土颗粒微观参数变化对砂土宏观力学指标影响的探究  

Exploration of the Relationship between Micro Parameter Changes of Soil Particles and Macro Mechanical Indicators of Sand

作　　者：孟祥彬 刘宏达 耿凯 MENG Xiangbin;LIU Hongda;GENG Kai(School of Resources and Civil Engineering,Liaoning Institute of Science and Technology,Benxi Liaoning 117004,China;Liaoning Research Center for Solid Waste Development and Utilization and Building Materials Engineering,Benxi Liaoning 117004,China)

机构地区：[1]辽宁科技学院资源与土木工程学院,辽宁本溪117004 [2]辽宁省固废开发利用与建材工程研究中心,辽宁本溪117004

出　　处：《辽宁科技学院学报》2025年第1期34-38,共5页Journal of Liaoning Institute of Science and Technology

基　　金：2024年辽宁省教育厅基本科研项目“深埋盾构隧道的结构性态研究”(2024JYTQN-19);2025年辽宁科技学院大学生创新创业训练计划项目(202511430095).

摘　　要：离散元作为一种能体现土体非连续性和复杂性的数值模拟分析方法近年来得到越来越广泛的应用。其中表征颗粒间相互作用的微观参数无法通过室内试验得到,却在离散元计算中起到非常重要的作用。文章运用离散元软件PFC2D进行大量双轴试验,探究土颗粒法相刚度、切向刚度、摩擦系数三种土颗粒微观参数对砂土宏观力学参数割线弹性模量和内摩擦角的影响,同时研究离散元模拟中关键参数土体级配、孔隙比对砂土割线弹性模量和内摩擦角的影响。研究表明,砂土的割线弹性模量受孔隙比、法向刚度、摩擦系数的影响较大,内摩擦角受摩擦系数和孔隙比的影响较大。离散元模拟土样时,可先通过调整土颗粒摩擦系数拟合土样内摩擦角,再通过调整土颗粒法向刚度拟合土样弹性模量。The discrete element method,a numerical analysis approach that can reflect the discontinuity and complexity of soil,has been widely used in recent years.The appropriate selection of micro parameters of soil particles is the key to the success of dis⁃crete element simulation.A large number of biaxial experiments was conducted by using the discrete element software PFC2D with the intent to explore the effects of soil gradation,porosity ratio,soil particle normal phase stiffness,tangential stiffness,and fric⁃tion coefficient on the secant elastic modulus and internal friction angle of sand.The results showed that the secant elastic modulus of sand is affected by porosity,normal stiffness,and friction coefficient,while the internal friction angle is affected by friction co⁃efficient and porosity ratio.

关 键 词：离散元模拟 土颗粒微观参数 土体宏观力学指标 

分 类 号：TU4[建筑科学—土工工程]