EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
9th Edition
ISBN: 9781337517218
Author: SOBHAN
Publisher: VST
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Chapter 2, Problem 2.2P
To determine
Calculate the uniformity coefficient
State is it a well-graded or a poorly-graded soil.
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SIZE (mm)
PERCENT FINER
2.0
90.1
0.073
53.96
0.053
41.9
0.0045
25.16
0.0017
10.1
A sample of residual soil developed on shaly sandstone has the following grain-size characteristics. USING USDA, DETERMINE THE FOLLOWING AND SHOW COMPLETE SOLUTION. PLOT THE GRAPH.
(ALL FINAL ANSWER IS IN 3 DECIMAL PLACES)
1. Determine the modified percentage of sand.
2. Determine the modified percentage of silt.
3. Determine the modified percentage of clay.
4. Determine the classification of soil.
Problem 2.1: The following values for a sand are given: D10 = 0.3 mm, D30 = 0.41 mm, and D60 = 0.77 mm.Determine Cu and Cc, and state if it is a well-graded or a poorly-graded soil.
The following values for sand are given: D
10
= 0.28 mm „D = 0.45 mm ,D
30
0.7mm.
60=
Determine C (Coefficient of uniformity) and C (Coefficient of curvature) and state if it is a well graded or a poorly graded soil
Chapter 2 Solutions
EBK PRINCIPLES OF GEOTECHNICAL ENGINEER
Ch. 2 - For a gravel with D60 = 0.48 mm, D30 = 0.25 mm,...Ch. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - The following are the results of a sieve analysis....Ch. 2 - Repeat Problem 2.4 with the following data. 2.4...Ch. 2 - Repeat Problem 2.4 with the following data. 2.4...Ch. 2 - Repeat Problem 2.4 with the following data. 2.4...Ch. 2 - The following are the results of a sieve and...Ch. 2 - Repeat Problem 2.8 using the following data. 2.8...Ch. 2 - Repeat Problem 2.8 using the following data. 2.8...
Ch. 2 - The grain-size characteristics of a soil are given...Ch. 2 - Repeat Problem 2.11 with the following data. 2.11...Ch. 2 - Repeat Problem 2.11 with the following data. 2.11...Ch. 2 - A hydrometer test has the following result: Gs =...Ch. 2 - Repeat Problem 2.14 with the following values: Gs...Ch. 2 - Three groups of students from the Geotechnical...Ch. 2 - Refer to Problem 2.C.1. Results of the sieve...
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- 2.4 The following are the results of a sieve analysis. 2.1 For a gravel with Dg = 0.48 mm, D = 0.25 mm, and Dn = 0.11 mm, calculate the uniformity coefficient and the coefficient of gradation. Is it a well-graded or a poorly graded soil? 2.2 The following values for a sand are given: Dn = 0.3 mm, D = 0.41 mm, and D = 0.77 mm. Determine C, and C, and state if it is a well-graded or a poorly-graded soil. U.S. sieve no. Mass of soil retained (g) 4. 10 18.5 20 532 40 90.5 60 818 100 92.2 200 585 Pan 26.5 a. Determine the percent finer than cach sieve and plot a grain-size distri- bution curve. b. Determine Dg. Dy. and D, for each soil. . Calculate the uniformity coefficient C d. Calculate the coefficient of gradation C,.arrow_forward100 cm3 saturated sample of quartz sand is weighed, gravity drained, weighed, oven dried, and weighed again. The saturated, gravity-drained, and oven-dried weights are 130g, 110 g, and 105 g, respectively. Given that the soil sample above has porosity of 35%. i. Determine the void ratio of this soil. ii. If 50% of the void space is filled with water, with the remaining 50% filled with air, determine the volumetric water content, θ. iii. and the degree of saturation, S.arrow_forward22. For a soil specimen, the following are given: % passing Sieve No. 4 = 92% % passing Sieve No. 10 = 81% % passing Sieve No. 40 = 78% % passing Sieve No. 200 = 65% LL = 48% PI = 32% a. Classify the soil by the AASHTO system. b. Classify the soil by the USCS.arrow_forward
