Dry sand y = 16.5 kN/m³ 1.5 m Groundwater table Sand 1.5 m Ysat = 19 kN/m3 N60 :1.5 m Clay Ysat = 16.8 kN/m3 1.5 m * A•8 1.5 m 1.5 m 10 Sand Figure P3.2 Си 0.29N72 Ра (3.8) where pa = atmospheric pressure ( 100 kN/m?; - 2000 lb/in²). The overconsolidation ratio, OCR, of a natural clay deposit can also be correlated with the standard penetration number. On the basis of the regression analysis of 110 data points, Mayne and Kemper (1988) obtained the relationship N60 OCR = 0.193 0.689 (3.9) where o, = effective vertical stress in MN/m?.

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7.14 For a normally consolidated clay, the following values are given: Void ratio, e k (cm/sec) 0.95 0.2 x 10-6 0.91 x 10-6 1.6 Estimate k at a void ratio of 1.1. Use Eq. (7.38). Ⓒ Cengage Learning 2014

A Sample of Clay is isotropically normally consolidated to a cell pressure of 350kPa. The sample was then sheared (standard) in a drained state. Calculate values of q, p', and v at failure if the soil constants were: M=0.88, N=2.88, I-2.76, and 2-0.16