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粒间应力、土骨架应力和有效应力

邵龙潭, 郭晓霞, 郑国锋

邵龙潭, 郭晓霞, 郑国锋. 粒间应力、土骨架应力和有效应力[J]. 岩土工程学报, 2015, 37(8): 1478-1483. DOI: 10.11779/CJGE201508017
引用本文: 邵龙潭, 郭晓霞, 郑国锋. 粒间应力、土骨架应力和有效应力[J]. 岩土工程学报, 2015, 37(8): 1478-1483. DOI: 10.11779/CJGE201508017
SHAO Long-tan, GUO Xiao-xia, ZHENG Guo-feng. Intergranular stress, soil skeleton stress and effective stress[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(8): 1478-1483. DOI: 10.11779/CJGE201508017
Citation: SHAO Long-tan, GUO Xiao-xia, ZHENG Guo-feng. Intergranular stress, soil skeleton stress and effective stress[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(8): 1478-1483. DOI: 10.11779/CJGE201508017

粒间应力、土骨架应力和有效应力  English Version

详细信息
    作者简介:

    邵龙潭(1963- ),男,教授,博士生导师,主要从事土和孔隙介质力学基本理论研究、土工结构稳定分析、土工试验测试技术与仪器研发等方面的教学和科研。E-mail: shaolt@dlut.edu.cn。

