非饱和橡胶粉土土水特征曲线及颗粒接触状态  

Soil-water characteristic curve and particle contact state of unsaturated rubber silt

作　　者：周恩全[1] 崔磊 姚缘 左熹[2] ZHOU Enquan;CUI Lei;YAO Yuan;ZUO Xi(Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,Jiangsu,P.R.China;Institute of Architectural Engineering,Jinling Institute of Technology,Nanjin 210000,P.R.China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013 [2]金陵科技学院建筑工程学院,南京210000

出　　处：《土木与环境工程学报（中英文）》2023年第6期104-112,共9页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(51508236);江苏高校“青蓝工程”资助项目(2021)。

摘　　要：将废旧轮胎与土混合作为建筑材料应用于土木工程领域是处理废旧轮胎最有前景的措施之一。为了研究废旧轮胎橡胶颗粒改良粉土的效果,以橡胶颗粒与粉土的混合土为研究对象,采用滤纸法测定橡胶粉土的土水特征曲线,分析含水率、橡胶含量对土水特征曲线的影响。结果表明:同一橡胶含量下,混合土的基质吸力随含水率增大非线性减少,呈现出典型的3阶段特征;在同一含水率下,基质吸力随橡胶颗粒含量呈先增大后减少的趋势,当橡胶含量为20%时,混合土的基质吸力最大;基于Van Genuchten模型建立混合土的土水特征曲线模式;基于颗粒接触理论,考虑颗粒比重不同,建立混合土的接触状态模式,构建骨架孔隙比描述混合土的非饱和特性,混合土的基质吸力随着骨架孔隙比的增加呈先增加后减小的趋势。Using the mixture of waste tires and soil as building materials in the field of civil engineering is one of the most promising measures to deal with waste tires.In order to study the effect of waste tire rubber particles on improving silt,taking the mixed soil of rubber particles and silt as the research object,the soil-water characteristic curve of rubber silt was measured by filter paper method,and the effect of different moisture content and rubber content on the soil-water characteristic curve was analyzed.The results show that at the same rubber content,the matrix suction of the mixed soil decreases nonlinearly with the increase of moisture content,showing a typical three-stage characteristic;at the same moisture content,the matrix suction increases at first and then decreases with the rubber particle content.When the rubber content is 20%,the matrix suction of the mixed soil is the largest.The soil-water characteristic curve model of mixed soil is established based on the Van Genuchten model.Based on the particle contact theory and considering the different specific gravity of particles,the contact state model of mixed soil is established,and the skeleton void ratio is constructed to describe the unsaturated characteristics of mixed soil.the matrix suction of mixed soil increase at first and then decrease with the increase of the skeleton void ratio.

关 键 词：橡胶粉土 土水特征曲线 滤纸法 基质吸力 骨架孔隙比 

分 类 号：TU411.91[建筑科学—岩土工程]