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SeepageSolid

침투 요소(Seepage solid element)는 지반내 공극에 지하수의 흐름에 대한 침투해석에 사용되는 요소이다. 이때 공극내 물은 Dary’s law와 연속방정식을 만족한다. 따라서 침투해석(*Step, TYPE=Seepage)에만 유효하다. 관련된 요소, 단면, 재로, 경계조건은 다음과 같다.

Seepage solid element

  • SC2D3 : 2차원 삼각 trianglular
  • SC2D4 : 2차원 4절점 quadrilateral
  • SC3D4 : 3차원 4절점 tetrahedron
  • SC3D6 : 3차원 6절점 prism
  • SC3D8 : 3차원 8절점 hexahedron

Load

  • Concentric : concentric flux를 절점에 작용시킴(자유도 P)
  • Displacement : 0이 아닌 pressure 조건(자유도 P). 또는 total head(자유도 H)를 지정
  • SurfaceDistributed : flux를 요소 표면에 작용시킴.

Constraint

  • Support : pressure를 0인 조건.

Section

  • Solid : 연결하는 재료는 seepage 재료(*Material, Type=Seepage)를 사용해야 함

Material

  • Seeapage : 투수계수, SWCC등 침투해석용 재료 물성치

*Element, TYPE=SC2D3

*Element, Type=SC2D3, ELSet=elset
 id, n1, n2, n3{, S=section }
 ...
Specifications
  • No. of nodes : 3
  • No. of integration pts. : 1
  • Fields : Material model at each Gauss points
  • Compatible section : SolidSection with Seepage Material
  • Active DOFs : P

*Element, TYPE=SC2D4

*Element, Type=SC2D4, ELSet=elset
 id n1 n2 n3 n4{, S=section}
 ...
Specifications
  • No. of nodes: 4
  • No. of integration pts.: 2-by-2
  • Fields: Material model at each Gauss points
  • Compatible section : SolidSection with Seepage Material
  • Active DOFs: P

*Element, TYPE=SC3D4

*Element, Type=SC3D4, ELSet=elset
 id n1 n2 n3 n4 {, S=section}
 ...
Specifications
  • No. of nodes : 4
  • No. of integration pts. : 1
  • Fields : Material model at each Gauss points
  • Compatible section : SolidSection with Seepage Material
  • Active DOFs : P

*Element, TYPE=SC3D6

*Element, Type=SC3D6, ELSet=elset
 id n1 n2 n3 n4 n5 n6{, S=section}
 ...
Specifications
  • No. of nodes : 6
  • No. of integration pts. : 2
  • Fields : Material model at each Gauss points
  • Compatible section : SolidSection with Seepage Material
  • Active DOFs : P

*Element, TYPE=SC3D8

*Element, Type=SC3D8, ELSet=elset
 id n1 n2 n3 n4 n5 n6 n7 n8{, S=section}
 ...
Specifications
  • No. of nodes : 8
  • No. of integration pts. : 2-by-2-by-2
  • Fields : Material model at each Gauss points
  • Compatible section : SolidSection with Seepage Material
  • Active DOFs : P