3. A wide rectangular sandy channel bed with slope of 0.0002 carries suspended particles with mean Ds = 0.11 mm, and s = 2.65 g/cm3 . The average flow depth of the channel is 2 m. The kinematic viscosity of water is 6 2  1.2 10 m /s − =  . Determined the relative concentration of suspended load C/Ca at the water depth of 1 m above the channel bottom. Assume the roughness length a is neglig

3. A wide rectangular sandy channel bed with slope of 0.0002 carries suspended particles with mean Ds = 0.11 mm, and s = 2.65 g/cm3 . The average flow depth of the channel is 2 m. The kinematic viscosity of water is 6 2  1.2 10 m /s − =  . Determined the relative concentration of suspended load C/Ca at the water depth of 1 m above the channel bottom. Assume the roughness length a is neglig

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.13P

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1. (30 pts) The soil profile shown below consists of 10 meters of sandy silt overlying gravel. The pore water pressure at the top surface of the silty sand is zero and can be assumed to remain zero. a) Calculate the level to which water would rise in a piezometer tube inserted into the top of the gravel if the silty sand is just stable? Use submerged unit weights and seepage forces to arrive at your answer (do not calculate total stresses and pore water pressures). Express your answer as an elevation, e.g. "Elev. 130". (Note: Elevations are in meters) (10 pts) b) Using the piezometric elevation calculated in part (a), calculate the pore water pressure at the bottom of the silty sand if the silty sand is just stable (10 pts). c) Calculate the total stress at the base of the silty sand and show that it is equal to the pore water pressure calculated in part (b) (10 pts) Elev. 120 m. Elev. 110 m. Sandy Silt (saturated) Void ratio, e = 0.68 G = 2.65 Gravel
Assume a=2d, and plot the dimensionless concentration profiles C/C, for sediments with 0.016 mm, 0.125 mm, 0.5 mm in a 3 m deep very wide channel with slope of S=0.002.
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3
A glass container with pervious bottom containing fine sand in loose state (void ratio = 0.8) is subjected to hydrostatic pressure from underneath until quick condition occurs in the sand. If the specific gravity of sand particles = 2.65, area of cross-section of sand sample= 10 cm2 and height of sample = 10 cm, compute the seepage force in N acting from below. a. 9.17. b. 0.9 c. 0.45 d 7.29
سويل In the figure below if h,=3 m: h2=2.8 m; q=500 kN/m? 9- KN/m? (net stress increase) AVAVAV Sand y= 15.7 kN/m 1.5 m Groundwater Table BxL= 1.5 m x 3.0 m him Sand Yat= 16.5 kN/m Clay Yaa= 16 kN/m e, = 0.68 C. = 0.25 C, = 0.06 h2 Please fill in the blank with only one digit and no units like this 123.4 A) if the drainage in the clay layer is single drainage, resulted in 90% primary consolidation in 120 days. Find the coefficient of consolidation in cm/day. 554.0 B) If c, =621 cm/day, and the tool settlement is 30 cm, How long (in days) will it take for the clay layer in the field to reach 11 cm consolidation? 13.3 •.. المزيد
i) A pipe of 1.2 m diameter was provided in a reservoir to act as an outlet. Due to disuse, it was buried and completely clogged up for some length by sediment. Measurements indicated the presence of fine sand (coefficient of permeability, K, = 10 m/day) deposit for a length of 100 m, at the upstream end and of coarse sand (coefficient of permeability, K₂ = 50 m/day) at the downstream end for a length of 50 m. In between these two layers the presence of silty sand (coefficient of permeability, K3 0.10 m/day) for some length is identified. For a head difference of 20 m on either side of the clogged length, the seepage discharge is found to be 0.8 m³/day. Estimate the length of the pipe filled up by silty sand. =
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4. Is Turbulent Flow Possible? Water flows through sand with an average particle size of 0.70 mm. Assume that the average water temperature in the subsurface is 15 C. What is the maximum velocity of laminar flow through this material? What gradient is required to produce such a velocity assuming the sand's hydraulic conductivity is approximately 102 cm/s? Is that gradient physically possible under natural conditions? please solve with correct solution
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