基于细观模拟的土石混合体固结特性研究  

INVESTIGATION ON CONSOLIDATION CHARACTERISTICS OF SOILROCK MIXTURES UPON MESOSCOPIC SIMULATIONS

作　　者：龚文平 赵晓宇 李馨馨 赵超[1] GONG Wen-ping;ZHAO Xiao-yu;LI Xin-xin;ZHAO Chao(Faculty of Engineering,China University of Geosciences,Wuhan,Hubei 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《工程力学》2024年第10期118-127,共10页Engineering Mechanics

基　　金：国家自然科学基金青年基金项目(42002287)。

摘　　要：土石混合体具有特殊的结构特性,当前数值模拟研究主要聚焦于强度和变形特征,较少从细观尺度探究其固结特性。该文引入无厚度单元法模拟土-石接触面并验证了其有效性,在此基础上构建了土石混合体结构随机分布模型,从细观尺度上探究了内部结构特征(土-石接触面参数、块石形状、含量及级配)对土石混合体固结特性的影响规律。结果表明:当块石含量不变时,含圆形块石的土石混合体固结沉降最小,其次为椭圆形,含多边形块石的土石混合体固结沉降最大;随着含石量的增加,土石混合体沉降和孔隙比均减小;当含石量一定时,含大尺寸块石较多的土石混合体发生的固结程度较高。Soil-rock mixture(SRM)exhibits distinct structural characteristics.Most of the existing studies are related to the strength and deformation behaviors of SRM;whereas,the studies on the consolidation behaviors of SRM are limited.In this study,the soil-rock interface is simulated by zero-thickness interface elements,and the effectiveness of the simulation method proposed is validated;then,the random aggregate model of the rock block within the soil matrix are constructed by Monte-Carlo simulation(MCS)method.Based on the mesoscopic simulations,the influences of the structural characteristics are investigated,including the rock proportion,shape,gradation,and soil-rock interface parameters,on the consolidation behaviors of SRM.The results indicate that the consolidation behavior of SRM can be strongly affected by the shape of rock.The consolidation settlement of SRM containing circular blocks is the smallest,followed by those containing elliptical blocks and polygonal blocks,respectively.With the increase of the rock proportion,the consolidation settlement,void ratio,and compressibility of SRM all decrease.And with respect to a specified proportion of rock,a higher degree of consolidation is presented for SRM containing larger rock blocks.

关 键 词：土石混合体 固结特性 土-石接触面 细观结构模拟 有限单元法 

分 类 号：TU45[建筑科学—岩土工程]