Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 9, Problem 9.12P
(a)
To determine
Find the rate of upward seepage of water.
(b)
To determine
Find the effective stress
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Problem 4:
An inclined permeameter tube is filled with layers of soil of different permeability as shown below. Find the
total head, elevation head and pore water pressure at points (A-B-C-D) with respect to the given datum, Given:
1.5k1=2k2=3k3=k4
k4=2x10-3 cm/sec
35 сm
9 cm
K4
K3
K1
K2
15 cm
11 cm
7 cm
4 cm
Datum
شاشة
4cm
19
15
Chapter 9 Solutions
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- H k, H, H k, H A layered soil is shown in the figure above. Estimate the equivalent hydraulic conductivity for flow in the vertical direction. Suppose that ki = 5.0 ×10¬4 cm/s, k2 = 4.0 ×10-4 cm/s, k3 = 4.0 ×10-4 cm/s, k4 = 1.0 ×10¬4 cm/s, Н - 2.0 m. H, - 2.0 m. Hз - 2.5 m. На - 2.5 m. (Enter your answer to three significant figures.) kyle) cm/sarrow_forwardThe 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) Inflowarrow_forward(Situation 3) Determine the equivalent hydraulic conductivity of the soil strata given in the figure considering direction of flow of water parallel and perpendicular to the layers. k = 2.3 x 102 cm/s k, = 8 x 102 cm/s k, = 5.7 x 10 cm/s, k, = 25.5 x 104 cm/s 10 m 2 m! = 9.2 x 10 cm/s k, = 27 x 107 cm/s 10 m %3!arrow_forward
- a. For Figure 2 below, calculate the effective hydraulic conductivity for flow parallel and perpendicular to layering. Show your work. Explain the difference in values. Figure 2 sand layer; K = 1 m/d; thickness = 5 d 10.5 m clay layer; K = 0.000001 m/d; thickness = 0.5 m sand laver: K = 1 m/d; thickness = 5 m b. Figure 3 below shows the effects of groundwater refraction, assuming that groundwater flow in the top layer is almost horizontal i.e., a = 89.8°, what is B and what can you say about the flow in the clay layer? a a K, b B K Figure 3.arrow_forward1. Calculate the variation of σ, u, and σ’ with depth. Given: H1 = 12 ft, H2 = 8 ft, H3 = 5 ft, S = 50% in capillary rise zone. 2. Plot the variations of σ, u, and σ’ with depth.arrow_forwardAnswer in three decimal places pleasearrow_forward
- The hydraulic gradient is a rock that is porous and permeable enough to transmit water easily. b the difference in hydraulic head between two points, divided by the distance between them. c rock that is low in permeability so that water flows very slowly through it. d a relationship of groundwater flow rate between two point to the difference in hydraulic head between them. 2. An artesian well is one in which a pressurized groundwater rises from a deep, unconfined aquifer. b water rises above the top of the confined aquifer without any pumping. c the well is horizontal and the water table is perched. d Paint colors are mixed. e the water is warm, fairly saline, and recharged by an affluent stream. 3. A cone of depression is a a solid or hollow object which tapers from a circular or roughly circular…arrow_forwardThe 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) Inflowarrow_forwardA falling head hydraulic conductivity test is performed on a sample of soil. The stand pipe having a diameter of 0.20cm is observed and it takes 60 seconds for the water to drop by 50 cm from an initial hydraulic head of 90cm. The sample has a length of 20cm, and a diameter of 4cm. a.Find the coefficient of permeability (cm/sec) b.Solve for the hydraulic gradient c. Compute the rate of flow of water in the soil. (cm' /sec.) 0.20 cm 6 s TAND PIPE 50cm Acm 不 20am -: SOILarrow_forward
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