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Large-scale triaxial experiments on the static and dynamic behavior of an artificially cemented gravel material
European Journal of Environmental and Civil Engineering ( IF 2.1 ) Pub Date : 2020-07-16 , DOI: 10.1080/19648189.2020.1792350
Zhongzhi Fu 1 , Shengshui Chen 2 , Huaqiang Han 1
Affiliation  

Abstract

This article presents the results of a set of 28 large-scale triaxial tests, including 12 consolidated-drained (CD) static tests and 16 consolidated-undrained (CU) dynamic tests, on an artificially cemented gravel. The strength, dilatancy, stiffness and damping behaviour of both the cemented and the uncemented specimens are compared. Cementation is found to have interrelated effects on increasing the peak strength, enhancing the dilative behaviour, increasing the static and dynamic stiffness, and reducing the damping ratio. Cementing the particles leads to a delayed but more evident dilative behaviour subsequent to an initial contraction, which is interpreted as the result of the existence of locked voids and the limited void-filling capacity of the cemented clusters. A cemented specimen generally yields before achieving its peak deviator strength, after which an increasing dilative behaviour is accompanied by strain softening. Cementation also increases the maximum shear modulus and reduces its dependence on the mean effective stress. Due to the bonds created near the contacts and their effect on restricting inter-particle sliding, the damping ratio of a cemented specimen is generally lower than that of an uncemented specimen, and the difference in the damping ratio becomes increasingly evident under an increasing shear strain amplitude.



中文翻译:

人工胶结砾石材料静动态特性的大型三轴试验

摘要

本文介绍了在人工胶结砾石上进行的一组 28 次大型三轴试验的结果,其中包括 12 次固结排水 (CD) 静态试验和 16 次固结不排水 (CU) 动态试验。比较了胶结和非胶结试件的强度、剪胀性、刚度和阻尼性能。发现胶结对增加峰值强度、增强膨胀性能、增加静态和动态刚度以及降低阻尼比具有相互关联的影响。胶结颗粒导致在初始收缩后延迟但更明显的膨胀行为,这被解释为存在锁定空隙和胶结簇的空隙填充能力有限的结果。胶结试样通常在达到其峰值偏斜强度之前屈服,之后,增加的膨胀行为伴随着应变软化。胶结还增加了最大剪切模量并降低了其对平均有效应力的依赖性。由于在接触点附近产生的键及其对限制颗粒间滑动的影响,胶结试样的阻尼比通常低于未胶结试样的阻尼比,并且随着剪切应变的增加,阻尼比的差异变得越来越明显振幅。

更新日期:2020-07-16
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