Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 11, Problem 11.7P
To determine
Find the degree of consolidation caused by sand drain.
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The diagram of a sand drain is shown in Figures 16.21 and 16.22. Given: rw = 0.25 m, rs = 0.35 m, de = 4.5 m, Cv = Cvr = 0.3 m2/month, kh/ks = 2, and Hc = 9 m.Determine:a. The degree of consolidation for the clay layer caused only by the sand drains after six months of surcharge applicationb. The degree of consolidation for the clay layer that is caused by the combination of vertical drainage (drained on top and bottom) and radial drainage after six months of the application of surcharge. Assume that the surcharge is applied instantaneously.
A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. Provide a diagram
a.600 ml/s/meter length
b.300 ml/s/meter length
c.900 ml/s/meter length
d.1200 ml/s/meter length
Q#4 : For the concrete Dam shown in figure, determine the total average seepage for the given permeable strata by drawing Flow Net. The detail dimensions are given on the figure. The head of water on upstream side is 6ft and on downstream side is 1ft. Assume of Nf= 3, Nd= 6 and rectangular flow elements. Use MSpaint or graph paper
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Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Q#3 : For the concrete Dam shown in figure, determine the total average seepage for the given permeable strata by drawing Flow Net. The detail dimensions are given on the figure. The head of water on upstream side is 6ft and on downstream side is 1ft. Assume of Nf= 3, Nd= 6 and rectangular flow elements. Use paint or graph paperarrow_forwardA flow net for flow around a single row of sheet piles in a permeable soil layer is shown in the Figure below. Given that kx= kz = k= 5.5 x 10-3 cm/sec, H1 = 6.5 m and H2 = 2.3 m determine: i. How high (above the ground surface) the water will rise if piezometers are placed at points a and b ii. The total rate of seepage through the permeable layer per unit length iii. The approximate average hydraulic gradient at carrow_forwardA deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. a. 600 ml/s/meter length b. 300 ml/s/meter length c. 1200 ml/s/meter length d. 900 ml/s/meter lengtharrow_forward
- For the concrete Dam shown in figure, determine the total average seepage for the given permeable strata by drawing Flow Net. The detail dimensions are given on the figure. The head of water on upstream side is 6ft and on downstream side is 1ft. Assume of Nf= 3, Nd= 6 and rectangular flow elementsarrow_forwardSeepage takes place around a retaining wall shown in Figure Q5. The coefficient of permeability of the sand is 3×10−3 cm/s. If the retaining wall is 20m long, calculate the quantity of seepage across the entire wall per day.arrow_forwardAnswer the ff: a) What is the value of the hydraulic gradient b) The unit weight of the saturated soil layer is ? c) What is the rate and direction of seepage? d) The moisture content of the fully saturated soil layer is?arrow_forward
- A double wall sheet pile coffer dam retains a height of water 9 m on one side. A flow net constructed for this structure, driven into a pervious deposit overlain by an impervious ledge, consists of five flow channels and fifteen potential drops. The length of the coffer dam is 90 meters. If the coefficient of permeability of the pervious deposit is 10^–2 mm/s.Determine the seepage in cubic meters per day.arrow_forwardA double drain consolidation test was performed on a sample of marine clay. The thickness of the clay layer is 50mm and the hydraulic conductivity during the test was 1,753x10-8 m/min. During the test the following data were determined. σ '1= 300 KN/m2 e= 0.42 σ '2= 500 KN/m2 e=0.30 Determine: The time to reach 75% consolidation The excess water pressure value after 50 min of starting the test at 10 mm deptharrow_forwardA double wall sheet pile coffer dam retains a height of water 9 m on one side. A flow net constructed for this structure, driven into a pervious deposit overlain by an impervious ledge, consists of five flow channels and fifteen potential drops. The length of the coffer dam is 90 metres.If the coefficient of permeability of the pervious deposit is 10^–2 mm/s determine the seepage in cubic metres per day. a. 621.4 m^3/s b. 946.5 m^3/s c. 101.0 m^3/s d. 233.3 m^3/sarrow_forward
- The specific gravity of the ground soil of an earth dam is Gs=2.58, the void ratio e=0.84, and the hydraulic gradient i e at the downstream seepage outlet is 0.22. If the safety factor Fs is 2.2, then ask whether there will be the damage of soil flow at the outlet of the earth dam?arrow_forwardGiven: rw = 0.25 m, rs = 0.35 m, de =4.5 m, cv 5 cvr = 0.3 m2/month, kh/ks 5 2, and Hc = 9 m. Determine: The degree of consolidation for the clay layer causedonly by the sand drains after six months of surchargeapplicationarrow_forwardA 10 m clay layer is sandwiched between two sand layers and subjected to a uniformly distributed load of 100 kPa. If the coefficient of consolidation is 0.005 cm2 /s. length of the drainage path is 5m. What will be the time required for 50% consolidation?arrow_forward
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