粉质粘土-结构界面剪切破坏机理的实验与数值模拟

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Boxin Wang , Zihao Wang , Wen Zhang , Jingjing Pan , Jiaqi Liu , Qing Wang
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引用次数: 0

摘要

土与基础结构之间的剪切现象是基础工程中常见的现象。地层含水率的变化不可避免地影响着土体和结构的剪切性能,特别是在水物性复杂的粘性土区域。本文以松嫩平原粉质粘土为例,从多尺度上揭示了不同含水量下粉质粘土-结构界面剪切破坏机理。首先,采用直剪试验和颗粒图像测速技术对其宏观力学特性进行了研究。为了进一步探索细观演化规律,本研究提出了一种新的FDM-DMDEM(有限差分法-确定细观参数离散元法)。该方法可以直接计算和分配基于非饱和土理论的数值模型所需的细观参数,完全避免了传统DEM固有的费力和主观的反校准过程。本文采用该耦合方法建立了三维数值模型,并进行了参数化分析。结果表明:粉质粘土在一定范围内的细观结构破坏,从界面开始产生塑性变形,形成剪切带;破坏有剪切带内剪切破坏和剪切带外剪切破坏两种形式。含水量的增加削弱了颗粒间的结合力,使剪切带外产生剪切应力变得困难,导致剪切带内出现典型的剪切破坏。研究结果可为松嫩平原地区基础工程的施工提供一定的设计参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental and numerical simulation for shear failure mechanism of silty clay–structure interface
The shear phenomenon between soil and foundation structure is common in foundation engineering. The change in the water content of stratum affects the shear behavior of soil and structure inevitably, especially in the region of cohesive soil with complex hydro-physical properties. In this paper, the silty clay in the Songnen Plain was used as a case study to reveal the shear failure mechanism of silty clay–structure interface under different water contents from multiple scales. First, the macroscopic mechanical characteristics were investigated by direct shear test and particle-image-velocimetry technology. To further explore the mesoscopic evolution law, this study proposed a novel FDM-DMDEM (Finite Difference Method–Determining Meso-parameter Discrete Element Method). This method enables direct calculation and assignment of meso-parameters required for the numerical model based on unsaturated soil theory, completely circumventing the laborious and subjective inverse calibration process inherent in conventional DEM. In this study, a 3D numerical model was established by using this coupling method and a parametric analysis was carried out. The results demonstrated that the meso-structure failure of silty clay within a certain range from the interface produced plastic deformation to form shear bands. Failure has two forms, namely, shear failure inside the shear band and shear failure outside the shear band. The increase in water content weakened the bonding force between particles, so that developing shear stress outside the shear band was difficult, resulting in typical shear failure inside the shear band. These findings could provide certain design references for the construction of foundation engineering in the Songnen Plain area.
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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
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