7.8 The following data are for a falling-head permeability test: • Length of the soil sample = 140 mm • Diameter of soil sample = 70 mm • Area of the standpipe = 19.6 mm² • At time t = 0, head difference = 500 mm • At time t = 7 min, head difference = 350 mm a. Determine the hydraulic conductivity of the soil (cm/sec) b. What was the head difference at t = 5 min?

7.8 The following data are for a falling-head permeability test: • Length of the soil sample = 140 mm • Diameter of soil sample = 70 mm • Area of the standpipe = 19.6 mm² • At time t = 0, head difference = 500 mm • At time t = 7 min, head difference = 350 mm a. Determine the hydraulic conductivity of the soil (cm/sec) b. What was the head difference at t = 5 min?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The figure shows the layers of soil in a tube that is 100mm x 100 mm in cross section. Water is supplied to maintain a constant head difference of 450 mm across the sample. The hydraulic conductivity of the soils in the direction of flow through them are given below. Compute the equivalent hydraulic conductivity in m/hr. Water supply h=450 mm Out flow Direction of flow Soil Soil Soil A B 200 200 200 mm mm mm K, = 2 x 10-4 cm/s KR = 3.7 x 10-2 cm/s Kc = 1.2 x 10 -5 cm/s Select one: a. 0.002124 b. 0.002412 c. 0.001224 d. 0.004221
PROBLEM D For a falling head laboratory test, the following are the given values: • Length of soil specimen 480.0 mm Initial head 700.00 mm = Final head = 395.00 mm Duration of test = 5.5 mins 0.97 sq.cm Area of standpipe Area of specimen 18.0 sq.cm A. Compute for the hydraulic conductivity of the soil in cm/sec. B. Determine the head di fference at t = 3.50 mins.
2. The figure below 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 H across the sample. Hydraulic conductivities of each soil are tabulated below. All measurements in the figure are millimeters. If H =.
Problem (2) The following data are for a variable head permeability test: Area of soil specimen=1200mm? Length of the soil specimen = 150mm Area of the standpipe = 1.3cm² At time t=0, head difference = 750mm At time t=2min, head difference = 500mm 2 %3D a) Find the hydraulic conductivity of the soil in cm/min.
Calculate the hydraulic conductivity of the soil in cm/sec. Determine the seepage velocity, in cm/sec, if the porosity of soil is 0.25. Find the head difference, in mm, at t = 100 seconds.
A cylindrical soil sample with length = 15cm and diameter = 4cm was taken from a site where a groundwater contamination piume was found. The sample was tested in the lab to determine its hydraulic conductivity. A hydraulic gradient of 0.05 was applied across the sample, and a flow rate of 0.025 cm³/sec was measured. Calculate the hydraulic conductivity of the soil sample using Darcy's law.
For each of the three cases shown in Figure 3 determine: a). the pressure head, elevation head, total head, and cumulative head loss at the entrance, exit and point A of the soil sample. For each case, set the datum at the tail water elevation. b). the discharge velocity and the seepage velocity if the soil's permeability coefficient is 0.10 cm/s and the porosity is 40%. POTTAWA c). the discharge velocity and the seepage velocity if the soil's permeability coefficient is 0.001 cm/s and the void ratio is 0.600. BAINA LE DROIT 3 m 4m + 2m A. Case I ez ilise ROTÉGÉ PAR 3 m 1m 4m est cadre A. Case II sirez 1 m e mate ificati Figure 2 dood 3 m 5 m TED MATERIA Case III urse are rected by cop not harmission to up nox clarification, ple 1 m
please solve the following problems
For a falling head permeability test, the following values are given: Length of specimen: 200 mm Area of specimen:1000 sq. mm Area of standpipe: 40 sq. mm Head difference at t= 0: 500 mm Head difference at t= 180 sec : 300 mm Determine the hydraulic conductivity (cm/sec)
Don't mind the circle Ps. Not graded