陈存礼,何军芳,杨鹏.考虑结构性影响的原状黄土本构关系[J].岩土力学,2007,28(11):2284-2287.CHEN Cun-li,HE Jun-fang,YANG Peng.Constitutive relationship of intact loess considering structural effect[J].Rock and Soil Mechanics,2007,28(11):2284-2287.
[10]沈珠江.岩土破损力学与双重介质模型[J].水利水运工程学报,2002,(4):1-6.SHEN Zhu-jiang.Breakage mechanics and double-medium model for geological materials[J].Hydro-Science and Engineering,2002,(4):1-6.
[11]沈珠江.岩土破损力学:理想脆弹塑性模型[J].岩土工程学报,2003,25(3):253-257.SHEN Zhu-jiang.Breakage mechanics for geological materials:an ideal brittle-elasto-plastic model[J].Chinese Jounal of Geotechnical Engineering,2003,25(3):253-257.
[12]刘恩龙,沈珠江.结构性土强度准则探讨[J].工程力学,2007,24(2):1-8.LIU En-long,SHEN Zhu-jiang.Investagation on strength criterion for the structured soils[J].Engineering Mechanics,2007,24(2):1-8.
[13]胡伟.饱和黄土动力本构模型及其在桩-土-结构体系地震动力相互作用中的应用[博士论文D].西安:西安建筑科技大学,2008.
[14]凌华,殷宗泽,蔡正银.非饱和土的应力-含水率-应变关系试验研究[J].岩土力学,2008,29(3):651-655.LING Hua,YIN Zong-ze,CAI Zheng-yin.Experimental study on stress-water content-strain relationship of unsaturated soil[J].Rock and Soil Mechanics,2008,29(3):651-655.
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