Goal
- Determination of settlements, tangential inclinations and curvatures on the surface during tunnel driving
- Assessment of the damage potential
Procedure: Mathematical description of the settlement trough
Unknown variables are:
- volume loss Vls
- Turning point distance i and iy in transverse and longitudinal direction
Proceed as follows:
- Evaluation of the measurements of more than 350 settlement troughs
- Consideration of a probability of occurrence
- 2D and 3D FE calculations to transfer empirical information to other conditions
Results
Formulas for determining Vls and i as a function of:
- the tunnelling method
- the tunneling depth
- the soil stiffness
- the geological situation
- the breakout cross section
- the probability of exceeding the limit
And therefor:
Assessment of the risk of building damage to conventional buildings, e.g. according to Kramer 1974 or Burland 1995.