循环扭剪作用下黄土的动剪切特性试验研究

doi:10.11779/CJGE202001019

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摘要原状黄土具有显著的结构性,在增湿及循环剪切作用下均可导致其结构破坏。通过不同固结围压条件下大尺寸原状黄土圆筒试样的动扭剪试验,测试分析了原状黄土从小应变到大应变的动应力应变关系,动剪切模量和阻尼比的变化规律,以及逐级增大循环扭剪作用下黄土的剪切强度。得到了10^-5~10^-2剪切应变范围内黄土动剪切模量随固结围压和含水率的变化规律,分析了黄土最大动剪切模量随黄土构度的变化规律。建立了黄土最大动剪切模量与构度和固结围压的关系式。揭示不同固结围压条件下不同含水率黄土的阻尼比随动剪应变对数值的变化分布在一个带内;循环扭转作用下圆筒黄土样存在两组破坏面。

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	邵帅
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关键词 ：原状黄土, 动扭剪试验, 动应力应变关系, 动剪切模量, 阻尼比, 剪切破坏面

Abstract：The unsaturated intact loess has remarkable structured properties. Its structure is damaged by wetting and cyclic shear action, which leads to the development of shear and subsidence deformation of loess under earthquake. Based on the dynamic torsional shear tests on hollow cylindrical specimens of intact loess under different consolidation pressures, the dynamic shear-strain relationship from small to large strain, the dynamic shear modulus and the dynamic damping ratio of loess are tested and analyzed. The relationships between dynamic shear stress and shear strain, dynamic shear modulus and dynamic damping ratio and the failure strength of loess under gradually increasing cyclic torsion shear action are measured. The variation rules of dynamic shear modulus of loess under different consolidation pressures and moisture contents are obtained in the shear strain range of 10^-5~10^-2. It is shown that the maximum dynamic shear modulus increases with the initial structural index of loess. An approximate linear relationship among the maximum dynamic shear modulus, the structural index and the consolidation pressure is established. The damping ratio of loess changing with the dynamic shear strain logarithm under different consolidation pressure and moisture contents is released. The shear failure characteristics of cylindrical loess samples under cyclic torsional shear action are constituted by two groups of shear failure planes.

Key words： undisturbed loess dynamic torsional shear test dynamic stress-strain relationship dynamic shear modulus damping ratio shear failure plane

收稿日期: 2018-10-06

ZTFLH:

TU43

基金资助:国家自然科学基金面上项目（11572245）

通讯作者: *（E-mail：sjshao@xaut.edu.cn）

作者简介: 邵帅(1991— ),男,博士研究生,主要从事黄土力学与土动力学研究。E-mail: 315602024 @qq.com。

引用本文:

邵帅, 邵生俊, 陈攀, 袁浩. 循环扭剪作用下黄土的动剪切特性试验研究[J]. 岩土工程学报, 2020, 42(1): 168-174. SHAO Shuai, SHAO Sheng-jun, CHEN Pan, YUAN Hao. Experimental study on dynamic shear characteristics of loess under cyclic torsional shearing. Chinese J. Geot. Eng., 2020, 42(1): 168-174.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE202001019 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2020/V42/I1/168

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