基于Voronoi模型的饱和土建模机理研究  

Study on modeling mechanism of saturated soil based on voronoi model

作　　者：田东弘 李明宝[1] 张旭[1,2] 杨忠翰 孙玉琢 朱玉婷 TIAN Donghong;LI Mingbao;ZHANG Xu;YANG Zhonghan;SUN Yuzhuo;ZHU Yuting(School of Civil Engineering,Northeast Forestry University,Harbin 150040,China;Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China)

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2019年第6期75-82,共8页Earthquake Engineering and Engineering Dynamics

基　　金：中央高校创新团队持续发展专项基金项目(2572017ET04);哈尔滨市优秀学科带头人基金项目(2013RFXXJ033)~~

摘　　要：土颗粒是构成饱和地基的重要基础,因此无论用何种方法分析饱和地基时,均不能忽视土颗粒的物理性质。用传统方法计算时均假设土是均质、各向同性的,不考虑实际土颗粒的粒径和形状,与实际情况不符。本文采用了不同形核点数的不同不规则度的Voronoi网格划分模拟了实际土颗粒的结构,建立有限元模型并进行数值分析。计算结果表明,在不同时刻沿深度的孔压数值、有效应力分布和固结度等方面,采用该Voronoi网格划分的有限元模拟结果和太沙基常规模型的理论解进行对比,计算结果趋于一致,说明Voronoi图在对土体划分时是可行的,并且该模型在进行饱和土体一维固结的相关参数计算时具有很好的精度。Soil particles are significant factors of saturated foundation. Therefore, no matter what method is used toanalyze saturated foundation, the physical properties of soil particles can not be ignored. The traditional method as­sumes that the soil is homogeneous and isotropic,regardless of the size and shape of the actual soil particles,whichis obviously inconsistent with the actual situation. In this paper,Voronoi meshes with different irregularities of dif­ferent nucleation points are used to simulate the structure of actual soil particles, establish finite element model andcarry out numerical analysis. The results show that the numerical values of pore pressure,the distribution of effec­tive stress and consolidation degree along depth at different time are similar with the theoretical solution of the con­ventional model of Terzaghi. The results are consistent which illustrates Voronoi diagram is feasible for soil classifi­cation ,and the model has good accuracy in calculating the parameters of one-dimensional consolidation of saturatedsoil.

关 键 词：VORONOI 饱和土 不规则度 一维固结 ABAQUS 

分 类 号：TU4[建筑科学—土工工程]