plaxis的莫尔库仑模型中的Eref怎么取值？ [复制链接]

plaxis的莫尔库仑模型中的Eref怎么取值？和试验数据Es有什么关系？

Es:  Es is obtained by consolidation test or by empirical relationship with site test(such as cone

penetration test) , actually Es is assumed as constrained modulus (Eoed). In this case, the strain

is not zero only in compression direction.  By Hook's law, strains in the other two directions=0,

E=Eoed * (1+v) *(1-2v)/(1-v)

When using Mohr-Coulomb model in PLAXIS, Eref (the parameter in input window) is referred to Eref(50) that means the modulus of soil  E. It is independent of stress level.

Here, finally, Eref=Es * (1+v) *(1-2v)/(1-v)

But remember, all these are for drained condition. You should use effective Poisson's ratio.

For undrained condition, you may get  Eu value from test or some empirical equations(Eu=a*Su), you should change Eu to E(effective value):

E=2*Eu*(1+v)/3

对于国内的Es,都是固结试验的值,应该可以理解为有效应力状态的模量.