In-Situ Stress And Topography in 3DEC

3DEC is commonly used to model rock masses close to the earth’s surface. In these situations, the in-situ vertical stress at each point can be calculated from the weight of overlying material. The horizontal stresses often are assumed to be some proportion of the vertical.

3DEC provides a command, insitu topo, to calculate these initial stresses for each zone. However, this calculation used to be so slow that is was not of practical use. With the latest update of 3DEC (Version 5.00.168 or above), this function has been sped up dramatically to make it useful once again.

The figure below shows vertical stress calculated using the insitu topo command for a model with almost 800,000 zones. The calculation takes a couple of minutes, depending on the speed of your computer. You can see the higher stresses under the mountains and the lower stresses under the valleys. The red circle indicates a geological unit with low density. The zones under this unit therefore have reduced stresses.

The insitu topo command also calculates the stresses on joints as shown in the figure.

Download example


Latest News
  • Itasca Software now Available for Linux Version 7 or greater of Itasca software (FLAC3D, 3DEC, PFC3D, and PFC2D) are now operable...
    Read More
  • Model Plot Contest Winners Itasca is pleased to announce the winners and honorary mentions of our Model Plot Contest...
    Read More
  • Meet Itasca France at AFTES 2021 in Paris! Itasca Consultants will be present at the next AFTES Congress entitled "The underground, a space...
    Read More

Upcoming Events
7 Mar
FLAC Online, Live Introductory Training
... Read More
21 Mar
FLAC3D 2021 Online, Live Introductory Training: COURSE IS FULL
Three days of general feature training addressing basic concepts and recommended procedures for geotechnical numerical analysis.... Read More
4 Apr
PFC 2022 Online, Live Introductory Training
PFC 2021 Online, Live Introductory Training... Read More