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- The rate of upward seepage taking place through a granular soil contained in a tank is 976.5 cm³/sec. Given that H1 = h = 1.8 m, the area of the tank = 0.62 m², void ratio of the soil = 0.55, the specific gravity is 2.65, and the hydraulic conductivity of the sand is 0.21 cm/sec, determine the following: a. The hydraulic gradient. b. Length of H2. c. The critical hydraulic gradient of the soil sample. d. If boiling will occur at h = 2.5 m? Justify your answer by showing the appropriate comparison by solving. e. The value ofh to cause boiling. (は) A H2 Valve (open) InflowThe rate of upward seepage taking place through a granular soil contained in a tank is 976.5 cm3/sec. Given that H1 = h = 1.8 m, the area of the tank = 0.62 m?, void ratio of the soil = 0.55, the specific gravity is 2.65, and the hydraulic conductivity of the sand is 0.21 cm/sec, determine the following: a. The hydraulic gradient. b. Length of H2. c. The critical hydraulic gradient of the soil sample. d. If boiling will occur at h = 2.5 m? Justify your answer by showing the appropriate comparison by solving. e. The value ofh to cause boiling. (あ)。 H, H1 H2 Valve (open) InflowA soil sample 10 cm in diameter is placed in a tube 1.2 m long. A constant supply of water is allowed to flow into one end of the soil at A and the outflow at B is collected by a beaker. The average amount of water collected is 2 cm3 for every 10 seconds. Determine the hydraulic gradient Determine the seepage velocity if the void ratio is 0.60 in cm/s. Determine the coefficient of permeability cm/s.
- 2. An aquifer has a hydraulic conductivity of 180 ft/day, and effective porosity of 33% and is under a hydraulic gradient of 0.0004. a) Compute the Darcy velocity (also called Darcy flux). b) Compute the actual velocity (also known as the average linear velocity). c) The water temperature was 14 Degree C, and the mean pore diameter was 0.30 mm. d) Was it permissible to use Darcy's law under these circumstances? e) What is the reason for your answer?Problem (5) A layered soil is shown in following figure. a) Estimate the hydraulic conductivity for flow in the vertical direction. b) Estimate the equivalent hydraulic conductivity for flow in horizontal direction. c) calculate the ratio of ky(eg) /kh(eq) 1 m k = 10-3 cm/sec 1 m k = 2 × 10-4 cm/sec 1 m k = 10 cm/sec 1 m k = 2 × 10¬³ cm/secProblem 2 Consider the stratified soil sample shown below with K₁ = 0.01 cm/sec, k₂ = 0.02 cm/sec, H₁ = 10 cm, and H₂ = 20 cm. 1. Determine the equivalent coefficient of hydraulic conductivity of the soil sample, keq 2. Determine the head at B (at soil 1/soil 2 interface), hs, given ha = 100 cm and hc = 0 direction of flow Question Quantity 1 2 Keq [cm/sec] hв [cm] A k₁ Answer 1 0.01 0 H₁ B Answer 2 0.015 20 K₂ C Answer 3 0.02 50 Answer 4 0.025 100
- Soil layers are shown as the right figure. Given: H₁ = 2 m, k₁ = 10-4 cm/sec H₂ = 3 m, K₂ = 3.2 x 10-² cm/sec H₂ = 4 m, K₂ = 4.1 x 10-5 cm/sec Estimate the ratio of horizontal equivalent hydraulic conductivity and vertical equivalent hydraulic conductivity, i.e., k./k₂ T * H₂ H₂ a. 152 Ob. 270 O c. 140 O d. 225 k₁ k₂ k3Question 2: * A soil sample 10 cm in diameter is placed In a tube 1 m long. A constant supply of water is allowed to flow into one end of the soil at A and the outflow at B is collected by a beaker. The average amount of water collected is 1 cubic centimeter every 10 seconds. The tube is inclined and has a head difference of 1.2 m. Determine the following o Hydraulic Gradient o Seepage velocity if porosity is 0.375 o Hydraulic conductivity Flow Rate Discharge VelocityPlease determine the hydraulic conductivity of soil sample. The length of soil is 200 cm, outflow rate is 10 cm3/s, the cross-sectional areas of tube, water tank, and soil column are 2 cm2, 200 cm2, and 25 cm2, respectively. The depth of water in the tank is 30 cm, the height of PC is 50 cm, the tilt angle of soil column is 30 degree. 30 degree
- Q.1. The figure below shows the flow net for seepage under a concrete dam. The is silty sand with coefficient of permeability of 4X104 cm/sec, a void ratio of 0.6 and specific gravity of 2.7. The height of water upstream is H=( 6+) (a) Determine the flow rate under the dam in m/day per m length of the dam. (b) Determine the water pressure distribution at the base of the dam. (Select 3 points under the base. Comment on your results. m (where X is your group number). (c) From (b), calculate the resultant uplift force and its location from the upstream face of the dam. Also, calculate the weight of the dam to prevent uplift using a factor of safety of 5. (d) What is the factor of safety against piping? Is the dam safe? (e) Calculate the total vertical overburden stress, pore water pressure and the effective vertical overburden stress at Points A and B. Comment on your results. H 17.5 m 1.25 m x B 4 m Impervious clay6. Given the following information and applying Darcy's Law for water flow through a 150 cm soil column, what is the approximate value for hydraulic conductivity? flux (Jw) = -10 cm/day I change in matric potential (AYm) = -100 cm 1 change in gravitational potential (AY) = 150 cm. %3D5. The coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/sec. Estimate the coefficient of permeability at a void ratio of 0.48. Using Casagandre equation Using Kozeny-Carman equation Find the difference in the rate of flow using the results of “a” and “b” if i = 0.70 and A = 0.6 m2.