花岗岩残积土水土特征曲线的试验研究  

The experimental research on the soil-water characteristic curve of the granite residual soil

作　　者：汤连生[1] 颜波[2] 李振嵩[3] 于海涛[1] 林国威[1] 

机构地区：[1]中山大学地球科学系,广州510275 [2]中山大学应用力学与工程系,广州510275 [3]中水珠江规划勘测设计有限公司,广州510610

出　　处：《水文地质工程地质》2008年第4期62-65,79,共5页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目(50279056);广东省自然科学基金项目(07003738);广东省科技计划重点项目(2003C33301,2004B32801002)

摘　　要：本文采用渗析法测定花岗岩残积土的水土特征曲线,详细介绍了渗析法的试验步骤及注意事项,并对花岗岩残积土的水土特征曲线进行了分析。通过试验得到残积土水土特征曲线,无论是干燥段或是浸湿段,下降都较为平缓。花岗岩残积土的进气值较低,仅为10kPa左右,而土体残余含水量较大,为20%左右,说明花岗岩残积土持水能力较强。文章还对水土特征曲线的滞回圈进行了分析,认为水土特征曲线的滞回圈应该是由多种原因引起的。Using osmotic method in testing the soil-water characteristic curve of the granite residual soil, the paper introduces the steps of the experiment in detail, and points out the matters need attention. Through the result of the experiment, we found that the water-soil characteristic drops slowly in both the drying and the wetting processes. The granite residual soil has small entering air suction, only about 10kPa, however, the residual saturation degree value is about 20%. This indicates that the residual soil can retain much water. The paper also analyzed the hysteretic loop of the characteristic curve, and found that the hysteretic loop of the curve is caused by many reasons together.

关 键 词：渗析法 花岗岩残积土 吸力 

分 类 号：P642.116[天文地球—工程地质学] TU411.4[天文地球—地质矿产勘探]