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Influence of moisture content on shearing strength of unsaturated undisturbed quaternary system middle pleistocene

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Abstract

The unsaturated undisturbed quaternary system middle pleistocene loess, a typical unsaturated soil, often occurs in the implementation of western development strategy. To obtain the shearing strength characteristics of this unsaturated undisturbed loess, based on the analysis of mineral composition, the triaxial shear test of undisturbed quaternary system middle pleistocene loess under different moisture contents is conducted with the specialized triaxial instrument for unsaturated soil. The test results show that the mainly mineral composition of undisturbed quaternary system middle pleistocene loess is quartz and albite. Under the same confining pressure, the matric suction increases with the decrease of moisture content. The smaller the moisture content, the larger the matric suction; the higher the moisture content, the lower the matric suction. Under the same moisture content, the matric suction increases with the confining pressure and reaches a maximum when the confining pressure is 100 kPa, and then decreases with the increase of confining pressure. This phenomenon is closely related to the grain contact tightness of soil mass under high confining pressure. According to the triaxial test of loess, the sample of loess experiences 4 stages from loading to failure: 1) compaction stage; 2) compression stage; 3) microcrack developing stage; 4) shear failure stage. The test sample is of brittle failure (weak softening) under low moisture content and confining pressure. With the decrease of matric suction and the increase of consolidated confining pressure, the stress-strain curve changes from softening type to ideal plastic type. In the shearing strength parameters of unsaturated undisturbed loess, the influence of moisture content on internal friction angle is small, but that on cohesive force is obvious. Therefore, the shearing strength of unsaturated undisturbed loess is higher than that of saturated undisturbed loess and varies with the moisture content.

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Authors and Affiliations

  1. School of Civil Engineering, Chongqing University, Chongqing, 400045, China

    Zu-liang Zhong  (钟祖良), Xin-rong Liu  (刘新荣), Xiao-yong Li  (李小勇) & Sui Wang  (王睢)

  2. Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education (Chongqing University), Chongqing, 400045, China

    Zu-liang Zhong  (钟祖良) & Xin-rong Liu  (刘新荣)

  3. Department of Civil Engineering, Logistical Engineering University, Chongqing, 401311, China

    Zu-liang Zhong  (钟祖良) & Yuan-xue Liu  (刘元雪)

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  1. Zu-liang Zhong  (钟祖良)
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  2. Yuan-xue Liu  (刘元雪)
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  3. Xin-rong Liu  (刘新荣)
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  4. Xiao-yong Li  (李小勇)
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  5. Sui Wang  (王睢)
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Correspondence to Zu-liang Zhong  (钟祖良).

Additional information

Foundation item: Project(51108485) supported by the National Natural Science Foundation of China; Project(20110191120033) supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China; Projects(106112013CDJZR200001, CDJZR12200012) supported by the Fundamental Research Funds for the Central Universities, China; Project(cstc2013jcyjA30005) supported by the Natural Science Foundation of Chongqing, China

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Zhong, Zl., Liu, Yx., Liu, Xr. et al. Influence of moisture content on shearing strength of unsaturated undisturbed quaternary system middle pleistocene. J. Cent. South Univ. 22, 2776–2782 (2015). https://doi.org/10.1007/s11771-015-2808-z

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  • DOI: https://doi.org/10.1007/s11771-015-2808-z

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