Investigation of 1D sand compression response using enhanced compressibility model

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.25.4.341
S. Chong
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Abstract

1D sand compression response to ko-loading experiences volume contraction from low to high effective stress regimes. Previous study suggested compressibility model with physically correct asymptotic void ratios at low and high stress levels and examined only for both remolded clays and natural clays. This study extends the validity of Enhanced Terzaghi model for different sand types complied from 1D compression data. The model involved with four parameters can adequately fit 1D sand compression data for a wide stress range. The low stress obtained from fitting parameters helps to identify the initial fabric conditions. In addition, strong correlation between compressibility and the void ratio at low stress facilitates determination of self-consistent fitting parameters. The computed tangent constrained modulus can capture monotonic stiffening effect induced by an increase in effective stress. The magnitude of tangent stiffness during large strain test should not be associated with small strain stiffness values. The use of a single continuous function to capture 1D stress-strain sand response to ko-loading can improve numerical efficiency and systematically quantify the yield stress instead of ad hoc methods.
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基于增强压缩率模型的一维砂土压缩响应研究
1D砂土压缩对ko载荷的响应经历了从低到高有效应力状态的体积收缩。先前的研究提出了在低应力和高应力水平下具有物理正确的渐近空隙比的压缩率模型,并且只对重塑粘土和天然粘土进行了研究。本研究从一维压缩数据中扩展了增强Terzaghi模型对不同砂型的有效性。该模型包含4个参数,可以很好地拟合较宽应力范围下的一维砂土压缩数据。拟合参数得到的低应力有助于确定织物的初始状态。此外,在低应力下,压缩率与孔隙率之间的强相关性有助于自洽拟合参数的确定。计算的切线约束模量可以捕捉到有效应力增加引起的单调加筋效应。大应变试验中切线刚度的大小不应与小应变刚度值相关联。使用单一的连续函数来捕获ko加载下的1D应力-应变砂响应,可以提高数值效率,并系统地量化屈服应力,而不是采用特殊的方法。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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