Structural Elements in 3DEC

Cable Enhancements in 3DEC 5.2

An important aspect of geomechanical analysis and design is the use of structural support to stabilize a soil or rock mass. Cable elements in 3DEC may be assigned a tensile yield force limit and an axial rupture strain in order to simulate cable rupture. 3DEC can also simulate the shearing resistance along the cable length, as provided by the shear resistance bond between the grout and either the cable or the host rock. The cable is assumed to be divided into a number of segments with nodal points located at each segment end.

  • cables can now be used in dynamic simulations
  • force can now be applied to cable nodes
  • FISH scripting intrinsics have been added to access cable node, element, and property data
  • grout friction coefficient added so grout strength may depend on confining stress
  • FACEPLATE keyword connects the first node of the cable to the grid
  • improved plotting and querying

The following video shows the response of cable ground support around a tunnel. Although the material is excavated instantaneously to represent the tunnel void, the tunnel boundary is actually relaxed gradually to correctly simulate tunneling behavior.

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