3: A preliminary design of a reservoir is shown in Figure. Draw the flow-net. Calculate the flow rate. How much water will flow in a day from the upstream to the downstream side. Calculate the porewater pressure at A.
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P3: A preliminary design of a reservoir is shown in
Figure.
Draw the flow-net.
Calculate the flow rate.
How much water will flow in a day from the upstream to the downstream side.
Calculate the porewater pressure at A.
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- The length of the levee perpendicular to the paper is 600 m; the sand on top and bottom have k1=750 ft/day and k2= 40 in/s respectively. The thickness of sands is equal, m = 670 m, n=575 ft, B = 8ft, C = 525 ft. Determine the amount of water flowing to the ditch in in3/min. (See picture below)kN 150mm 300mm Alw. O'ampressive = 5 MPa Peampressile= 5 MPaA DrahmedsoilMechanicsnoteschapters pdf Downloads/DrahmedsoilMechanicsnoteschapter5.pdf 5.16 Refer to Figure in which upward seepage is taking place through a granular soil contained in a tank. Given: H1 = 1.5 m; H2 = 2.5 m; h = 1.5 m; area of the tank = 0.62 m?: void ratio of the soil, e = 0.49: G. = 2.66; and hydraulic conductivity of the sand (k) = 0.21 cm/sec. a. What is the rate of upward Valve fopen) seepage? b. Will boiling occur when h =1.5 m? Explain. c. What would be the critical value of h to cause boiling? Inflow Ans.: (a) q = 781.2 cm'isec, (b) No. (c) h = 2.77m 5.17 Refer to Figure of Problem 5.16. If H, = 0.91 m, H2 = 1.37 m. h =0.46 m, Ysat = 18.67 kN/m, area of the tank = 0.58 m2, and hydraulic conductivity of the sand (k) = 0.16 cm/sec, a. What is the rate of upward seepage of water (m/min)? b. If the point C is located at the middle of the soil layer, then what is the effective stress at C? Ans.: (a) i= 0.336, (b) q = 0.0187 m/min 5.18 A cut is made in a stiff,…
- Hydraulic gradient = 0.75 Lenght of H2 = 2.4m Critical hydraulic gradient Icr= 1.064Q.5) The section through a long cofferdam is shown below, the coefficient of permeability of the soil being 6x10-8 m/s. Determine the quantity of seepage entering the cofferdam. A T 5.50 m I 0 1 2 3 4 5 As = 0.70 ml +cl O. 10 4 B D 15 mFor the old building, the water table was 2m below the ground surface, if the water table lowered under the clay layer, find the consolidation Settlement- WT P=200kv/m² loxlom sat = 20 kN/m³ CC=0.25 e=0.7 clay 8=19KN/m³ 12m 4m 2m
- A retaining wall is to be constructed to retain an embankment on a construction site.The wall is 70m long and 5.45 m high The wall has a thickness of 40cm at base and 30cm on top. The batching of the is as follows + Lean concrete 250g/m3 of 400l/m3 of sand, and 800l/m3 of gravel + Reinforced concrete 350k/m3 of cement, 0.22tonne/m3 of rods, 400l /m3 of sand, 800L/m3 of gravel. Consider waste in materials as supplied on site to be as follows: cement =2% sand =3% gravel 3% rods =2% . The prices below are those of materials supplied on site . Cement=100000frs/tonne, transportation=10000frs/tonne, and handling is 4000frs/tonn. Sand 16000frs/m3, transportation 2000frs/m3 . Gravel =36, 000frs/m3, transportation transportation 2000frs Rods=1, 200,000frs/tonne, transportation=10, 000frs/tonne and handling=6000frs/tonne. Execution time -lean concrete=0.50hr/m3 -Reinforced concrete wall+footing=2hrs/m3 -Formwork placing/striking=0.75hr/m3 -Reinforcement=0.75hr/tonne To completely…El. 140m 40. A sand layer having the cross section area as shown has been determined to exist for 350m length of levee with a base of 110m. The coefficient of permeability of the sand layer is 3.5m/day. Determine the flow of water into the ditch in Lit/min? Levee El. 120m base = 110m a. 232 b. 254 Sand Layer, 1.5m thick C. 287 d. 211 Impervious LayerQA 5m deep deposit of silty sand lies above a 4m deep deposit of The Uneler- gravel. gravel is lain by a deep layer of stiff clay. The ground water table is found 2m. below the ground sur lace. The Soil Properties are:- of Bal Sand below GWT = 1.75 Mg 1 m³ Pat Isat of gravel = 2.05 Mg/m³ sat of sand above G.WT = 1.7 Mg/m³ Draw The distribution of vertical total stress, Pore water pressure, and vertical effective stress with depth down to the clay layer. 0 = 8xh 8 = 1.7 Mg/m³ Sat St But = 1.95 Mg/m³ = 2.05 Mg/m³ D GWT silty sand G.L gravel clay H 5⁰m
- 1. Determine the following: If w₁=5 kN/m and w₂ = 7 kN/m, Est= 210 GPa, b = 50 mm and h= 150 mm. (BY AREA-MOMEMNT METHOD) O 1.0A = 2. to 3. SB = Wi A 8 m B - 4 m C in in W23-A water tank diameter ard 1am high. if the tark is to be is 10m in completely filled, det. the mini mun thickness 4 the tamk plating if the SHress is imited to ya mPa, Twater density wayer,=027 ncomect Consider the soil system shown below. 1m Water Fine 4m sand k 2 x 10 mm Coarse silt 4m k = 4 x 10 mm/s Fine 4m silt k 2 x 10 mm/s Datum Beneath the fine silt layer there is stratum of water-bearing gravel with a water pressure of 155 kPa. The surface of the sand is flooded with water to a depth of 1m. The excess hydrostatic head at the fine sand/coarse silt interface is cm. Your Answer 32 15 17