- 1. A dry sand is placed in a container having a volume of 0.0092 cubic centimeter. The dry unit weightof the sample is 0.015 gram. Water is carefully added to the container so as not to disturbed thecondition of the sand. When the container is filled, the combined weight of soil plus water is 0.0182gram.a. Determine the specific gravity of soil particle.b. Determine the dry unit weight of soil.2. If the soil sample has a water content of 11% and a unit weight of 19.67 kN/m3 , determine thepercentage of air in voids and the degree of saturation if the specific gravity of soil solid is 2.75.3. If the soil sample has a specific gravity of 2.71 and a porosity of 0.345, determine the saturated unitweight and the bouyant unit weight.4. A soil sample having a liquidity index of 0.85, a plasticity index of 16.50 and a plastic limit of 11.45.The soil sample has a specicfic gravity of 2.68 and a void ratio of 0.77.a. Compute the degree of saturation.b. Compute the air void ratio.arrow_forwardThe results of a laboratory test of a sand are emax= 0.91, emin= 0.48. a. what is their relative compactness?arrow_forwardGive its consistency index. EXERCICE 3 Classify the following soil using the Unified Soil Classification (ASTM standard). Percentage passing N° 4 seive = 98 Percentage passing N° 10 seive = 86 Percentage passing N° 40 seive = 80 Percentage passing N° 200 seive = 71 The liquid limit = 102% The Plasticity index = 68% The water content is = 72%Give its consistency index. Indicate the activity of this soil and numerous some potential problems linked to its use in different geotechnical works. EXERCICE 4 Some tests were performed on the sandy silt according to Standard Proctor test. The volume of the mold is 944 cm. The specific gravity was measured as 2.67 1) Plot the Proctor compaction curve (see the page 2) 2) Find: 2-1 The maximum dry unit weight of sandy-silt fill, 2-2 Its OMC, 2-3 The moisture ranges for 85% of Standard Proctor Optimum, 2-4 The degree of saturation at the optimum Proctor state. 3) Plot the zero air voids curve (see the page 2) 4) Determine the values of degree of…arrow_forward
- Q1: A. Answer in True or False 1. A soil has a Cu =1, then it is considered as a poorly graded soll. 2. A soil has L.L-60% and P.L-35%, then it plots a point below the A-line in the plasticity car 3. A soil described with a symbol (SP) has % passing No. 200 sieve more than 50% 4. Decreasing water content below shrinkage limit is accompanied with a decreasing in void ra 5. Water molecules are considered polar and known as dipoles. 6. Dry Density is the smallest density. 7. Capillary rise is directly proportional to the pore channel diameter. 8. The unconfined compressive strength is twice the undrained cohesion. 9. Piping or boiling occurs when effective stress equals to zero. 10. It is assumed that the secondary compression begins when the primary consoarrow_forwardPlot sieve size (x-axis) against % finer. Calculate for D60mm, D30mm and D10mm. Find the percentage of gravel, sand and fines. Find the CU (Coefficient of uniformity) and CC (coefficient of curvature). How does the particle size distribution of granular materials affect the properties of soil such as bulk density, permeability, and physical stability? Note the following: = D60/D10 and CC= D302 /D60 ×D10 See attached picture for informationarrow_forward5.5 The modified Proctor test (ASTM D 698, method C) was performed for a soil with G, = 2.70, and the results are as follows: Moist Weight Content, % in Mold, gf Water 6.5 3250 9.3 3826 12.6 4293 14.9 4362 17.2 4035 18.6 3685 (a) Plot the Ya versus w relation. (b) Determine Ya,max and wopt- (c) Calculate S and e at the maximum dry unit weight point.arrow_forward
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