Q.1 What are the positive or negative consequences of building an earthfill dam with an inclined core instead of a vertical core? I need correct answer in 20 minutes please with me best wishes Ahmed
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- A gravity dam section of 130 feet total height contains water upto 118 feet on its upstream side and islocated in seismic zone where horizontal and vertical earthquake accelerations are 0.15g and 0.1grespectively. If earthquake duration is 1.2 seconds then how much hydrodynamic force will be developedand where will it act on the dam? In which direction, will you consider this force in stability analysis of thedam?a. Which of the following most nearly gives the factor of safety against sliding? b. Which of the following most nearly gives the factor of safety against overturning? c. Which of the following most nearly gives the pressure intensity at the heel of the dam?A masonry dam of trapezoidal cross section, with one face vertical, has a thickness of 2 ft at the top and 10 ft at the bottom. It is 22 ft high and has a horizontal base. The inclined face is subjected to water pressure, the water standing to a depth of 15 ft above the base. The weight of the masonry is 150 1b per cu ft. If there is no hydrostatic uplift, where will the resultant pressure intersect the base? Is this a good design?
- varies uniformly from full Hyu between dam and foundation soil is 0.40. Which of the following most nearly gives the factor of safety against slidling? 12 m A. 1.22 1 m 5m A. 2.56 4m 9m A. 154.52 kPa 4m 2 m 8m 3m B. 1.56 7.) A concrete dam retaining water is shown in the figure. The specific weight of concrete is 24 kN/m3. Assume hydrostatic uplift varies uniformly from full hydrostatic pressure at the heel of the dam to zero at the toe and that the coefficient of friction between dam and foundation soil is 0.40. Determine the factor of safety against overturning. C. 2.31 B. 315.61 kPa C. 2.12 B. 1.89 8.) A concrete dam retaining water is shown in the figure. The specific weight of concrete is 24 kN/m3. Assume hydrostatic uplift varies uniformly from full hydrostatic pressure at the heel of the dam to zero at the toe and that the coefficient of friction between dam and foundation soil is 0.40. Determine the maximum pressure on the foundation. D. 1.89 C. 281.63 kPa D. 3.14 D. 241.89 kPaExample:- check the stability of shown gravity dam if you knew that there is an effect of earth quake with k, = 0.1, ku = 0.12 The vertical acceleration is downward and the horizontal is toward reservoir = 0.75,Yw = 1 (Ton/m ), Ycon. = 2.4 (Ton/m^3) Ysubmerged silt= 1.36 (Ton/m') Y silty water1.925 (Ton/m') Wind velocity = 120 (km/hr) With straight length of water. expanse = 35 km , ka=0.3,Example:- check the stability of shown gravity dam if you knew that there is an effect of earth quake with k, = 0.1, ku = 0.12 The vertical acceleration is downward and the horizontal is toward reservoir = 0.75,Yw = 1 (Ton/m ), Ycon. = 2.4 (Ton/m^3) Ysubmerged silt= 1.36 (Ton/m') Y silty water1.925 (Ton/m') Wind velocity = 120 (km/hr) With straight length of water. expanse = 35 km , ka=0.3, all kinds of combination
- Differentiate between 'low gravity' and 'high gravity dams. Calculate the limiting height of low concrete gravity dam with the following data: Compressive strength of the concrete = 2500kN/m² Unit weight of water = 9.81 kN/m³ Specific gravity of the concrete = 2.4Q2: Answer any two branches? A- Discuss the disadvantage of rock foundation under the dams and what are their treatments? B- what are the criteria of selection the spillway type? C- What are advantage and disadvantage of Arch dams?A masonry dam of trapezoidal cross section, withone face vertical has a thickness of 60 cm at the top,3.70 m at the base, and has a height of 7.40 m.What is the depth of water on the vertical face ifthe resultant intersects the base at the downstreamedge of the middle third? Assume that the upliftpressure varies uniformly from full hydrostatic atthe heel to zero at the toe. Unit weight of concrete and masonry is 23.54 kN/m3 NOTE: CLEAR HANDWRITTEN SOLUTION
- A gravity dam has the following dimensions Height of dam Free board=100m, free board = 1m, slope at u/s = 0.15:1, Taking uniform value of ah= 0.1 determine : [i] hydrodynamic earthquake pressure, [ii] its moment at a joint situated 50 m below maximum water ssurface.Q: The following figure shows the flownet for seepage of water around a single row of sheet piles driven into permeable layer. Calculate the factor of safety against downstream heave, given that Ysat = 19 kN/m³ and yw = 9.81 kN/m³. All the relevant information are provided in the figure. HI-10m 6m ↓ Heave zone Sheet pile Impermeable layer H₂= 2 m Y-16 kN/mShow all the needed calculations that will lead you to conclude that your design is safe. Given Conditions: Coefficient of Friction is 0.5 and the soil bearing capacity is 125kPa. A dam is to be constructed to supply irrigation to farms. As a low dam its height is limited to 3m and the freeboard is set to 0.5m. Design the trapezoidal dam to be as safe under all conditions.
