The Field Stress option allows the user to define the in-situ field stress conditions prior to excavation. Two options are available for defining field stress in RS2 - Constant or Gravity field stress. Read more about each of the field stress options below: :
The Use Actual Ground Surface option is very useful for surface excavations such as open pit mines, slopes, rock cuts etc. This method provides a better initial estimate of the vertical in-situ stress, for surface excavations where the ground surface is irregular (i.e. not defined by a single horizontal surface).
For example, individual layers of material in bedded geological structures will sometimes have an in-situ stress that is different from the stress in surrounding layers. When this situation occurs, the user can define a customized field stress for any material(s) in their model.
- If you are using Field Stress = Constant, then by default the Initial Element Loading for all materials will be Field Stress Only
- If you are using Field Stress = Gravity, then by default the Initial Element Loading for all materials will be Field Stress & Body Force
- You may also specify Initial Element Loading = Body Force Only (eg. for backfill materials). Or you may specify Initial Element Loading = None (no initial stress or force on the elements)