9.4 An exploratory drill hole was made in a stiff saturated clay (see Figure 9.9). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 4 m above the top of the sand layer. If an open excavation is to be made in the clay, how deep can the excavation proceed before the bottom heaves? Exploratory deill hole G,-2.72 Moisture content w- 35% 6.1m 4 m wnted chu

9.4 An exploratory drill hole was made in a stiff saturated clay (see Figure 9.9). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 4 m above the top of the sand layer. If an open excavation is to be made in the clay, how deep can the excavation proceed before the bottom heaves? Exploratory deill hole G,-2.72 Moisture content w- 35% 6.1m 4 m wnted chu

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
gerotechnical engineering question
A standard penetration test is carried out in sand where the efficiency of the hammer nH =70%. If the measured N-value at 30 ft depth is 24, find N60 and (N1)60. The unit weight of the sand is 115.0 lb/ft3. Assume nB = nS = nR =1.
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
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geotechnical engineering question
The answer should be 9.56"
9.4 An exploratory drill hole was made in a stiff saturated clay (see Figure 9.9). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 4 m above the top of the sand layer. If an open excavation is to be made in the clay, how deep can the excavation proceed before the bottom heaves? Exploratory drill hole G₁=2.72 6.1 m Moisture content -35% m 4m £ Saturated clay Sand
Question 8 A gulf coast formation at 7,500 ft is drilled using 10.5 lb/gal mud. Total circulation pressure is 2500 psi; out of which 60% is lost across bit nozzles and the other 40% is lost equally between drilling string and annulus. Find formation pressure, fracture pressures, overburden pressure, and ECD. Is this a safe drilling operation?
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
Time left 1:24:08 An excavation is to be performed in a stratum of clay, 9 m thick, underlain by a bed of sand. In a trial bore hole, the ground-water is observed to rise up to an elevation 3 m below ground surface.Find the depth of which the excavation can be safely carried out without the bottom becoming unstable under uplift pressure of ground-water. The specific gravity of clay particles is 2.70 andthe void ratio is 0.70. If the excavation is to be safely carried to a depth of 7 m, how much should the water table be lowered in the vicinity of the trench ? O a. 6 m O b. 9 m C. O c. 10 m O d. 8 m SHOT ON POCO F3