天然花岗岩残积土大孔隙水分迁移特征的染色示踪试验  

Dyeing tracing experiment on the characteristics of macropore water migration in natural granite residual soil

作　　者：蔡沛辰 阙云[1] 李显 CAI Peichen;QUE Yun;LI Xian(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2022年第2期244-248,共5页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41772297);福建省自然科学基金资助项目(2018J01771)。

摘　　要：选取福州某地山坡天然花岗岩残积土为研究对象,借助亮蓝染色剂开展大孔隙水分迁移入渗试验,对原生态土体大孔隙分布特征及水分入渗情况进行研究.结果表明:天然土体表层土质松散、孔隙分布均匀,水分以均质流形式下渗为主,但同时部分大孔隙通道分布方向各异,存在高度不均匀性,水分与基质域间存在不同程度水分交互现象;染色面积随入渗深度呈先增大后减小趋势,水分浸入区域主要分布在土体表层,浸入量高达80%以上.该研究成果可为土体大孔隙水分迁移数值仿真中孔隙与基质域的边界条件设定提供借鉴.The natural granite residual soil of a mountain slope in Fuzhou was selected as the research object.With the aid of brilliant blue dye,the macropores water migration and infiltration test were carried out to study the distribution characteristics of macropores and water infiltration in the original ecological soil.The results showed that the surface layer of natural soil was loose and pores were evenly distributed,and the water seepage mainly in the form of homogeneous flowed.However,the distribution directions of some macropore channels were different,and there was a high degree of unevenness,so that the macropore flow had different degrees of water interaction with the matrix domain.The dyeing area first increased and then decreased with the infiltration depth.The water immersion area was mainly distributed on the surface of the soil,and the immersion amount exceeded 80%.The research results will provide a reference for setting the boundary conditions of pores and matrix domains in numerical simulation of soil macropore’s water migration.

关 键 词：天然花岗岩残积土 染色示踪试验 大孔隙 水分迁移 

分 类 号：TU42[建筑科学—岩土工程]