For the flow situation below whereby saturated unit weight of soil is 19.62 kN/m^3 and unit weight of water is 9.81 kN/m^3 determine the height of the water (above the datum) in the open stand pipe (on the left side) that will cause the quick condition in the sand. Provide the answer in meters to one decimal digit. 4.5m Sand D

For the flow situation below whereby saturated unit weight of soil is 19.62 kN/m^3 and unit weight of water is 9.81 kN/m^3 determine the height of the water (above the datum) in the open stand pipe (on the left side) that will cause the quick condition in the sand. Provide the answer in meters to one decimal digit. 4.5m Sand D

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter8: Stresses In A Soil Mass

Section: Chapter Questions

Problem 8.14P

See similar textbooks

Similar questions

4- Refer to Figure below. If Hj=3 ft, H2=4.5 ft, h=1.5 ft, ysai=118.9 lb/ft', area of the tank=6.25 ft', and hydraulic conductivity of the sand (k)=5.3x10-³ ft/sec, What is the rate of upward seepage of water (ft'/min)? b. If the point C is located at the middle of the soil layer, then what is the effective stress at C? а. (孟) Valve (open) Inflow 不

The figure shown is a dewatering plan to build the foundations of an office building below the water table without the sheet-piling. Assume that all b = 6 meters and all 1 = 4 meters in all grids of the middle flow channel. Dewatering wells Marshy soils Ah =Sm Excavated site OL Ah = 2m Ah = 2m Ah = 2m Lowered WT a. What is the value of n? b. How many flow channels are in the figure? c. How many potential drops are in the figure? d. The potential drop at area 1 is: e. The potential drop at area 2 is: f. The potential drop at area 3 is: g. The average hydraulic gradient in each net is:
The figure shown is a dewatering plan to build the foundations of an office building below the water table without the sheet-piling. Assume that all b = 6 meters and all 1 = 4 meters in all grids of the middle flow channel. Dewatering wells Marshy soils Ah =m Excavated site OL Ah = 2m Ah = 2m Ah = 2m Lowered WT a. What is the value of n? b. How many flow channels are in the figure? c. How many potential drops are in the figure? d. The potential drop at area 1 is: e. The potential drop at area 2 is: f. The potential drop at area 3 is: g. The average hydraulic gradient in each net is:
Q3 Figure Q3 shows a flow net for flow through a weir, the base of which is 2m below the ground surface, in a permeable soil layer. Given that the coefficient of permeability = k = 5x103 cm/sec, determine the following: 14 m 7 m 8 m a bc d e' f' 10 m k, = k. = k Impermeable laye Figure Q3 a) Total head (m) at point a, b, c, d, e, and f. b) Uplift pressure (or water pressure, kPa) at point a, b, c, d, e, and f. c) The total rate of seepage per unit length through the permeable layer.
Soil sample and flow condition are shown in the following figure: Inflow C 2m Outflow Soil ↑ B A Ysat of sand = 20 kN/m³, Yw= 20 kN/m³ (i) Find the head, h required to cause quick condition. h 2m 10m Compute the seepage force per unit volume at quick condition. Use cross-section area of tube as 1 m². (iii) A student accidentally broke the left hand riser tube to the point C at an elevation 2 m above point A. Assuming that the water level is now maintained at C, compute the new hydraulic gradient, effective stress at elevation A and seepage force at elevation A.
: Water flows over a smooth submerged object in a channel of width 1.2 m. The water depth upstream of the object is 2.2 m and the water depth downstream is 0.5 m. i) Use the Bernoulli and Continuity equations to calculate the discharge within the channel, and sketch the energy grade line and hydraulic grade line for this problem. ii) The measured discharge in the channel is 2.4 m³/s. Calculate the discharge coefficient, and describe what this physically represents. iii) A pitot tube (or stagnation tube) is placed in the downstream part of the channel, where the water depth is 0.5 m. Calculate the height to which water will rise within this pitot tube (above the depth of water in the channel).
In a circular channel 2.5meters in diameter, flowing below half full, the water surface width is 2.415meter in length. a.Compute the hydraulic radius. b.The channel is laid on a grade of 24.146meters per mile; compute its discharge using Manning’s formula withn= 0.025. c.For flow as in (b), compute the C value in the Chezy formula. d.Using C in (c), and for flow as in (b), compute the value of Kutter’s nin the Kutter’s C formula. Simplify your solution, no solution by calculator or shift solve. e.Compute the maximum velocity that may occur for the given circular channel using as in (d) and Manning’s formula.
You are in charge of evaluating a segment of aqueduct pipe (diameter: 30cm). You know that pt. A has a measured pressured of 500 kPa. You must : a) Determine the head-loss between points A and B if they are separated by 100m, that the pipe has a flow of 175 1/s and that the Hazen-Williams coefficient is 100 (see figure 3) b) Calculate the absolute roughness (&). Presume that the water temperature is 15oC. A A Figure 3 Aqueduct pipe c) We wish to limit head-loss to 10 kPa, all the while transporting the same flow between points A and B. To do this, it has been suggested that a second pipe could connect these two points (see figure 4). You must determine this second pipe's diameter knowing that the total length of this secondary pipe is 135m and has the same Manning coefficient as the first pipe. Neglect all local head-loss B Figure 4 Proposed secondary pipe (dotted line) B
Consider a heterogeneous system in which groundwater flow is parallel to layers of varying hydraulic conductivity. The gradient (Ah/Ax) of this system is 0.13. Find total discharge through the system K1 = 0.4 cm/sec b1 = 10 m %3D K2 = 0.3 cm/sec b2 = 20 m %3D %3D K3 = 0.2 cm/sec b3 = 30 m %3D
Take note: Answer and write your solution on a clean paper clearly. During a flood flow the depth of water in a 12 m wide rectangular channel was found to be 3.5 m and 3.3 m at two sections 300 m apart. The drop in the water-surface elevation was found to be 0.18 m. Assuming Manning’s coefficient to be 0.023, determine the following: a. Average value of k? b. Estimate the flood discharge through the channel ?
Question 2 Figure 2.1 shows the formation of a hydraulic jump in a rectangular open channel having a base width, B, of 3 m, a bed slope of 0.004, the Manning's coefficient, n, of 0.01 and a discharge, Q, of l15 m³/s. Determine the state of flow, yı and the head loss in the jump. Y2 Yo So = 0.004 n= 0.01 Fr,1 Figure 2.1: Hydraulic Jump
Onestion 2 : Choose the correct letter, A, B, C or D A 1 Esumate the flow velocity in m/s through a best hydraulic circular channel of 2 m diameter with a bed slope of 0.001 and n=0.012. 2 For a rectangular channel if the discharge per unit width= 10 m³/s.m, the critical velocity in m/s is? 3 For a rectangular channel if the flow velocity = 1.5 m/s, and the flow depth = 2m, what is the classification of this flow? 4 For a rectangular channel, if the Froude number = 1.5 and the initial depth=0.8 m, the depth after hydraulic jump occurs is: 5 At the exit flow under a sluice gate the depth of flow was 0.5 m, if y2=1.5 m, calculate the head loss across the jump 6 The pump curve of single pump is given by Hp = 15-100², if the system curve Hsu =20-20², estimate the flow delivered to the system by 3 pumps in series in m³/s 7 The pump curve of single pump is given by H₂=40-25Q², if the system curve HSH =20-20², estimate the flow delivered to the system by 3 pumps in parallel in m³/s What is…