衬砌单元
flac3d中：
;attach the foundation
; Create the concrete liner.
;sel linersel id 1 ele dkt nod 43 64 85
;sel liner PROP iso=( 25e9, 0.15) thick=0.3 ; concrete
;sel liner PROP cs_nk=8e8 cs_sk=8e8 &
;cs_ncut=4e6 cs_scoh=4e6 cs_scohres=2e6 cs_sfric=20.0
;sel liner apply pressure 100e3
;attach the foundation
;Create the concrete liner.
sel linersel id 1 ele dkt_csth nod 106 148 127
sel linersel id 2 ele dkt_csth nod 106 169 148
sel linersel id 3 ele dkt_csth nod 106 211 169
sel linersel id 4 ele dkt_csth nod 106 85 211
sel linersel id 5 ele dkt_csth nod 85 253 211
sel liner PROP iso=( 25e9, 0.15) thick=0.3 ; concrete
sel liner PROP cs_nk=8e8 cs_sk=8e8 &
cs_ncut=4e6 cs_scoh=4e6 cs_scohres=2e6 cs_sfric=20.0
这是复合地基中的基础连接，我不知道 nod 后面三个参数，是怎么出来了，谁能告诉我具体的求法，或给我一个例子，告诉我啊
谢谢，深感谢谢
