EBK FOUNDATION DESIGN
3rd Edition
ISBN: 9780133424478
Author: CODUTO
Publisher: YUZU
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Chapter 3, Problem 3.17QPP
To determine
The plot of pore water pressure, total vertical pressure, effective total pressure and shear strength on the horizontal plane versus depth.
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Q-In a groundwater field test, a tracer took 8 hours to travel between two observation wells
which are 56 m apart. The difference in water table elevations in these wells was 0.70m.
The volume of the void of the aquifer is 30% of the total volume of the aquifer. What is the
hydraulic conductivity of the aquifer, if the dynamic viscosity of water is 0.995×10-³Ns/m³?
Question 01:
Briefly discuss the significance of determining falling head permeability (hydraulic conductivity).
Briefly discuss the relationship of Darcy’s law and constant head test.
Is it suitable to perform constant head permeability test on clayey soil to determine its hydraulic conductivity? State your answer with valid reasons.
Subject: Geotechnical Engg
The hydraulic conductivity of soils can be determined in several ways. Described one method used to determine a soils hydraulic conductivity.
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Chapter 3 Solutions
EBK FOUNDATION DESIGN
Ch. 3 - Explain the difference between moisture content...Ch. 3 - A certain saturated sand has a moisture content...Ch. 3 - Consider a soil that is being placed as a fill and...Ch. 3 - A sample of soil has a volume of and a weight of...Ch. 3 - A site is underlain by a soil that has a unit...Ch. 3 - The sub-surface profile at a certain site is shown...Ch. 3 - A vertical load of 300 kN is applied to a area at...Ch. 3 - A vertical load of 20 k is applied to a area at...Ch. 3 - 3m3m footing is to be built on the surface of a 15...Ch. 3 - A 3 ft square footing carries a sustained load of...
Ch. 3 - A 2m thick fill is to be placed on the soil shown...Ch. 3 - Estimate the effective friction angle of the...Ch. 3 - Explain the difference between the drained...Ch. 3 - A soil has c=5 kPa and =32. The effective stress...Ch. 3 - A footing with an embedment of 2 m is embedded in...Ch. 3 - Prob. 3.16QPPCh. 3 - Prob. 3.17QPPCh. 3 - A 9 ft thick fill is to be placed on the soil...
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- Refer to Figure 7.24. The following data were collected during the field permeability measurement of a confined aquifer using a pumping test. Determine the hydraulic conductivity of the permeable layer. Use Eq. (7.49). Thickness of the aquifer, H = 4.5 m Piezometric level and radial distance of the first observation well: h1 = 2.9 m; r1 = 17.8 m Piezometric level and radial distance of the second observation well: h2 = 1.8 m; r2 = 8.1 m Rate of discharge from pumping, q = 0.5 m3/minarrow_forwardIn geological investigation, why is it important to determine the Groundwater conditions in the region?arrow_forwardA pumping test was carried out in a soil bed of thickness 15 m and the following measurements were recorded. Rate of pumping was 10.6 x 10^-3 m3/s ; drawdowns in observation wells located at 15 m and 30 m from the center of the pumping well were 1.6 m and 1.4 m, respectively, from the initial groundwater level. The initial groundwater level was located at 1.9 m below ground level. Determine k in cm/s. a.2.6 x 10^-6 b.6.7 x 10^-1 c.3.47 x 10^-2 d.5.0 x 10^-2arrow_forward
- Outline practical reasons why the elevation (depth) of the groundwater table in an area may fluctuate seasonally or annually.arrow_forwardQ Search Size Analysis_Part 3.pdf EXAMPLE 1: Following are the results of a sive analysis: a)Determine the percent finer than each sieve size and plot a Grain Size Distribution Curve (GSDC) b)Determine D10, D30, and D60 from the GSDC c) Calculate uniformity coefficient (Cu) Calculate Gradation coefficient (Cc) Results of sieve analysis Sieve Mass of retained openings soil on each sieve (mm) US Sieve # (g) 4 4.750 0.0 10 2.000 21.6 20 0.850 49.5 40 0.425 102.6 60 0.250 89.1 100 0.150 95.6 200 0.074 60.4 PAN 0.000 31.2 Total mass of soil= 450 g Desktoparrow_forwardA pumping test was carried out in a soil bed of thickness 20m and the following measurements were recorded. • Rate of pumping = 9.5x103 m³/s • Drawdowns in observation wells %3D located at 13m and 33m from the center of the pumping well were 2.00m and 1.27m, respectively from the initial groundwater level. • Initial groundwater level was located at 1.9m below ground level. Determine hydraulic conductivity in cm/sarrow_forward
- Sketch the figure and determine coefficient of permeability (k) in mm/min using constant head permeability, given the following data, Water flows horizontally The height of the reservoir supply source is 2 m above the elevation of the outlet. The soil sample length in the direction of water flow is 200 mm. The cross-sectional area of the soil sample is 1,950 mm2. The measured volume of flow for the steadystate condition is 500 ml in a 10-minute time period.arrow_forwardPlease answer all 1. List the three corrections which should be applied to the hydrometer readings. 2. Why is it important to remove the hydrometer from the measuring cylinder between readings? 3. A hydrometer test has the following results; Gs = 2.70, temperature = 240C, and L = 92 mm at 60 minutes after the start of sedimentation. Calculate the diameter of the smallest-size particles that have settled beyond the zone of measurement at that time (use the table in the lab manual to find, A=0.0128). D(mm) = A sqrt( L(cm) / t(min) )arrow_forwardA constant-head permeability test is performed where the hydraulic gradient is 0.75. The crosssectional area of the sample is 0.25 ft2. The quantity of water flowing through the sample is measured to be 0.004 ft3/minute. (a) What is the coefficient of permeability in feet per minute? (b) What is the coefficient of permeability in millimeters per second?arrow_forward
- Figure shows the layers of soil in a tube 100 mm x 100 mm in cross-section water is supplied to maintain a constant head difference of 400 mm across the sample. The hydraulic conductivities of the soils in the direction of flow through them are shown in the figure. Compute the rate of supply in cu.cm/hr. * Water supply 295.90 0.08219 400 Out flow 0.0002959 100 Direction of flow 8.219 100 em/sée. cm/iec. cm/sec 200 200 200 himarrow_forwardRelationship of Fr with water saturation 1. How important is the saturation exponent factor n? 2. What influences the magnitude? 3. Mention several methods to find these quantities and include references!arrow_forward7.4 A groundwater sample from well #25 has 123 mg/L of Ca2+ and 21 mg/L of Mg2+. Using this information, express the hardness of the groundwater sample in meq/L and mg/L as CaCO3.arrow_forward
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