For the conditions show below, calculate the safety factor of the clay against bottom blow-up after excavating 2 m of clay based on the ratio of total pressure and pwp pressure. ] Before excavation 21 I GWT V Silty clay Gs = 2.7 w = 30% k = 3 x 10 m/s 2 m 2 m 6 m Gravel Under artesian pressure

For the conditions show below, calculate the safety factor of the clay against bottom blow-up after excavating 2 m of clay based on the ratio of total pressure and pwp pressure. ] Before excavation 21 I GWT V Silty clay Gs = 2.7 w = 30% k = 3 x 10 m/s 2 m 2 m 6 m Gravel Under artesian pressure

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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The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL= 20 and the in situ moisture content is 45%. Determine the plasticity index. a.22 b.17 c.27 d.12
The result of the liquid limit tests where N is the no of blows and w is the water content in % are given as follows: Trial 1 N=11 w=53.9; Trial 2 N=15 w=50.6; Trial 3 N=23 w=48.1; Trial 4 N= 30 w= 46; Trial 5 N= 46 w=43.3; Trial 6 N= 53 w=41. The PL=25 and the in situ moisture content is 45%. Determine the liquid limit. O a. 41 O b. 47 O c. 43 O d. 50
A storage tank of diameter of 30 m and gross (total)weight 105 kN is to be constructed on site shown below. To construct the tank 5 m of the dense sand layer will be excavated and the tank will be built as shown .a) Calculate the increase in stress in the clay layer under the center of the tank . b) Calcuate the final consolidation settlement due to the tank. C) how much settlement that would be expected to occure 1 year, 5 years and 20 years after the tank is completed. d)- Assume that the silty clay were originally overconsolidated (OCR=1.4), how would be the ultimate consolidations settlements be different? Given c 0.03 %3D Dense Sand, G,-2.80; e=0.55 10m 0.95 Saturated nomially consolidated silty clay C43 10" m day 20 m G267: Drained permicable sandstone
Answer the following questions: a- What is pre-consolidation pressure? Plot the consolidation curve and show it. b- In which region of the optimum water content of a dam clay core is desired to be, explain why.
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An exploratory drill hole was made in a stiff saturated clay having a moisture content of 29% and G, = 2.68 (Figure 9.27). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 6 m above the top of the sand layer. a. If an open excavation is to be made in the clay, determine the safe depth of excavation before the bottom heaves. b. How much is the pressure at the interface of the clay and sand? c. If a factor of safety of 2.0 is to be ensured, how deep should be the excavation from the ground surface?
Refer to Figure 2, estimate the primary consolidation settlement in the clay layer. Given: Ag = 85 kN/m²; Hi = 2 m; H2 = 4 m; and H3= 6 m. Soil characteristics are as follows: Sand: ydx 14 kN/m³, Ysat 18 kN/m³ Clay: LL = 54; e = 0.98; Ysat 19 kN/m'; Cs =- Cc 150 kN/m? H3 Sand Clay ョ→
Known: B = 1m, L = 2m, Q = 100kN Estimate the consolidation settlement and How long will it take to reach 90% consolidation?
Estimate the total consolidation settlement (primary & secondary) after 2 years and 3 months after the completion of primary consolidation settlement of an over consolidated clay layer under the bridge pier as shown below. The pier's dimensions are (2 m x 3 m). Use Yw= 10 kN/m³ and note that the time for completion the primary consolidation is 3 years. | Qo= 960 kN G.W.L 1m Sand Ya=16.5 kN/m 2 m Ysat = 18 kN/m³ Silty Sand Ya=17.5 kN/m 3 m Ysat = 18.5 kN/m3 Clay Ya=20 kN/m , Ysat = 21 kN/m3 e, = 0.6 , Ae=0.04 , o= 78.3 kN/m2 4 m Cc= 0.4, Cs= 0.1, Ca= 0.02
A large oil storage tank 90 meters in diameter is to be constructed on the soil profile shown in the figure below. The average depth of the oil in the tank is 18 meters, and the specific gravity of the oil is 0.92. Consolidation test showed that the clay is normally consolidated with Ccε = 0.154, Crε = 0.0112, and σ'p = 260 kPa. Estimate the total consolidation settlement of the tank. Neglect any settlements in the sand (ρd,sand = 1.71 Mg / m3). Perform this estimation by: a. Assuming conditions at the mid-depth of the clay are typical of the entire clay layer. b. Dividing the clay layer into four thinner layers with a thickness of 5 meters each, computing the settlement of each thin layer, and summing up using the included equation for sc. Assume that σ'p = σ'vo when σ'vo > σ'p. Hint: the load applied by the tank is given by qo = ϒoilhoil
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