Principles of Geotechnical Engineering (MindTap Course List)
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 2, Problem 2.3P

(a)

To determine

Calculate the uniformity coefficient (Cu) and coefficient of gradation (Cc) for sands A, B, and C.

(b)

To determine

State the sands A, B, and C are well-graded or a poorly-graded.

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The Grain size analyses results are given in Figure 1 for Soils A and B. Answer the following questions: i) The uniformity coefficient, Cu (= D60/D10) for Soil A is ii) Soil B is classified as.. ..... grained soil. iii) If liquid limit (LL) and plastic limit (PL) values of Soil A are given as 65 % and 35%, then the soil is classified as ................. by using plasticity chart provided below. PLASTICITY INDEX (PI) Percentage Smaller 50 40 30 100 90 20 80 70 60 50 40 30 20 10 0 0,001 For clessification of fine-grained soils and fine-grained fraction of course-grained Equation of A-line Horizontal et PI-4 to LL-25.5 Then PI-0.73 (LL-201 Equation of "u-line Vertical et LL-16 to PI-7 then PI-0.9 (LL-8) Z MHO OH ML OL soills 10 Soil A X 20 0,01 0,1 Particle Size (mm) Figure 1.Grain Size Distribution CLOL LOWING 1 CH OH Soil B LIQUID LIMIT (LL) FG4 Plasticity Chart Figure 2. Plasticity Chart 10 Tio
2. The following table shows results of testing of two types of soil: Soil G, W% S, LL PL A. 2.22 25 0.95 0.35 22 В 2.72 38 1.01 0.62 26 C 2.66 45 0.92 0.80 35 Answer the question below: I. Which of these soils contains less clay particles? Note ** show in solution process answers II. Which of these soils has a less void ratio? Note ** show in solution process answers III. Which of these soils has a less dry density? Note ** show in solution process answers
SITUATION 1 A sample of soil has the following grain- size characteristics given below. Determine the following: (a) Percentage of silt. (b) Soil classification using the Triangular Classification Chart. (c) Determine the activity classification if the plasticity index is 34%. Grain- size for Situation 1 SIZE (mm) PERCENT PASSING 2.000 100 0.075 74 0.050 60 0.005 32 0.002 15
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