Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Textbook Question
Chapter 4, Problem 4.7QPP
Using the CPT data in Figure 4.22, a unit weight of
- Soil behavior type
-
- Consistency (based on Table 3.3)
-
-
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5.5 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.
5.5 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
in Mold, gf
Water
Content, %
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.
(d)
What is Y, at Wopt?
What is the range of water content if the relative compaction (R.C.)
is required to be 95% of the modified Proctor Ya.max?
Subject: Soil Mechanics
A. Classify the Soil Using USCS (with explanation/ justification)
Given data:
D10 = ?
D30= 0.0023mm
D60= 0.032mm
Liquid Limit= 49%
Plastic Limit= 24%
CHOICES:
a. CL (lean clay with gravel)
b. CL ( lean clay with sand)
c. ML (silt with gravel)
d. ML (Silt with sand)
Chapter 4 Solutions
Foundation Design: Principles and Practices (3rd Edition)
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- B. ( A Soil Specimen has the following characteristics: % passing No.4 sieve = 85 % passing No.200 sieve = 11 D60 = 2 mm D30 = 0.35 mm D10 = 70 μm L.L = 36% P.L = 31% D8 = 2 μm 1. Classify the specimen according to the Unified Soil Classification System (USCS). Assign the group name and the group symbol. 2. Determine the soil activity. 3. Determine the soil Liquidity index and consistency index if we = 26%. Jarrow_forwardQ.1.A A soil specimen have void ratio (e) of 0.7, Gs 2.72. Calculate the total unit weight, dry unit weight, and water content at degree of saturation equals 75%. B. Classify the following soil using the USCS. Finer (%) 100 90 60 30 19 4 Sieve No. 4 No. 25 No. 50 No. 100 No. 200 12.5 mm (Diameter) (4.7 mm) (0.7 mm) (0.3 mm) (0.15 mm) (0.075 mm)arrow_forwardFollowing are the results from the liquid and plastic limit test for a soil. No. of blows (N) Moisture Content % 16 39.5 20 36.1 28 30.0 a. Compute the liquid limit. b. Compute the plasticity index. C. Compute the liquidity index if the insitu moisture content is 26.5%. d. Compute the consistency index.arrow_forward
- The following data were obtained by conducting liquid limit and plastic limit tests on a soil collected from the site. Liquid limit tests: Number of blows, N 15 21 29 38 Moisture content (%) 39.5 37.9 36.4 35.1 Plastic limit test: PL = 19.3% a. Draw the flow curve and determine the liquid limit. b. Using the Casagrande plasticity chart (Figure 4.21), determine the soil type.arrow_forward. Problem 3- From the following data of the grain size analysis Sieve size system #4 #8 # 10 #25 #60 # 100 #200 Pan Sieve opening (mm) 4.76 2.36 2.00 0.71 0.25 0.149 0.074 Determine; a) Cu and Cc % Finer (by weight) 80 56 51 35 18 13 7 I b) classify the soil using the unified soil classificationarrow_forwardCompressibility Consolidation test is conducted to Q2 determine the consolidation properties of the soil Test Result The dial gauge reading after each load increment (24 hours) is given in the table. Specific gravity, Gs of the soil sample = 2.73 Initial sample thickness Ho = 19 mm Final water content of the sample = 19.8%. Determine the following properties : Construct compressibility curve (e vs log o') Pressure, o' Dial reading, (kN/m²) mm 25 %3D 50 24.747 %3D 100 24.493 200 24.108 а. 400 23.449 800 22.608 b. Coefficient of compressibility a, 1600 21.676 Coefficient of volume compressibility, m, С. 3200 20.737 Compression index, C. (between 400 and d. 21.48 3200 kPa)arrow_forward
- The following are results from the liquid and plastic limit test for a soil. No. of blows (N) Moisture content (%) 15 42 20 40.8 28 39.1 The plastic limit is 18.7%. 1. Compute the liquid limit using table. 2. What is the plasticity index of the soil. 3. What is the liquidity index if the water content is 24%. 4. What is the consistency index.arrow_forwardHomework 1-Results from liquid and plastic limit tests conducted on a soil are Moisture given below. Plastic limit tests: PL 13.4% a) Draw the flow curve and obtain the liquid limit. b) What is the plasticity index of the soil? C) Determine the liquidity index of the soil if Win situ = 32% Number of blows, N content (%) 39.2 %3D 15 34.5 22 26 31.2 29.0 %3D 29 U.S. sieve no. Mass of soil retained 1- The followiarrow_forwardClassify the soil using AASHTO. The liquid limit and plastic limit are found to be 30 and 20, respectively. The following data are obtained: Percent passing No. 4 sieve: 100% Percent passing No. 10 sieve: 91% Percent passing No. 40 sieve: 60% Percent passing No. 200 sieve: 20%arrow_forward
- Calculate the CEC (m.e./100g soil) using the following given miliequivalent weights obtained from a 25g soil sample (a. Ca++= 2.23 m.e; b. Mg++=1.32 m.e.; c. Na+= 1.98 m.e.; d. K+= 1.87 m.e.; e. H+= 1.27 m.e.; f. Al+++= 0.11 m.e.; g. NH4+= 2.3 m.e.; h. NO3-= 1.5 m.e.arrow_forward4. Phase Diagram A soil sample was obtained at the underground parking garage that Dr. Barry is constructing at his home with a volume (VT) of 0.05 ft', total weight (WT) of 4.2 lbs, weight of water (Ww) of 0.37 lbs and a specific gravity (Gs) 2.70. Draw a complete phase diagram and determine the void ratio (e), moist unit weight (y), saturated unit weight (ysat), dry unit weight (Yary), weight of the solids (W.), volume occupied by the solids (V.), volume occupied by the water (V), volume occupied by the air (VA). volume of the voids (Vv), porosity (n), moisture content (w), and percent saturation (S). Use English units in your solution. Show all of your work.arrow_forwardProblem Set 4 4. The following data were obtained from the liquid and plastic limit tests for a soil: Liquid Limit Test: Number of blows (N) Molsture content (%) a) Draw the flow curve from the liquid limit test data and find the liquid limit. (use excel to graph) b) What is the plasticity index of 17 42.1 22 38.2 27 36.2 32 34.1 Plastic Limit Test: Moisture content = 21.3% the soil?arrow_forward
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