7.23 7.23 Refer to Figure 7.25. During an auger hole test to determine field permea-bility, it was observed that the water table inside the hole rose by 5 cm in 8min, when h = 2 m. Given: diameter of the auger hole = 150 mm, length ofauger hole = 4 m, and depth of the ground water table from the surface = 1m. Estimate k. Use Eq. (7.50).k = 0.617 w dhSd dt(7.50)where the radius of the auger holedthe depth of the hole below the water table9ANK42-Based on Spangler and Handy(1973)rld=0.020.040.060.100.160.300.40.20.8hld(a)(b)Figure 7.25 Auger hole test: (a) auger hole; (b) plot of S with h/d and r/dS = the shape factor for auger holedh/dt = the rate of increase of water table at a depth h measured from thebottom of the hole0.61.0

Given, h = 2 m dw = 150 mm L = 4 m

7.23 Refer to Figure 7.25. During an auger hole test to determine field permea- bility, it was observed that the water table inside the hole rose by 5 cm in 8 min, when h = 2 m. Given: diameter of the auger hole = 150 mm, length of auger hole = 4 m, and depth of the ground water table from the surface = 1 m. Estimate k. Use Eq. (7.50). k = 0.617" dh Sd dt (7.50) where r = the radius of the auger hole d = the depth of the hole below the water table

7.23 Refer to Figure 7.25. During an auger hole test to determine field permea- bility, it was observed that the water table inside the hole rose by 5 cm in 8 min, when h = 2 m. Given: diameter of the auger hole = 150 mm, length of auger hole = 4 m, and depth of the ground water table from the surface = 1 m. Estimate k. Use Eq. (7.50). k = 0.617" dh Sd dt (7.50) where r = the radius of the auger hole d = the depth of the hole below the water table

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter6: Hydraulic Conductivity

Section: Chapter Questions

Problem 6.9P

See similar textbooks

Similar questions

Show complete solution
The volume of a rock is found to be 0.00015 cu.m. If the rock's specific gravity is 2.6, determine the weight of the rock. A) 12.67 N B) 8.21 N c) 3.83 N D No Answer among the choices E) 19.78 N
In a pressuremeter test in a soft saturated clay, the measuringcell volume Vo = 535 cm3, po =42.4 kN/m2,pf =326.5 kN/m2, vo =46 cm3, and vf = 180 cm3.Assuming Poisson’s ratio smsd to be 0.5 and using Figure3.31(attached), calculate the pressuremeter modulus (Ep).
Problem (4.2): A lunar soil sampler consists of a tubular shaft that has an inside diameter of 45 mm and an outside diameter of 60 mm. The shaft is made of stainless steel, with a shear modulus G = 80 GPa. In Figure (4.23), the sampler is being removed from the sampling hole by two 150-N forces that the astronaut exerts at right angles to arm DE and parallel to the lunar surface. Assume that the external torque that is exerted by the soil from A to B is uniformly distributed, with magnitude to. (a) Determine the maximum shear stress in the shaft of the sampler tube AC, and indicate the location (s) where it acts. (b) Determine the angle of twist of end C with respect to end A, that is, determine: ØC/A = Øc - ØA D 150 N 125 mm 125 mm 150 N d. = 60 mm 1.5 m orbala Lunar soil Colle
Calculate the porewater pressure change after rapid drawdown in the soil at the depth of soil and depth of water 30ft and 46.2ft respectively and the unit weight of soil is 120 lb/ft. Given that B = 0.14. %3D Answer:
shown in the figure. The coefficient of permeability of the Water is flowing through the permeability apparatus as coil is k m/s and the porosity of the soil sample is 0.50. 0.4 m Soll 0.8 m 0.4 m The total head, elevation head and pressure head in metres of water at the point R shown in the figure are
17
A confined aquifer of 15 m constant thickness is sandwiched between two aquicludes as shown in the figure. (not drawn to scale) Piezometer P 55.2m Piezometric Surface m Aquiclude Aquifer Aquiclude L = 2500m Piezometer Q TTTTTR 34.1m The heads indicated by two piezometers P and Q are 55.2 m and 34.1 m, respectively. The aquifer has a hydraulic conductivity of 80 m/ day and its effective porosity is 0.25. If the distance between the piezometers is 2500 m, the time taken by the water to travel through the aquifer from piezometer location P to Q (in days, round off to 1 decimal place) is
Example A direct shear test when conducted on a remolded sample of sand, gave the following observations at the time of failure; Normal force = 288 N; shear force 173 N. The cross sectional area of the sample= 36cm². Determine the angle of frictional. Solved in 2 ways, namely graphically and analytically (31 degrees) B
Complete table
Wells drilled into unconfined aquifers are called artesian wells. Select one: True False
Q: I an oedometer test on a specimen of saturated clay (Gs = 2.72), the applied pressure was increased from 107 1o 214 kPa and the following compression readings recorded: TaBLE| Tmen 0 025 05 1 225 4 &5 9 16 Guugelmm) 78 742 732 721 6% 678 &6 643 637 Teme(mi) 25 % 4 s om0 X0 a0 Guge(nm) 629 626 621 618 616 615 610 602 After 1440 min, the thickness of the specimen was 15.30 mm and the water content was 23.2%. Determine the values of the coefficient of consolidation and the compression atios from (a) the root time plot and (b) the log time plot. Determine also the values of the coefTicient of volume compressibility and the coefficient of permeability.