ANALYSIS OF THREE DIMENSIONAL SEEPAGE FOR FILL TYPE DAM AND VALLEY SYSTEM

本文采用有限元方法和砂模型试验，对填筑式坝谷系统的三维渗流进行了分析。对于填充型，大坝和山谷系统设置为山谷形式的类型(1)和类型(2)。类型(1)为V型，类型(2)为谷形的三棱柱模型。(1)通过有限元分析和模型试验，分析了坝顶长度、坡度、坝肩等因素的变化情况；(2)坝体形状的渗流面与坝体的这些因素有关；(3)(1)型渗流线(h线)向坝趾排水汇聚，而(2)型(2)向下游扩散；(4)在一定条件下，(1)型渗流点出现在下游高水位处。(5)这些结果不能用二维渗流来分析。

In the present paper, the three dimensional seepage were analyzed by finite elements methods and Sand model examination for Fill type dam and Valley system. For the fill type dam and valley system are setting to the type (1) and the type (2) of the valley's form. THe type (1) is V model, and the type (2) is triangular prism model of the valley's form.A summary of results obtained is shown below ;(1) The chenginng in the factor, scale of crest length, slope and abutment of dam, were analyzed by finete element metords and the sand model examinations..(2) A seepage surface of shape are related these factors of dam.(3) The flow lines (h lines) of type (1) converges to toe drain of dam, but the type (2) are diffused to the lower reaches of dam.(4) The seepage points of type (1) are occurred in the high level of downstream slope under certain conditions.(5) These results cannot be obtained analyzes by the two dimensional seepage.