土体的充气阻渗试验  

Experimental investigation of seepage barrier effect by air-inflation in soil

作　　者：刘长殿[1] 孙红月[1] 康剑伟[1] 杜丽丽[2] 

机构地区：[1]浙江大学海洋学院,浙江杭州310058 [2]浙江大学建筑工程学院,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2014年第2期236-241,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(41372277);国家"十二五"科技支撑计划资助项目(2012BAK10B06);浙江省留学回国启动基金资助项目(J20120096)

摘　　要：针对降雨诱发滑坡的作用机理,提出一种边坡充气截排水方法.考虑气压作用,进行一维土柱积水入渗试验,分别开展自然入渗和充气入渗2个过程的模拟,观测湿润锋面的推进过程,进行土柱不同深度容积含水量的实时监测.在考虑气压对容积含水量和湿润锋推进影响的基础上,建立充气阻渗效果的评价方法.试验结果表明:向土体中充气能够显著减缓湿润锋面的推进速度;在充气条件下,气压可以使土体维持一定的容积含水量梯度;对于试验模型,充气气压为10kPa条件下,入渗20min时,土壤入渗率约为自然入渗的1/2.This paper presents a method to cutoff or drain underground water by inflating air into slope according to the landslide induction principle by rainfall. The natural infiltration and air-inflation infiltration were simulated by a laboratorial ponding infiltration test considering the influence of air pressure. The development of wet front was observed and the volumetric moisture content of different depths was investigated in the test. Subsequently, a method for the evaluation of seepage barrier effect by air-inflation was developed considering the air pressure effects on the wet front and volumetric moisture content. The results indicate that the air-inflation in soil significantly decreases the rate of wet front development. The air pressure can keep the volumetric moisture content gradient in the soil in the case of air-inflation. In the present study, the air-inflation infiltration rate is around 1/2 of the natural inflation infiltration rate after 20 minutes infiltration under the air pressure of 10 kPa.

关 键 词：充气 阻渗作用 湿润锋面推进速率 容积含水量 

分 类 号：TU41[建筑科学—岩土工程]