Problem Set 2:5. A cubical sample of San Francisco Bay mud (a soft marine silty clay) hasbeen prepared for testing in a true triaxial device. The dimensions of thesample are 76 mm by 76 mm by 76 mm. The sample has a moisturecontent (w) of 68.5% and a moist density (r) of 1.44 g/cm³. The averagespecific gravity of solids (G,) is 2.55.Determine (a) the void ratio (e) and degree of saturation (S), (b) themoist density (g) and moisture content (w) if the soil becomes saturatedat the same total volume, and (c) the density (p) of the soil if all pore fluidis dried off with no change in total volume.Provide the Phase Diagram.

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Answered: 5. A cubical sample of San Francisco…

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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Question 23 The results of a constant head permeability test for a fine sand are as follows: Diameter of the sample = 47 cm Length of sample = 57 cm Constant head difference = 29 cm Time of collection = 345 secs Weight of water collected = 429 grams Find the seepage velocity in cm/min. if the void ratio is 0.32. Round off to four decimal places.
In a constant head permeability test in the laboratory as shown in Figure Q2(e), the data is recorded in Table Q2(b). The void ratio of the soil specimen is 0.46. Determine; (i) Hydraulic conductivity, k, of the soil in cm/sec. (ii) Discharge velocity in cm/sec.
During Atterberg limit tessts in the Naboratory,the studens obtained the following results froma clayey soil. Wumber of Blows (N) Molsture Content \ 38/4 16 36/5 20 33.1 28 2/7 0 Plastic limit tests: Students conducted two trials and found that PL= 17 2% for the first trial and PL = 18.4% for the second trial. Assume that the liquid limit of the soil iS LL= 29.0% a. Determine the flow index. b. Determine the liquidity index of the soil if the in situ moisture content is 22.0%.
The coefficient of permeability of fine sand is 0.012 cm/sec at a voids ratio of 0.57. Estimate the increased permeability using the Kozeny-Carman formula of this same sand when its voids ratio has increased to 0.72.
An undisturbed sample of fine sand is tested in the laboratory and found to have a dry mass of 4.63 kg, a total volume of 0.00198 m³ and a specific gravity of 2.70. Other laboratory tests are performed to determine the maximum and minimum density of the sand. At the maximum density, it is determined that the void ratio is 0.35 at the minimum density, the void ratio is 0.95. A. Compute the void ratio of the sand. B. Compute the relative density of the undisturbed sample. C. Compute the dry density in Mg/m³.
Problem (3) The hydraulic conductivity of a sand specimen at a void ratio of 0.55 is 0.051cm/sec. Estimate its hydraulic conductivity at a void ratio of 0.7.
Problem Set 2: 4. A sample of gray silty clay has a mass of 126 kg. Laboratory tests results give a moist density (p) of 2.05 g/cm³, a specific gravity of solids (G,) of 2.71, and a moisture content (w) of 15.7%. First determine all entries in the phase diagram. Then determine the void ratio (e), the porosity (n), the degree of saturation (S), the dry density (Pa), the dry unit weight (ya), and the moist unit weight (y). Draw the Phase diagram.
OMC-Proctor's Test A sample of dry sand has a volume of 1000 ml in its natural state. Its minimum volume when compacted is 750 ml. When gently poured into a measuring cylinder, its possible maximum volume is 1320 ml. what is the relative density?
Ex Two identical soil samples (A) and (B) of a fully saturated N.C.C. were tested. Sample (A) was subjected to an unconfined compression test and failed when the deviator stress (OT-13) was (200) kN /n². Sample (B) was tested under UU conditions with a cell pressure of (300) kN/m². The pore water pressure at failure. was (200) kN/m². a) What was the pore water pressure at failure in sample (A). b) If C=o, Find (2) for this clay. (Itint. Start with soil B, and that (OJ) un= (FJ) afined). unconfined
For a constant head laboratory permeability test on a fine sand, the following values are given: Length of specimen, L:6.75 in Diameter of specimen: 4 in Head difference,h: 23 in Water collected in 6 mins: 0.917in³ Void Ratio:0.23 Find the seepage velocity (Vs) in in/min
A cylindrical specimen of dry sand with a minimum and maximum void ratio (emin and emax) of 0.5 and 0.8 respectively has a relative density of 45%. If the specimen is compacted such that the relative density is 60%, what will be the decrease in height of the sample if the initial height was 15cm? Assume that the specimen diameter remains constant such that any volume change occurs only as a change in height.

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