Microscopic mechanical analysis of K0 of granular soils with particle size distribution and rolling resistance effects

IF 2.8 3区工程技术 Q1 MATHEMATICS, INTERDISCIPLINARY APPLICATIONS

Computational Particle Mechanics Pub Date : 2023-10-25 DOI:10.1007/s40571-023-00669-9

Tao Zhang, Sui Wang, Shuyang Yu, Zhaohua Sun, Chuanfeng Fang, Shuren Wang

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Abstract

The coefficient of lateral earth pressure at rest, K₀, is an essential parameter for analyzing earth pressure distribution and the safe reliability of structures in geotechnical engineering. This paper presents a series of numerical one-dimensional compression tests on granular soils with particle size distribution (PSD) and rolling resistance (RR) effects using a real-particle 3D discrete element model. The corresponding macro–micro behaviors are investigated in a parallel way. Both PSD and RR affect K₀ and the related compression characteristics. A higher coefficient of uniformity (C_u) or rolling resistance coefficient (μ_r) results in a monotonic decrease in the mean coordination number, and too much consideration of RR makes the mean coordination number less realistic in a particle system. The influence of PSD is more sensitive to the local-ordering structure and contact force network than the RR. The inhomogeneity of normal contact forces enhances as C_u increases and slightly reduces as μ_r increases. The strong contacts are much more anisotropic than the weak ones. Specimen with lower C_u or higher μ_r induces higher anisotropy and more strong contacts during compression, in which a lower K₀ is measured. A unique macro–micro relationship exists between K₀ and deviatoric fabric when strong contacts are considered only.

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具有粒度分布和滚动阻力效应的粒状土 K0 的微观力学分析

静止时的侧向土压力系数 K0 是岩土工程中分析土压力分布和结构安全可靠性的重要参数。本文采用实颗粒三维离散元模型，对具有粒度分布（PSD）和滚动阻力（RR）效应的颗粒土进行了一系列一维压缩数值试验。同时研究了相应的宏观-微观行为。PSD 和 RR 都会影响 K0 以及相关的压缩特性。较高的均匀系数（Cu）或滚动阻力系数（μr）会导致平均配位数单调下降，而过多地考虑 RR 会使平均配位数在粒子系统中不那么真实。PSD 对局部排序结构和接触力网络的影响比 RR 更敏感。法向接触力的不均匀性随着 Cu 的增加而增强，随着 μr 的增加而略有减弱。强接触的各向异性远大于弱接触。Cu 值较低或 μr 值较高的试样在压缩过程中会产生较高的各向异性和较多的强接触，从而测得较低的 K0。仅考虑强接触时，K0 和偏差织物之间存在独特的宏观-微观关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Computational Particle Mechanics Mathematics-Computational Mathematics

CiteScore

5.70

自引率

9.10%

发文量

期刊介绍： GENERAL OBJECTIVES: Computational Particle Mechanics (CPM) is a quarterly journal with the goal of publishing full-length original articles addressing the modeling and simulation of systems involving particles and particle methods. The goal is to enhance communication among researchers in the applied sciences who use "particles'''' in one form or another in their research. SPECIFIC OBJECTIVES: Particle-based materials and numerical methods have become wide-spread in the natural and applied sciences, engineering, biology. The term "particle methods/mechanics'''' has now come to imply several different things to researchers in the 21st century, including: (a) Particles as a physical unit in granular media, particulate ﬂows, plasmas, swarms, etc., (b) Particles representing material phases in continua at the meso-, micro-and nano-scale and (c) Particles as a discretization unit in continua and discontinua in numerical methods such as Discrete Element Methods (DEM), Particle Finite Element Methods (PFEM), Molecular Dynamics (MD), and Smoothed Particle Hydrodynamics (SPH), to name a few.