Study on tenso-shear coupling strength of clays

被引：0
|
作者：
Kong Xiao-ang [1 ]
Cai Guo-qing [1 ]
Zhao Cheng-gang [1 ,2 ]
机构：
[1] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China
[2] Guilin Univ Technol, Coll Civil Engn & Architecture, Guilin 541004, Guangxi, Peoples R China
来源：
ROCK AND SOIL MECHANICS | 2016年 / 37卷 / 08期
基金：
中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;
关键词：
saturated clay; combinations of tenso-shear; tenso-shear coupling strength model; strength formulas;
D O I：
10.16285/j.rsm.2016.08.021
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Traditional studies on soil strength are mainly concerned with the soils subjected to the compressive shear stress state, and only a few addressed the strength characteristics of soils subjected to uniaxial tension, triaxial tension or combinations of tenso-shear. Based on the analysis of the existing results, a tenso-shear coupling strength model is developed with considering various combinations of tenso-shear in saturated clay. The failure envelope and the peak strength line as well as the strength under multidirectional tension are analyzed, and the corresponding strength formulations with specific derivation process are obtained. Different types of saturated clay are selected for the uniaxial tensile test, direct shear test and triaxial shear test. It is shown that the proposed model performs very well. Due to the complete theoretical basis and simpler strength formulation, the proposed strength model can be conveniently applied in practice, yielding better results in understanding and analyzing the behavior of saturated soils subjected to combinations of tenso-shear, such as slope instability caused by rainfall infiltration or earthquake loading.
引用
收藏
页码：2285 / +
页数：9
相关论文
共 27 条
  • [1] Zhao C.-G., Bai B., Fundamentals of Soil Mechanics, (2009)
  • [2] Zhu C.-H., Liu J.-M., Yan B.-W., Et al., Experimental study on relationship between tensile and shear strength of unsaturated clay earth material, Chinese Journal of Rock Mechanics and Engineering, 27, pp. 3453-3458, (2008)
  • [3] Lu N., Likos, William J., Unsaturated Soil Mechanics, (2004)
  • [4] Yue Z.-Q., Xu Q., Fundamental drawbacks and disastrous consequences of current geotechnical safety design theories for slopes, Chinese Journal of Geotechnical Engineering, 9, pp. 1601-1606, (2014)
  • [5] Zhao C.-G., Li J., Liu Y., Et al., Discussion on some fundamental problems in unsaturated soil mechanics, Rock and Soil Mechanics, 34, 7, pp. 1825-1831, (2013)
  • [6] Haefeli R., Investigation and measurements of the shear strengths of saturated cohesive soils, Géotechnique, 2, 3, pp. 186-208, (1951)
  • [7] Vesga L.F., Direct tensile-shear test (DTS) on unsaturated kaolinite clay, ASTM Geotechnical Testing Journal, 32, 5, pp. 397-409, (2009)
  • [8] Shen Z.-J., Theoretical Soil Mechanics, (2000)
  • [9] Li R.J., Liu J., Yan R., Et al., Characteristics of structural loess strength and preliminary framework for joint strength formula, Water Science and Engineering, 7, 3, pp. 319-330, (2014)
  • [10] Song Y.-X., Li R.-J., Liu J.-D., Et al., A hyperbola strength formula of structural loess and its modifying algorithm under failure stress state, Rock and Soil Mechanics, 35, 6, pp. 1534-1540, (2014)
123