摘要
通过变水头渗透实验、压汞实验,分别从宏观角度和微观角度研究掺砂比对改良土渗透性的影响规律,并从微观角度解释其内部孔隙特征的变化情况.结果表明:粉砂土的掺入增加了土体的渗透性,微观上表现为孔隙结构的改变,粉砂土与膨胀土中的矿物质发生胶结作用,使改良土中的团粒间孔隙与团粒子内孔隙增加,颗粒内孔隙减少;将渗透系数与孔隙特征参数进行拟合,得出大孔隙百分比与土体渗透系数拟合度最高,中孔隙百分比次之;大孔隙百分比,临界孔径对土体渗透系数影响较大,能够为该膨胀土地区实际工程施工建设提供重要理论参考.
Through variable head permeability test and mercury injection test,we studied the influence of sand ratio on permeability of improved soil from macro and micro perspectives,and explained the change of internal pore characteristics from a micro perspective.The results show that the incorporation of silty silt increases the permeability of soil,microscopically changing the pore structure and the cementation of minerals in silty silt and expansive soils,increasing interparticle and intraparticle pores in improved soils,and reducing the porosity in particles;fitting the permeability coefficient and pore characteristic parameters,it is found that the fitting degree of porosity percentage and soil permeability coefficient is the highest,and percentage of medium pores takes the second place;percentage of macropores and critical pore size have obvious influence on permeability coefficient of soil,which can provide important theoretical reference for the actual engineering construction in the expansive soil area.
作者
邱翱博
王欢
张旭
曹义康
杨惠如
QIU Aobo;WANG Huan;ZHANG Xu;CAO Yikang;YANG Huiru(School of Civil Engineering and Architecture,Henan University,Henan Kaifeng475004,China)
出处
《河南大学学报（自然科学版）》
CAS
2021年第5期614-623,共10页
Journal of Henan University:Natural Science
基金
河南省高等学校重点科研项目(18A580002)
开封市科技发展计划项目(1801004)
甘肃省交通运输厅科研项目(2013-07)
关键词
膨胀土
粉砂土
渗透系数
压汞法
孔隙特性
expansive soil
silty soil
permeability coefficient
mercury intrusion method
pore characteristic
作者简介
邱翱博(1993-),男,河南平顶山人,硕士研究生.研究方向:路基特殊土处理;通讯作者:王欢,E-mail:happy_king0924@sina.com
