Consider the permeameter shown below. The water levels are held constant through

Question

Consider the permeameter shown below. The water levels are held constant throughout this test through the use of overflow weirs. Points A, B, and C are located at the centerpoint of the square cross section (Area = 400 cm2) of the soil sample. Fill in the table below using the Datum shown in the figure as your reference. What is the pore water pressure (u) at Point B? It was determined that 50 cm3 flowed through the soil sample in 1 minute. What is the hydraulic conductivity of the soil? Grain size distributions and Atterberg Limits for four inorganic soils are shown below. Please determine the following: AASHTO Classification for Soil 1: USCS Classification for Soil 1: USCS Classification for Soil 3: USCS Classification for Soil 4: Please find the LL and PL for Soil 2 given the data below: Soil 2: PL = LL = Soil 2: Plastic Limit Test Results Sample 1: w = 11.5% Sample 2: w = 13.2% Sample 3: w = 13.5% Soil 2: Liquid Limit Test Results The standard proctor compaction curve for a soil (Gs = 2.65) is shown below. The construction specifications are as follows: RC ge 95% (standard proctor) wopt le wfield le wopt + 3% Draw the acceptable zone of compaction on the figure above. Assume this soil is a clay soil. Based on the specs, what is a likely application for this soil? What would you expect the structure of this clay to look like provided the specs are met? (You may draw a picture or provide a written description.) A total of 5,000 ft3 of compacted fill was required for this project. Results from a sand cone test on the compacted soil indicate that w = 13.1% and gamma T = 125.5 pcf. What is the degree of saturation of the compacted soil? (Reminder Gs = 2.65). If the natural water content of the borrow soil is 10% and the porosity of the borrow soil is 0.33, determine (i) the total weight of borrow soil needed, (ii) the dry unit weight of the borrow soil, and (iii) the volume of water that had to be added to the borrow soil. Use the phase diagrams below to solve this problem. You will need to use the information for the compacted fill found in part (d). FINAL ANSWERS: (i) WT = (ii) gamma d = (iii) Delta Vw =

Explanation / Answer

PROBLUM 4).

a. clayey soils A-7

b.silty or clayey gravel and sand A-2

c. silty or clayey gravel and sand A-2-7

d.fine sand A-3

e. LL is the water content w.r.t. 25 no of blows so by curve it is arround 19

PL is the water content at which soil started cracking so it is 13.5.

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