  • 中图分类号: TU43

Intergranular stress, soil skeleton stress and effective stress

  • 摘要: 有效应力的概念和有效应力原理对于土力学具有奠基性的意义。但对于诸如“有效应力是虚拟的应力还是真实应力”,“有效应力方程是否需要修正”等问题在土力学界一直存有争议,尚没有形成共识。在明确有效应力就是不包含孔隙流体压强作用的土骨架应力的基础上,由土颗粒间力的平衡分析和土骨架单元体的平衡分析得到有效应力与总应力以及孔隙流体压强关系的表达式。对于饱和土,这一表达式就是Terzaghi的有效应力方程。表明Terzaghi的有效应力是真实的物理量,具有明确的物理意义,Terzaghi的有效应力方程不需要做任何修正。文中阐明了有效应力、粒间应力和土骨架应力的物理意义及其相互关系。说明在分离考虑孔隙流体压强作用的情况下,有效应力、粒间应力和土骨架应力三者可以是一致的,即不包含孔隙水压强作用的粒间应力和土骨架应力就是有效应力。土骨架应力可以分成孔隙流体压强产生的土骨架应力和有效应力两部分,两者都对土体的变形和强度有贡献,但是作用效果不同。在孔隙流体压强作用对土体的变形和强度的贡献可以忽略的条件下,有效应力决定土的变形和强度。
    Abstract: The concept and principle of effective stress are significant to the development of soil mechanics. However, some problems such as “Is the effective stress the virtual or real stress?” and “Whether Terzaghi’s effective stress equation needs to be modified or not?” have long been considered to be controversial issues, and there is no consensus up to now. According to the definition that the effective stress is the skeleton stress due to all the external forces excluding pore water pressure, the relationship among the total stress, skeleton stress and pore water pressure can be obtained through the equilibrium analysis of intergranular force and free body of the soil skeleton. Then it may be seen that the expression of the relationship is the Terzaghi’s effective stress equation for saturated soils. It indicates that the Terzaghi’s effective stress is a real physical quantity and has a definite physical meaning. The Terzaghi’s effective stress equation is valid with no necessity to be modified. Moreover, the physical meaning and mutual relations of effective stress, intergranular stress and skeleton stress are clarified in this paper. It indicates that considering the effects of pore water pressure separately, the intergranular stress and the skeleton stress are the same as the effective stress. On the other hand, the skeleton stress can be divided into two components: one is that due to pore fluid pressure and the other is effective stress. They both contribute to the strength and deformation of a soil but play different roles. When the effect of the skeleton stress due to pore fluid pressure on the strength and deformation of a soil can be neglected, changes in the volume and shear strength of a soil are due exclusively to the ones in the effective stress.
  • [1] TERZAGHI K. The shearing resistance of saturated soils and the angle between the planes of shear[C]// Proceedings for the 1st International Conference on Soil Mechanics and Foundation Engineering (Cambridge, MA). Cambridge, 1936, 1, 54-56.
    [2] JENNINGS J E B. BURLAND J B. Limitations to the use of effective stresses in partly saturated soils[J]. Géotechnique, 1962, 12(2): 125-144.
    [3] BISHOP A W, BLIGHT G E. Some aspects of effective stress in saturated and partly saturated soils[J]. Géotechnique, 1963, 13(3): 177-197.
    [4] BIOT M A. General theory of three‐dimensional consolidation[J]. Journal of Applied Physics, 1941, 12(2): 155-164.
    [5] ZIENKIEWICZ O C, SHIOMI T. Dynamic behaviour of saturated porous media; the generalized Biot formulation and its numerical solution[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 1984, 8(1): 71-96.
    [6] LADE P V, BOER R DE. The concept of effective stress for soil concrete and rock[J]. Géotechnique, 1997, 47(1): 61-78.
    [7] SKEMPTON A W. Effective stress in soils, concrete and rocks, pore pressure and suction in soils[C]// Conf organized by the British National Society of Int Society of soil Mech and Foundation Eng. London, 1961: 4-25.
    [8] 沈珠江. 关于固结理论和有效应力的讨论[J]. 岩土工程学报, 1995, 17(6): 118-119. (SHEN Zhu-jiang. Discussion on consolidation theory and effective stress[J]. Chinese Journal of Geotechnical Engineering, 1995, 17(6): 118-119. (in Chinese))
    [9] 邵龙潭. 饱和土的土骨架应力方程[J]. 岩土工程学报, 2011, 33(12): 1833-1837. (SHAO Long-tan. Skeleton stress equation for saturated soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(12): 1833-1837. (in Chinese))
    [10] 邵龙潭. 孔隙介质力学分析方法及其在土力学中的应用[D]. 大连: 大连理工大学, 1996. (SHAO Long-tan. Fundamental theory of porous material mechanics and its application in soil mechanics[D]. Dalian: Dalian University of Technology, 1996. (in Chinese))
    [11] 赵成刚, 白 冰, 王运霞. 土力学原理[M]. 北京: 清华大学出版社, 北京交通大学出版社, 2004. (ZHAO Cheng-gang, BAI Bing, WANG Yun-xia. Fundamental of soil mechanics[M]. Beijing: Tsinghua University Press, Beijing Jiaotong University Press, 2004. (in Chinese))
    [12] 陈仲颐, 周景星, 王洪瑾. 土力学[M]. 北京: 清华大学出版社, 1994. (CHEN Zhong-yi, ZHOU Jing-xing, WANG Hong-jin. Soil mechnics[M]. Beijing: Tsinghua University Press, 1994. (in Chinese))
    [13] 李广信. 关于有效应力原理的几个问题[J]. 岩土工程学报, 2011, 33(2): 315-320. (LI Guang-xin. Some problems about principle of effective stress[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(2): 315-320. (in Chinese))
    [14] 陈正汉, 秦 冰. 非饱和土的应力状态变量研究[J]. 岩土力学, 2012, 33(1): 1-11. (CHEN Zheng-han, QIN Bing. On stress state variables of unsaturated soils[J]. Rock and Soil Mechanics, 2012, 33(1): 1-11. (in Chinese))
    [15] CARROLL M M. Mechanical response of fluid-saturated porous materials[C]// Proc 15th International Congress of Theoretical and Applied Mechanics. New York: North-Holland, 1980: 251-261.
    [16] 邵龙潭, 郭晓霞. 有效应力新解[M]. 北京: 水利水电出版社, 2014. (SHAO Long-tan, GUO Xiao-xia. New explanation of the effective stress[M]. Beijing: China Waterpower Press, 2014. (in Chinese))
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出版历程
  • 收稿日期:  2014-10-13
  • 发布日期:  2015-08-24

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