[探讨]问题6：在摩尔-库仑 模型中 是怎么判定 何时会有塑性变形？何时破坏？ [复制链接]

引用第7楼daniellb1023于2007-08-31 20:20发表的  : d6}r#\  
想问几个问题。 D0&,?  
1。plaxis 里面的plastic point 应该就是你说塑性点。我想问，这些点是不是就是接近fail的点？如果run construction sequence的时候，如果不能运行下去，出现错误，是不是说明是这些点fail了？那么请问应该怎么做才可以让你的程序继续运行。或者应该做些什么improvement 工作？ 谢谢。
In M-C Model, the plastic start from the failure point (these two start point is the same point). When the soil yield, it failure. But the plastic strain can still be calculated.  Normally, the program still can continue to proceed untill the big strain occur (big crack in some where).
2。你的帖子里面说，如果是undrain conditioin的soil,从塑性和弹性来说，你建议用effective stress的方法来算。不过一般undrain condition的土都是clay / clayey soil.那么按经验+理论来说，不是一般都作total stress analysis的吗？这样不就是有矛盾之处了吗？
You may read my previous posts.  For undrained condition, there are three options in PLAXIS:
A) analysis in terms of effective stresses (undrained material with E', v', Z0x ar]4V  
c', phi' and psi')
B) analysis in terms of effective stresses with undrained strength WejYy|  
parameters (undrained material with E', v', but with c_u, phi=0)
C) analysis in terms of total stresses (material is drained and dry, or non bv]`!g: C  
porous, E_u, v_u, c_u and phi = 0)
3。在plaxis运行中，如果你想对改土进行total stress analysis，是不是就是把这个土的parameter都输入undrain的？gama wet 约=gama dry， 输入c/phi? 如果你要对改土进行effective stress analysis,就输入drain的condition? 输入c', phi', gama wet>> gama dry? 
A),B),C) can answer this question two!
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