CEG3011 Homework 2

CEG3011 Homework 2 - Problem 3 Determine percent gravel...

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CEG 3011 - Soil Mechanics Spring 2010 Homework 2 Problem 1 Following are the results of a mechanical sieve analysis: Sieve No. Mass of Soil Retained (g) 4 28 10 42 20 48 40 128 60 221 100 86 200 40 Pan 24 a) Determine the percent finer than each sieve and plot a grain-size distribution curve. b) Determine D 10 , D 30 , and D 60 from the grain-size distribution curve. c) Can you find a C u and C c Problem 2 Following are the results from the liquid and plastic limit tests for a soil: Number of Blows (N) Moisture Content (%) 14 38.4 16 36.5 20 33.1 28 27.0 Water content at which 1 / 8 ” threads of soil are rolled to the point they just begin to crumble: 12.2% a) Draw the flow curve and obtain the liquid limit (LL) B) What is the plastic limit of the soil (PL) b) What is the plasticity index of the soil (PI)
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Unformatted text preview: Problem 3 Determine percent gravel, percent sand, percent fines D 10 , D 30 , D 60 C U , C C for soils A, B, and C in the attached Figures in accordance with USCS Problem 4 Classify Soils A,B, and C in accordance with USCS Problem 5 • TRUE/FALSE - Mechanical properties of sands are controlled by grain size, shape, and surface roughness • In the USCS a soil is classified by a symbol XY. What does X and Y indicate • Name two Atterberg limits. • TRUE/FLASE – MH is a unified Soil Classification System symbol for a high plasticity Marine soil. • TRUE/FLASE – MH is a unified Soil Classification System symbol for a high plasticity Marine soil • What are a CH soil, SW soil • TRUE/FLASE – All soils finer than the #200 sieve are clay minerals...
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This note was uploaded on 10/29/2011 for the course CEG 3011 taught by Professor Staff during the Spring '07 term at FSU.

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CEG3011 Homework 2 - Problem 3 Determine percent gravel...

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