求助SEEP/W中渗透系数的填入问题

xndst

我也发现了这个问题，还没有深入研究，看到高手的意见。是我受益匪浅啊

wj0099

回去试一试

tqtimtdh

谢谢各位，学习

飞天独霸

这几天，正做做这个，在分析设置中，一般用稳态还是非稳态了，与有什么有关系，是不是非稳态分析降雨变化的情况，就是瞬态分析了

lidongguang

学习了，我也纠结这个问题那，貌似懂了一点点，谢谢各位大大

dyt0502

降雨入渗的问题一般考虑的就是瞬态，除非渗透系数特别的大，或者是降雨强度很大的情况可以考虑稳态计算，这个根据具体情况而定！

hongwei0901

u better give a reasonable curve  you think, if use horizontal line,  the results are not accurate, if you use defined curve, it will give u more  accurate results even the curve is you defined, not a series of lab data..

hongwei0901

A hydraulic conductivity function should be specified for all materials in a
problem that will have an unsaturated zone. Even if the hydraulic conductivity
function is an estimate, the results will be more realistic than if the function is
entered as a flat horizontal line. In a unsaturated seepage analysis with negative
surface fluxes (such as evaporation) where negative pressures can become
extreme, the conductivity function should be defined over a pressure range that
exceeds several hundred thousand kPa (or equivalent) of negative pressure. If the
function is not defined over the full range, the lowest specified value will be used
for any increasingly negative pressures.
Adopting a perfectly flat hydraulic conductivity function (i.e., a constant
conductivity) for an unsaturated soil can lead to unrealistic results. The phreatic
surface may end up at an unrealistic position, and the proportion of flow through
the unsaturated zone may be too high. This occurs because with a horizontal
conductivity function, water can flow through the unsaturated zone with the same
ease as through the saturated zone. In other words, for a given constant head
differential, the volume of flow is the same in the unsaturated zone as in the
saturated zone when the hydraulic conductivities in the two zones are the same. In
general, water cannot flow through unsaturated soil with the same ease as through
saturated soil, because the unsaturated hydraulic conductivity is lower than that of
a saturated soil.

IvanCordoba

lxq99005 发表于 2008-4-9 20:13
饱和时候的渗透系数是斜直线还是水平直线 ( 随负压的增加渗透系数不变）呢?，这个可是关键的问题哦！还有渗 ...

这个问题我也有疑惑
看了一篇论文，a取值大概在0.03左右，可软件默认100不知道是不是单位问题
公式里n=1-1/m
软件m=2时   n应该为0.5软件默认1，很不解啊

卡尔_carl

楼上的，n的取值，软件默认值1是错的

qinrong_0305

正在学习中。。。

xiaomeng123

以前看了不懂，现在懂了点。