1.使用interface后再用attach是错误的，从z方向的变形就可以看出来，楼主的模型使用attach时的z方向位移云图（下面的interface-attach图）与我修改后的模型的z方向位移云图（下面的no-interface-no-attach图）有较大差别。而楼主的模型在不使用attach时的z方向位移云图（下面的interface-no-attach图）与我修改后的模型的z方向位移云图（下面的no-interface-no-attach图）相近。下面是我修改过的网格大小适应的模型。
;config dynamic
;set log on
new
;------create soil and placity board---------------
gen zone brick p00.0 0.0 0.0 p1 3.0 0.0 0.0 p20.0 2.4 0.0 p30.0 0.0 1.0 size 10 8 5;group soil
gen zone brick p0 -0.2 0.0 0.0 p1 0.0 0.0 0.0 p2 -0.2 2.4 0.0 p3 -0.2 0.0 1.0 size 18 5 ; group leftplacity
gen zone brick p03.0 0.0 0.0 p1 3.2 0.0 0.0 p23.0 2.4 0.0 p33.0 0.0 1.0 size 18 5;group rightplacity
gen zone brick p0 -0. -1.20.0 p13. -1.20.0 p2 -0. -1.00.0 p3 -0 -1.2 1.0 size 10 1 5 ;group front
gen zone brick p0 -0.3.40.0 p13.3.40.0 p2 -0.3.60.0 p3 -0.3.4 1.0 size 10 1 5 ;group behind
gen zone brick p0 -0.23.40.0 p103.40.0 p2 -0.23.60.0 p3 -0.23.4 1.0 size 1 1 5
gen zone brick p0 3.03.40.0 p13.23.40.0 p2 3.3.60.0 p3 33.4 1.0 size 1 1 5
gen zone brick p0 -0.2-1.20.0 p10-1.20.0 p2 -0.2-1.00.0 p3 -0.2-1.2 1.0 size 1 1 5
gen zone brick p0 3-1.20.0 p13.2-1.20.0 p2 3-1.00.0 p3 3-1.2 1.0 size 1 1 5
pause
;------create group-----------
group placity range x -0.2 0.0
group placity range x3.0 3.2
group soil range x 0 3
group box-1 range x -0.2 3.2 y -1.2 -0.2 z 0.0 1.0
group box-2 range x -0.2 3.2 y3.43.6 z 0.0 1.0
pause
;------create interface-------
interface 1 face range y 0.0
interface 2 face range y 2.4
ini y add1.0 range group box-1
ini y add -1.0 range group box-2
plot block group
pause
;----- interface parameters-------
;interface 1 prop ks 1e8 kn 1e5 fric 30
;interface 2 prop ks 1e8 kn 1e5 fric 30
;-----assign material parameters-----
model elas range group placity
prop bulk 6.88e6 shear 1.475e6
ini dens 15
model elas range group soil
prop bulk 5.2e7 shear 1.1e7 range group soil
ini dens 1760 range group soil
model elas range group box-1
prop bulk 6.88e6 shear 1.475e6 range group box-1
ini dens 1800 range group box-1
model elas range group box-2
prop bulk 5.2e9 shear 1.1e9 range group box-2
ini dens 1800 range group box-2
;--------fix boundary----------
fix x range x -0.2001 -0.1999
fix x range x3.19993.2001
fix y range y -0.2001 -0.1999
fix y range y2.59992.6001
fix z range z -0.00010.0001
;set dyna off
set grav 0 0 -10
;attach face
hist unbal
hist gp zdis 1.5 1.2 1.0
cy 1000
受教了，学到了很多关于attach和interface的用法 领教了，好的东西，谢谢楼主
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