摘要
针对现状条件下黄河大堤处于饱和-非饱和状态的事实,利用饱和-非饱和土系统的二维渗流模型对黄河大堤进行了渗流分析,结果表明:①浸润线瞬变位置在水位变化初期变化较快,随着时间的推移逐渐变慢;②等势线从饱和区向非饱和区扩展,说明在等势线间的水头差作用下,饱和区和非饱和区内都有水的流动;③由堤防顶部到底部,压力水头逐渐由正值变到负值,坝中央等压线几乎与浸润线平行;④流速矢量开始时垂直于地面,逐渐向堤内偏转,在坝中央部分平行于浸润线,在坝趾位置几乎垂直于坝趾,且浸润线上、下皆存在流速矢量。
The paper analyzes the seepage of the Yellow River embankments by using two-dimensional seepage model of saturated and unsaturated soil system and in accordance with the fact of saturated and unsaturated status of the river embankments.The outcomes show that a) the transient location of phreatic line changes fast at the initial period of water level variation and getting slower along with the time;b) equipotential line extends from saturated zone to unsaturated zone,showing the water flow in the saturated and unsaturated zones under the actions of head fall between equipotential lines;c) hydraulic head changes gradually from positive to negative from dyke top to bottom and isobar of central embankment is almost parallel with the phreatic line and;d) at the beginning,velocity vector is vertical to the surface,gradually turns into the inside of dyke and partially becomes parallel with the phreatic line.It is almost vertical to the dyke toe at the toe location.The velocity vector exists both in the above and below the phreatic line.
出处
《人民黄河》
CAS
北大核心
2009年第11期18-20,共3页
Yellow River
关键词
流速矢量
水头
浸润线
渗流分析
饱和-非饱和土
黄河大堤
velocity vector
water head
phreatic line
seepage analysis
saturated and unsaturated soil
the Yellow River embankments
