326 Chapter 9 In Situ Stresses Dry sand e = 0.61 G, =2.66 4 m H1 Layer 1 Groundwater table Saturated sand Н> Layer 2 e= 0.48 G,= 2.67 Clay Нз Lver 3 Figure 9.26 9.6 For a sandy soil with G, = 2.68, calculate will cause boiling or quick condition for e variation of i with the void ratio. 9.7 An exploratory drill hole was made in as content of 29% and G. = 2.68 (Figure 9.27 was observed to be under artesian pressu. height of 6 m above the top of the sand layer in the clay, determine the safe depth of exca %3D Dry sand Sand Clay Rock Figure 9.25 %3D Problem Layer no. Thickness Soil parameters 9.1 H = 7 ft Ya = 110 lb/ft³ H, = 12 ft %3D Ysat = 121 lb/ft 3 H = 6 ft 118 lb/ft³ Ysat %3| 9.2 H = 5 m e = 0.7; G, = 2.69 H, = 8 m e = 0.55; G. = 2.7 3 H, = 3 m w = 38%;e = 1.2 10 m 9.3 %3D Н, — 3 m 6 m Ya = 16 kN/m³ H, = 6 m Ysat = 18 kN/m³ 3 — 2.5 m = 17 kN/m3 %3D Ysat 9.4 Consider the soil profile in Problem 9.2. What is the change in effective stress 4.5 m at point C if: a. the water table drops by 2 m? b. the water table rises to the surface up to point A? c. the water level rises 3 m above point A due to flooding? 9.5 Consider the soil profile shown in Figure 9.26: a. Calculate the variations of o, u, and o' at points A, B, and C. Saturated clay Figure 9.27 A 10-m-thick layer of stiff saturated clay is under The sand is under artesian pressure.A 5.75- Determine the factor of safety against heavin b. How high should the groundwater table rise so that the effective stress at 9.8 C is 111 kN/m2?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Transcribed Image Text:326 Chapter 9 In Situ Stresses Dry sand e = 0.61 G, =2.66 4 m H1 Layer 1 Groundwater table Saturated sand Н> Layer 2 e= 0.48 G,= 2.67 Clay Нз Lver 3 Figure 9.26 9.6 For a sandy soil with G, = 2.68, calculate will cause boiling or quick condition for e variation of i with the void ratio. 9.7 An exploratory drill hole was made in as content of 29% and G. = 2.68 (Figure 9.27 was observed to be under artesian pressu. height of 6 m above the top of the sand layer in the clay, determine the safe depth of exca %3D Dry sand Sand Clay Rock Figure 9.25 %3D Problem Layer no. Thickness Soil parameters 9.1 H = 7 ft Ya = 110 lb/ft³ H, = 12 ft %3D Ysat = 121 lb/ft 3 H = 6 ft 118 lb/ft³ Ysat %3| 9.2 H = 5 m e = 0.7; G, = 2.69 H, = 8 m e = 0.55; G. = 2.7 3 H, = 3 m w = 38%;e = 1.2 10 m 9.3 %3D Н, — 3 m 6 m Ya = 16 kN/m³ H, = 6 m Ysat = 18 kN/m³ 3 — 2.5 m = 17 kN/m3 %3D Ysat 9.4 Consider the soil profile in Problem 9.2. What is the change in effective stress 4.5 m at point C if: a. the water table drops by 2 m? b. the water table rises to the surface up to point A? c. the water level rises 3 m above point A due to flooding? 9.5 Consider the soil profile shown in Figure 9.26: a. Calculate the variations of o, u, and o' at points A, B, and C. Saturated clay Figure 9.27 A 10-m-thick layer of stiff saturated clay is under The sand is under artesian pressure.A 5.75- Determine the factor of safety against heavin b. How high should the groundwater table rise so that the effective stress at 9.8 C is 111 kN/m2?

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