模拟非饱和完全分解花岗岩在不同条件下的水力力学行为

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Xianyu Xiong, Y. Xiong, Feng Zhang
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引用次数: 3

摘要

由于非饱和土的水力力学行为比饱和土更为复杂,因此建立非饱和土模型的一个重要问题是如何将非饱和土的应力-应变关系与其保水特性进行适当的耦合。通过一系列试验结果表明,不同加载/水力条件下,非饱和完全分解花岗岩(CDG,又称Masado)的应力-应变关系、吸力和饱和度变化存在较大差异。为了精确地模拟非饱和Masado的水力力学行为,在本研究中,首先将超载荷概念引入现有的饱和/非饱和本构模型中,以考虑结构的影响。在此基础上,提出了考虑土体体积变化的保水曲线模型,该模型假设保水特征骨架曲线和扫描曲线随孔隙率变化平行移动。将提出的WRC模型纳入本构模型,并利用非饱和Masado的保水、测水和三轴试验结果验证了新提出模型的有效性。该模型在描述应力-应变关系以及非饱和Masado的吸力和饱和度变化方面的准确性令人满意。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modelling the hydraulic/mechanical behaviour of an unsaturated completely decomposed granite under various conditions
Because the hydraulic/mechanical behaviour of unsaturated soil is more complicated than that of saturated soil, one of the most important issues in modelling unsaturated soil is to properly couple its stress-strain relationship with its water retention characteristics. Based on the results of a series of tests, the stress-strain relationship and the changes in suction and saturation of unsaturated completely decomposed granite (CDG, also called Masado) vary substantially under different loading/hydraulic conditions. To precisely model the hydraulic/mechanical behaviour of unsaturated Masado, in this study, the superloading concept was firstly introduced into an existing saturated/unsaturated constitutive model to consider the structural influences. Then a water retention curve (WRC) model considering the volumetric change in the soil, in which the skeleton and scanning curves of the water retention characteristics were assumed to shift in parallel in accordance with the change in the void ratio, was proposed. The proposed WRC model was incorporated into the constitutive model, and the validity of the newly proposed model was verified using the results of tests conducted on unsaturated Masado, including water retention, oedometer and triaxial tests. The accuracy of the proposed model in describing the stress-strain relationship and the variations in suction and saturation of unsaturated Masado is satisfactory.
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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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