沙土上升毛管水运动特性研究  

A Study on Capillary Water Movement Characteristics in Sandy Soil

作　　者：董荣泽 于明英 邱照宁 肖娟[1] DONG Rong-ze;YU Ming-ying;QIU Zhao-ning;XIAO Juan(Taiyuan University of Technology, Taiyuan 030024, Shanxi Province, China;Sandband Teehnology Ltd, Beijing 100080, China)

机构地区：[1]太原理工大学水利科学与工程学院,山西太原030024 [2]沙帮科技有限公司,北京100080

出　　处：《节水灌溉》2018年第4期19-25,共7页Water Saving Irrigation

基　　金：山西省自然科学基金(201701D121107);国家自然科学基金项目(51309175)

摘　　要：为了研究地下水对土壤的补给和影响,通过室内试验研究恒定地下水位条件下,不同地下水质(钠吸附比SAR和盐分浓度C)对不同粒径沙土中的地下水补给以及水盐运移分布的影响。结果表明:毛管水上升高度随时间的增加而增加,二者之间存在明显的对数函数关系;毛管水上升速率随时间的增大不断减小最后趋于0;沙土含水率沿着毛管水上升方向不断减小;地下水补给总量随沙土粒径的增大而减小;沙土中盐分的分布情况与溶液的盐分浓度有关,当溶液的盐分浓度较小且取土点与地下水面距离h较小时,沙土各部分的盐分浓度相差不大,h较大时沙土盐分浓度随h的增大而增大;当溶液的盐分浓度较大时,沙土的盐分浓度随h的增大而减小。In this paper, the movement characteristics of water with different water quality in different sizes sandy soil under constant groundwater level are studied through laboratory test. The results show that the rising height of capillary water increases with the increase of time, and there is a logarithmic function relationship between them ; the rising rate of capillary water decreases with the increase of time, and finally tends to zero; the moisture content of sandy soil decreases continuously along the rising direction of capillary water; the total recharge of groundwater decreases with the increase of particle size of sandy soil; the distribution of salt in sandy soil is related to the salt concentration of the solution; when the salt concentration of solution is smaller and the distance between soil sampling point and ground water surface, h, is less than 40 cm, the salt concentration of each part of sandy soil is not much different; when h is larger than 40 cm, the salt content of sandy soil increases with the increase of h.

关 键 词：沙土 毛管水上升运动 毛管水上升高度 含水率 盐分分布 

分 类 号：TU441.32[建筑科学—岩土工程]