Question

Chapter1 in Stu Stresses 326 Layer 2 Layer s n, 2i Figure 9.25 Thicknes Layer so. Problen H, -7ft 9.1 у,-110 Mt, H-12 H,6f H,-5m -121 Jbvt e-07: G.-259 9.2 -8m e-0.55;G,-27 -3m H-6m H, 25m 9.3 -16kN/m 9.4 Consider the soil protile in Problem 9.2. What is the change in etlective stress at point C if a. the water table drops by 2 m? h. the water table rises to the surface up to point A? e. the water level rises 3 m above point A due to flooding? 9.5 Consider the soil protile shown in Figure 9.26 a. Calculate the variations ofo, u, and σ' at points A, B, and C. b. How high should the groundwater table rise so that the effective stress at Cis 111 kN/m ? Page 3 of 5

Answer 1

rm p. e, 2-1-2 eY 2 3 For e - 2 69 9. 81 1+e 2.69 0 70 lt e の(dat) sana 562 /m3

吖 2:t 0.55 1 +0 55 Sah sana Fo 3 LAS (t+ I2) (a) when ater able dr ops by 2m EHec.rt ve stress before dropo)-pointー C : Effective srress after dro 23,

whem water rule rises o arouna surtace Ans When water able rises 3m above nYound. e in watene. a ove arounå suT eHechive stress. dio nor cause any cha nge m In this case Pns 1.5 Fique 9.26 is no pr ovideå. Wen ce could n solwe this roblem.