EPS颗粒含量对混合土渗透性的影响  

Effect of EPS particle content on permeability of mixed soil

作　　者：叶文 黄林冲 YE Wen;HUANG Linchong(School of Intelligent Systems Engineering,Sun Yat-sen University,Guangzhou 510006,China;School of Aeronautics and Astronauctics,Sun Yat-sen University,Shenzhen 518107,China)

机构地区：[1]中山大学智能工程学院,广东广州510006 [2]中山大学航空航天学院,广东深圳518107

出　　处：《中山大学学报（自然科学版）（中英文）》2021年第6期15-23,共9页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：广州市产学研协同创新重大专项(201704020139);深圳市自然科学基金面上项目(JCYJ20190807162401662);深圳市2020年可持续发展科技专项(KCXFZ202002011008532)。

摘　　要：为了研究聚苯乙烯(EPS)颗粒含量对混合土渗透性的影响,利用常水头渗透仪测定河源石英砂、福建标准砂与EPS颗粒的混合土在EPS颗粒质量分数分别为0、0.2%、0.4%、0.6%、0.8%和1%共六种掺量下的渗透系数。提出图像处理方法,用于计算颗粒的粒径分布;基于柯森-卡门渗透公式,拟合无因次参数C_(0)与EPS颗粒含量之间的关系;基于泊肃叶定律,建立渗透物理模型。研究表明,混合土中EPS颗粒对混合土的不均匀系数和曲率系数的影响很小;随着EPS颗粒含量的增大,混合土的密度及孔隙率均减小;颗粒的形态对孔隙率具有较大的影响;混合土的渗透系数随EPS颗粒含量的增加呈二次函数变化,河源石英砂混合土的渗透性高于福建标准砂混合土;由于颗粒形态的不同,产生的水头损失也将不同,引入叠合系数对这部分损失进行描述,通过拟合证实叠合系数与EPS颗粒含量呈线性变化。In order to study the effect of EPS particle content on the permeability coefficient of mixed soil,the permeability coefficient of the mixed soil of Heyuan quartz sand,Fujian standard sand,and EPS particles were measured with a normal water head permeameter at six kinds of blending amounts: 0,0. 2%,0. 4%,0. 6%,0. 8% and 1% . To obtain a more accurate particle size distribution and average particle size of mixed soil, image processing methods and average particle size calculation methods are proposed. Based on the Coson-Carmen permeability formula,the relationship between the dimensionless parameters C_(0) and EPS particle content are fitted. Based on Poiseuille's law,a physical model of infiltration is established. The research results show that the EPS particles in the mixed soil have little effect on the heterogeneity coefficient and curvature coefficient of the mixed soil;as the EPS particle content increases,the density and porosity of the mixed soil decrease;the shape of the particles has a significant effect on the porosity;the permeability coefficient of the mixed soil changes quadratically with the increase of the EPS particle content. The permeability of the Heyuan quartz sand mixed soil is higher than that of the Fujian standard sand mixed soil. Due to the different particle forms,the head loss will also be produced differently,the superposition coefficient is introduced to describe this part of loss. It is confirmed by fitting that the superposition coefficient and the content of EPS particles change linearly.

关 键 词：轻量土 EPS含量 渗透系数 柯森-卡门渗透公式 叠合系数 

分 类 号：TU43[建筑科学—岩土工程]