深厚砂卵砾石透水坝基渗流控制方案研究  

Study on Seepage Control Schemes of Deep Sand and Gravel Permeable Dam Foundation

作　　者：刘阳[1,2] 毛海涛 侍克斌[1] 王正成[2] LIU Yang;MAO Haitao;SHI Kebin;WANG Zhengcheng(College of Water Conservancy and Civil Engineering, Xinjiang Agriculture University, Urumqi 830052, Xinjiang, China;College of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [2]重庆三峡学院土木工程学院,重庆404100

出　　处：《水力发电》2019年第5期62-66,共5页Water Power

基　　金：国家自然科学基金项目(41602367);重庆市科委基础与前沿研究计划项目(cstc2018jcyjAX0673);重庆市教委科学技术研究项目(KJ1601017);自治区高校科研计划重点项目(XJEDU2016I022)

摘　　要：针对西南山区典型小河道深厚砂卵砾石地基渗流进行了系统研究和方案对比,结论如下:单位长度垂直防渗墙大于单位长度水平铺盖的渗流控制效果,4. 63 m水平铺盖长度相当于1 m防渗墙;采用联合防渗时,随着防渗墙深度增加,联合防渗中的水平铺盖长度对渗流量的影响逐渐降低;当联合防渗中水平铺盖长度超过3倍水头时,出逸坡降变化呈均匀下降; 10 m防渗墙的防渗效果等同于40 m水平铺盖+6 m防渗墙、30 m水平铺盖+8 m防渗墙、20 m水平铺盖+9 m防渗墙的联合防渗效果;山区小河道不建议采用封闭式垂直防渗,建议采用联合防渗。The seepage of deep sand and gravel permeable dam foundation in typical small channels in southwest mountainous areas is studied and the seepage control schemes are compared. It is concluded that,(a) the seepage control effect of per unit length vertical cut-off wall is greater than that of per unit length horizontal blanket, and the length of horizontal blanket of 4.63 m is equivalent to that of 1m cut-off wall;(b) when the united seepage control is adopted, the influence of horizontal blanket length on seepage flow gradually decreases with the increase of the depth of cut-off wall;(c) when the length of horizontal blanket in united seepage control exceeds 3 times of water head, the change of escape slope drops evenly;and (d) the anti-seepage effect of 10 m cut-off wall is equivalent to the combination of 6m cut-off wall and 40 m horizontal blanket, 8 m cut-off wall and 30 m horizontal blanket, and 9 m cut-off wall and 20 m horizontal blanket respectively. It is not recommended to use closed vertical anti-seepage scheme in small channels in mountainous areas, but the united seepage control scheme is recommended.

关 键 词：深厚覆盖层 砂卵砾石 小河道 坝基渗流 控制方案 水平铺盖 垂直防渗墙 联合防渗 

分 类 号：TV640.31[水利工程—水利水电工程] TV698.233