红土特性及水温对其渗透系数的影响研究  

Study on the Influence of the Character of Laterite and Water Temperature on Its Permeability Coefficient

作　　者：邱观贵 张祖莲[1] 袁强 李锐华 任国榕 QIU Guan-gui;ZHANG Zu-lian;YUAN Qiang;LI Rui-hua;REN Guo-rong(College of Electrical Engineering,Kunming University of Science and Techonlogy,Kunming 650500,China)

机构地区：[1]昆明理工大学电力工程学院,昆明650504

出　　处：《价值工程》2018年第23期218-222,共5页Value Engineering

摘　　要：针对不同干密度和初始含水率的红土,分别在不同水温条件下,通过变水头渗透试验和理论分析相结合的方法,分析渗透系数随干密度、初始含水率及水温变化的规律,揭示干密度、初始含水率及水温条件变化时对红土渗透系数造成的影响。结果表明:(1)当红土干密度为1.1g·cm^(-3)~1.4g·cm^(-3)时,红土渗透系数随干密度增大而减小。随着干密度增大,水温和初始含水率对红土渗透系数的影响越来越小。(2)当初始含水率小于等于26%时,红土渗透系数随初始含水率增大而减小;当初始含水率大于26%时,红土渗透系数急剧减小。初始含水率为26%时,红土渗透系数取得极大值。(3)红土渗透系数在降温区(5℃~25℃)随水温升高而增波折大,在升温区(25℃~40℃)随水温升高而波折降低。水温为25℃时,渗透系数出现极大值。说明水温为25℃时,对红土渗透系数的影响最大。Considering the laterite with different dry density and initial water content under different water temperature conditions, this paper reveals the influence of the change of dry density, initial water content and water temperature on the osmotic coefficient of laterite.The method of combining geotechnical tests with variable head permeability test is used to analyze the variation of permeability coefficient with dry density, initial water content and water temperature. The results show that：（1）When the dry density of laterite is between 1.1 g·cm^（-3） and 1.4 g·cm（-3）, the permeability coefficient of laterite will decreas with the increasing of dry density. With the increasing of dry density, the influence of water temperature and initial water content on the permeability coefficient of laterite is becoming smaller and smaller.（2）When the initial moisture content is less than or equal to 26%, the permeability coefficient of laterite will decreas with the increasing of initial water content. When the initial moisture content is greater than 26%, the permeability coefficient of laterite wil decreas sharply. When the initial water content is 26%, the permeability coefficient of the aterite is a local maximum.（3）The permeability coefficient of laterite in the cooling zone（5℃~25℃） will increase with the increase of water temperature, and decreas with the increase of water temperature in the heating zone（25℃~40℃）. When the water temperature is 25℃, the permeability coefficient is a local maximum. It is indicated that when the water temperature is 25℃, the influence on the permeability coefficient of laterite is the greatest.

关 键 词：干密度 含水率 水温 变水头渗透试验 渗透系数 

分 类 号：TV223.4[水利工程—水工结构工程]