The soil is defined by a number of borings. Each one has multi-layers with different soil materials, Figure 57. Variable thickness and discontinuous soil strata can be considered, Figure 60. Loading and reloading of the soil modulus can be taken into account by the analysis, Figure 61. It is possible to draw soil layers by different symbols according to the German Standard DIN 4023 for easy identification. Also, the limit depth of soil layers can be determined. Variable foundation levels can be considered in the analysis (Figure 60).
Three different methods are used to determine the flexibility coefficients or the modulus of subgrade reaction:
  1. Interpolation method (Figure 57)
  2. Subareas method (Figure 58)
  3. Hand-Division of boring logs to nodes (Figure 59)