关于ABAQUS中SOIL的问题

yuechenling

各位大虾不知有没有看过ABAQUS帮助文档中关于SOIL的例题，这是第二个例题，有关dam的，有几点不明白想请各位大虾指点一二。
*HEADING
EARTH DAM
STEADY STATE FREE SURFACE SEEPAGE      
*** UNITS: M, KG, SEC, NEWTON
*NODE,NSET=ALLN
1,0.,0.
39,4.8768,0.
601,1.8288,1.8288
639,3.048,1.8288
*NGEN,NSET=BOT
1,39,1
*NGEN,NSET=TOP
601,639,1
*NFILL,NSET=ALLN
BOT,TOP,12,50
*NSET,NSET=PORN0,GENERATE
1,39,2
*NSET,NSET=PORN1,GENERATE
101,139,2
*NSET,NSET=PORN2,GENERATE
201,239,2
*NSET,NSET=PORN3,GENERATE
301,339,2
*NSET,NSET=PORN4,GENERATE
401,439,2
*NSET,NSET=PORN5,GENERATE
501,539,2
*NSET,NSET=PORN6,GENERATE
601,639,2
*NSET,NSET=PORN
PORN0, PORN1, PORN2, PORN3
*NSET,NSET=OUTN,GENERATE
1,601,100
21,621,100
*ELEMENT,TYPE=CPE8RP,ELSET=DAM
1,1,3,103,101,2,53,102,51
*ELGEN,ELSET=DAM
1,19,2,1,6,100,20
*ELSET,ELSET=FSIDE,GENERATE
19,119,20
*ELSET,ELSET=FBOT,GENERATE
16,19
*ELSET,ELSET=OUTE,GENERATE
11,111,20
*SOLID SECTION,ELSET=DAM,MATERIAL=FILL
*MATERIAL,NAME=FILL
*ELASTIC
1000.,
*DENSITY
2000.,
*PERMEABILITY,SPECIFIC=10000.
2.1167E-4,
*SORPTION
-100000.,.04
-10000.,.05
0.,1.
*INITIAL CONDITIONS,TYPE=SATURATION
ALLN,1.
*INITIAL CONDITIONS,TYPE=PORE PRESSURE
PORN, 12192.0, 0.0, 0.0, 1.2192
PORN4,0.
PORN5,0.
PORN6,0.
*INITIAL CONDITIONS,TYPE=RATIO
ALLN,1.
*BOUNDARY
ALLN,1
ALLN,2
*RESTART,WRITE,FREQUENCY=10
*STEP,INC=5
*SOILS
.2,1.
*DLOAD
DAM,GRAV,10.,0.,-1.,0.
*BOUNDARY
1,8,,12192.
101,8,,9144.
201,8,,6096.
301,8,,3048.
401,8,,0.
*FLOW
FSIDE,Q2D,0.1
FBOT,Q1D,0.1
*CONTROLS,ANALYSIS=DISCONTINUOUS
*NODE PRINT,FREQUENCY=10,NSET=OUTN
POR,
*EL PRINT,FREQUENCY=10,ELSET=OUTE
SAT,POR
*NODE FILE,FREQUENCY=10,NSET=OUTN
POR,
*OUTPUT,FIELD,FREQ=10
*NODE OUTPUT,NSET=OUTN
POR,
*EL FILE,FREQUENCY=10,ELSET=OUTE
SAT,POR
*OUTPUT,FIELD,FREQ=10
*ELEMENT OUTPUT,ELSET=OUTE
SAT,POR
*END STEP
其中有几下几点不明白
1、*SORPTION
     -100000.,.04
       -10000.,.05
       0.,1.
2、*INITIAL CONDITIONS,TYPE=SATURATION
     ALLN,1.
3、*STEP,INC=5
     *SOILS
     .2,1.
4、*FLOW
     FSIDE,Q2D,0.1
     FBOT,Q1D,0.1
5、*CONTROLS,ANALYSIS=DISCONTINUOUS
其中1、3、4的取值有何规律或者公式可依据？起何作用，特别是3，步长的取值有何规律？其中2为何把整个坝体的饱和度初始值都定为1？5在什么情况下需要使用？

各位大虾看了我的问题估计就知道我是菜鸟，不敢奢望能一一解答，只希望能指点一二，谢谢！