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Dilatancy and liquefaction behaviour of clean sand at wide range of confining stresses

低围压至高围压下砂土的剪胀性和液化性分析

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Abstract

The state of clean sand was mainly dependent on its void ratio (density) and confining stress that greatly influenced the mechanical behavior (compression, dilatancy and liquefaction) of clean sand. Confirming whether the confining stress was a state variable of sand required precise element tests at different confining stress, especially the tests under very low confining stress whose test data were very limited. In this study, static-dynamic characteristics of clean sand was comprehensively investigated by a unified test program under low and normal confining stress ranging from 5 to 98 kPa, under monotonic/cyclic and drained/undrained conditions, together with the literature available data under confining stress of 1.0 to 3.0 MPa. For monotonic loading tests, the contraction/dilation phase transition was observed for loose sand at low confining stress, and dilatancy angles were stress-dependent. In addition, the liquefaction resistance was observed to increase with reducing of confining stress, and the axial strain varied from compressive to dilative when confining stress increased. Special attention was also paid to the enhancement effect of membrane, and it was observed that its influence on the test results was limited. In addition, the experimental results were proved reliable by reproducibility.

摘要

砂土的状态主要取决于孔隙比(密实度)和围压大小,它们极大地影响了砂土的力学特性(压缩性、剪胀性和液化性)。为研究低围压至高围压范围内砂土相对密度和围压对土体强度和变形特性的影响,对2 种不同相对密实度砂土试样在低至高围压下(5~3 MPa)进行常规三轴固结排水剪切试验、常规三轴固结不排水试验和动三轴非排水试验,对砂土的静、动变形特性及静、动强度特性进行研究。试验结果表明:在单调加载条件下,在低围压范围(5~20 kPa),体积应变由剪缩向剪胀转变,且剪胀角具有明显的应力依存性,随着围压的减小而增大;在高围压范围(1~3 MPa),试样体积逐渐趋于剪缩;在循环加载条件下,砂土试样抵抗液化能力随着围压的减小而增强,轴向应变伴随着围压的增大从压缩状态向膨胀状态转变。同时,试验结果表明,应用文中的试验方法,橡皮膜的约束效应对低围压的试验结果影响较小。

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Authors and Affiliations

  1. Department of Civil Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Lin-lin Gu  (顾琳琳)

  2. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Zhen Wang  (王振)

  3. Department of Civil Engineering, Nagoya Institute of Technology, Nagoya, 4668555, Japan

    Asa-hiro Hosoya & Feng Zhang  (张锋)

Authors
  1. Lin-lin Gu  (顾琳琳)
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  2. Zhen Wang  (王振)
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  3. Asa-hiro Hosoya
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  4. Feng Zhang  (张锋)
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Corresponding author

Correspondence to Zhen Wang  (王振).

Additional information

Foundation item: Projects (51908288, 41627801) supported by the National Natural Science Foundation of China

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Gu, Ll., Wang, Z., Hosoya, Ah. et al. Dilatancy and liquefaction behaviour of clean sand at wide range of confining stresses. J. Cent. South Univ. 27, 2394–2407 (2020). https://doi.org/10.1007/s11771-020-4457-0

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  • DOI: https://doi.org/10.1007/s11771-020-4457-0

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