单轴压缩下预设裂隙对粘土特性的影响

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
W. Wang, Bin Zhao, Aiyu Hu, J. Shang
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引用次数: 0

摘要

在压缩作用下,土的缺陷不仅会削弱土的力学性能,而且会影响土的应变局部化。为了研究裂纹对土体压缩特性的影响,进行了不同倾角和不同位置裂纹的单轴压缩试验,并基于损伤塑性模型进行了二维数值分析。通过对原状和裂隙粘土的单轴压缩试验和模拟结果的分析,得出以下结论:(1)位于粘土右边缘上部的60度裂隙对粘土的破坏形态和损伤能影响最大,与原状相比,该裂隙可使粘土的抗压强度降低30%。(2)基于损伤塑性模型的数值方法可以基本模拟含裂隙土体的压缩行为,重现土体的破坏特征。(3)在严重破坏区域,预设裂缝对最大主应力演化有明显影响,而对剪应力演化影响较小。在轻度损伤区域,对最大主应力和剪应力的影响非常弱。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of a preset fissure on clay behavior under uniaxial compression
Under compression, the flaws in soils will not only weaken the mechanical properties of soils, but also affect the strain localization of soils. In order to study the influence of flaws on the behavior of soils under compression, the uniaxial compression tests of clays with different inclination and position fissures were carried out, and the two-dimensional numerical analysis was also discussed based on the damage plasticity model. Analyzing the results of the uniaxial compression test and simulation of the intact and fissured clays, the following conclusions can be drawn: (1) The 60-degree fissure located on the upper position of the right edge of the clay has the greatest influence on the failure form and damage energy of clays, which can reduce the compression strength by 30% compared with that of the intact clay. (2) The numerical method based on the damage plasticity model can basically simulate the compression behavior of clays containing a pre-existing fissure and reproduce the failure characteristics of clays. (3) The preset fissure has obvious influence on the evolution of maximum principal stress in the area with serious damage, but less on the shear stress. And in the area with slight damage, the effect on the maximum principal stress and shear stress is very weak.
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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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