9.1 Refer to Figure 9.1, where a 2.0 m x 3.0 m flexible founda- tion is placed in a saturated clay at 1.5 m depth. Bedrock lies at 4.0 m below the foundation. The clay is overconsolidated with OCR = 2, undrained shear strength 60 kN/m², and plasticity index = 45. If the pressure applied by the founda- tion to the underlying soil is 80.0 kN/m², determine the aver- age elastic settlement. = SETTLEMENT OF SHALLOW FOUNDATIONS 2.0 1.5 A 1.0 0.5 LIB- L/B-10 Square Circle 0 0.1 1 10 100 1000 H/B 1.0 A₂ 0.9 0.8 0 5 10 15 20 D₁/B FIGURE 9.1 Values of A, and A, for elastic settlement calculation-Eq. (9.1) (Based on Christian, J. T. and Carrier, W. D. (1978). "Janbu, Bjerrum and Kjaernsli's chart reinterpreted." Canadian Geotechnical Journal, Vol. 15. pp. 123–128) The modulus of elasticity (E,) for saturated clays under undrained conditions can, in general, be given as where c, undrained shear strength. E₁ = ẞc (9.2) The parameter ẞ is primarily a function of the plasticity index and overconsoli dation ratio (OCR). Table 9.1 provides a general range for ẞ based on that proposed