FLAC3D能表征基质吸力吗？？

巧遇

FLAC3D能表征基质吸力吗？？
采用FLAC3D计算，得到负孔压，请问这可以算是基质吸力吗？？

模型中没有加水力梯度，孔压约束只加在图中两个面上，其他面由程序自动计算，

set gravity = 10.0

model fl_iso
prop perm 2.18E-10 poro 0.4  biot_c 1   ;no1
ini fmod 2e9
ini fdensity 1000
ini pp 0.0 range z -0.01 0.01 x -3 0
ini pp 0.0  range z 5.9 6.1

whutzll

建议参考FLAC2D手册中两相流理论有关Van Genuchten公式

巧遇

谢谢
3D方面有吗？？

巧遇

Both explicit and implicit fluid-flow solution algorithms are available for fully saturated
simulations. An explicit method of solution is used for saturated/unsaturated flow.

FLAC3D肯定能作非饱和流的。
一定要把它啃下来。

巧遇

FLAC3D does not represent capillary, electrical or chemical forces between particles of a partially saturated material. However, it is possible to introduce such forces by writing a FISH function that supplies the appropriate internal stresses, based on the local saturation, porosity and/or any other relevant variable. Similarly, the effect of variable fluid stiffness due to dissolved air is not explicitly modeled, but a FISH function may be used to vary the local fluid modulus as a function of pressure, time, or any other quantity.

183452529

对比了3d和2d的描述,2d比3d多了capillary

[ 本帖最后由 183452529 于 2008-5-22 10:59 编辑 ]

hh199422

不能，虽然有负压，但不会影响有效应力，不知为什么3d不在这方面继续改进

LinQyxy

楼主加进去了没有。

syx2006

在Fluid-Mechanical Interaction 20页 1.3.3 Saturated/Unsaturated Flow 有专门的介绍，须对其饱和方程做一些修改才行。