充气位置及压力对边坡截排水效果的影响  

Influences of Inflatable Location and Pressure on Draining of Slopes

作　　者：钱文见 尚岳全[1] 杜丽丽[2] 朱森俊 

机构地区：[1]浙江大学建筑工程学院,杭州310058 [2]浙江长征职业技术学院建工系,杭州310023

出　　处：《吉林大学学报（地球科学版）》2016年第2期536-542,共7页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金资助项目(41372277);"十二.五"国家科技支撑计划项目(2012BAK10B06)~~

摘　　要：充气截排水主要依据非饱和渗流理论,通过向坡体后缘压入气体驱除部分地下水,形成非饱和帷幕带,降低土体的渗透性,截排斜坡后缘地下水的入渗,降低潜在滑坡体内地下水位。多孔介质的多相渗流问题相当复杂,模拟技术往往是有效的研究方法。笔者以试验得到的地下水位及渗流量为基础进行数值反演分析,得到土质参数,构建数值计算模型,研究不同充气位置对边坡潜在滑坡区地下水位的影响。结果表明:在坡体后缘压入气体能够降低潜在滑坡区的地下水位线;在坡体后缘充气时,充气点放置在距离潜在滑坡区较近的位置时,截排水效果更好;充气点充气压力越大,潜在滑坡区的地下水位线下降得越多;选择充气点深度时,宜选择较深的充气深度,这样能够选择较大的充气压力。The method of intercepting water with compressed air for a landslide is mainly based on the unsaturated seepage theory,through filling the trailing edge of slope with compressed air to expel some groundwater,to form the unsaturated curtain belt,to intercept the groundwater seepage from the trailing edge of slope,and then to lower the groundwater level in a potential landslide.The multiphase seepage is quite complex,so the simulation technology is often the effective research method.Based on the groundwater level and the seepage quantity in the landslide model test,it＇s easy to get the soil parameter through numerical inversion analysis.To study the effects of groundwater level in potential landslide caused by different inflatable positions through constructing the numerical model,the authors get the conclusions as follows：the groundwater level of potential landslide area can be lowered by fillingand inflating the trailing edge of slope with compressed air;a better inflatable position should be closed to the potential landslide area.The greater the pressure of the inflatable point is,the more the groundwater level of the potential landslide area drops.When choosing the depth of the inflatable point,we should select a deeper one,so that a larger air pressure can be used.

关 键 词：滑坡 地下水 充气截排水 模型试验 数值模拟 

分 类 号：P642.22[天文地球—工程地质学]