You are given the following results from Atterberg Limit testing on a soil sample (PL = 20%, LL = 58%) collected from a boring on a local project site. What is the USCS group symbol for this soil? (Refer Fig. B and USCS) e.g OL PLASTICITY INDEX (PI) 60 50 40 30 20 10 0 CASAGRANDE CHART For classification of fine-grained soils and fine-grained fraction of coarse grained soils. 10 CL or OL 20 "/wis. PLASS -LINE: POSLL-8) ML or OL 30 40 50 GO LIQUID LIMIT (LL) A-LINE PITALL-20) CH or OH Figure B: Atterberg chart MH or OH 70 80 Comple Sample 2 90 100

You are given the following results from Atterberg Limit testing on a soil sample (PL = 20%, LL = 58%) collected from a boring on a local project site. What is the USCS group symbol for this soil? (Refer Fig. B and USCS) e.g OL PLASTICITY INDEX (PI) 60 50 40 30 20 10 0 CASAGRANDE CHART For classification of fine-grained soils and fine-grained fraction of coarse grained soils. 10 CL or OL 20 "/wis. PLASS -LINE: POSLL-8) ML or OL 30 40 50 GO LIQUID LIMIT (LL) A-LINE PITALL-20) CH or OH Figure B: Atterberg chart MH or OH 70 80 Comple Sample 2 90 100

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter4: Plasticity And Structure Of Soil

Section: Chapter Questions

Problem 4.5P: The following data were obtained by conducting liquid limit and plastic limit tests on a soil...

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Since laboratory or field experiments are generally expensive and time consuming, geotechnical engineers often have to rely on empirical relationships to predict design parameters. Section 6.6 presents such relationships for predicting optimum moisture content and maximum dry unit weight. Let us use some of these equations and compare our results with known experimental data. The following table presents the results from laboratory compaction tests conducted on a wide range of fine-grained soils using various compactive efforts (E). Based on the soil data given in the table, determine the optimum moisture content and maximum dry unit weight using the empirical relationships presented in Section 6.6. a. Use the Osman et al. (2008) method [Eqs. (6.15) through (6.18)]. b. Use the Gurtug and Sridharan (2004) method [Eqs. (6.13) and (6.14)]. c. Use the Matteo et al. (2009) method [Eqs. (6.19) and (6.20)]. d. Plot the calculated wopt against the experimental wopt, and the calculated d(max) with the experimental d(max). Draw a 45 line of equality on each plot. e. Comment on the predictive capabilities of various methods. What can you say about the inherent nature of empirical models?
1. Why will bulk density vary between soils but it is valid to use a constant value for particle density (2.65 g cm-3)?
PROBLEM E Classify the following samples using USCS Method of Soil Classification. Determine the ff: 1. Coef. of Uniformity 2. Coef. of Curvature 3. Soil Classification
Undisturbed soil obtained from a test pit 0.0283 m3 (1 ft3) in volume is found to have a wet weight of 0.459 kN (103.2 lb). The dry weight of the sample is 0.376 kN (84.5 lb). What would be the effective unit weight of such a soil if it were submerged below the groundwater table? The specific gravity of the soil is determined to be 2.70.
What is the significance of large or small California Bearing Ratio (C.B.R) value.And why is it that the C.B.R value of a soil sample changes when the sample was soaked with water?
PROBLEM D Classify the following samples using USCS Method of Soil Classification. Determine the ff: 1. Coef. of Uniformity 2. Coef. of Curvature 3. Soil Classification
Laboratory tests performed on a saturated alluvial subgrade soil gave the following information: In situ water content = 11.9%, Specific gravity = 2.65, Soil size distribution: D100 = 51 mm, D75 = 30 mm, D60 = 20 mm, D45 = 15 mm, D30 = 8 mm, D10 = 4.76 mm, D8 = 2 mm, D4 = 0.08 mm, < 2 m = 4% a. Is this soil well graded? Classify it by the AASHTO and Unified systems b. Using the sieve analysis soil data and the classification systems, estimate for a total of 100% the approximate percentages of coarse aggregate (gravel), fine aggregate (sand), silts, and clays?
A soil sample has the following size distribution; 4 to 2mm = 17%, 2 to 0.05 mm = 12%, 0.5 to 0.005 mm = 22% 0.005 to 0.002 mm = 10% <0.002 mm = 39% what are the percentages of clay, silt, and sand? Using USDA calssification what is the modifier and tetural classification
A soil sample is 15mm thick, has an original void ratio of 0.95, if the coid ratio is decreased to 1/4 of its orginal void ratio, what would be its new thickness? choices: a) 5.48mm b) 9.52 mm c) 11.35 mm d)3.65mm
Classify the soil by USCS or AASHTO The following data were reported to a soil sample:Percentage of passage of the 4.75 mm sieve = 64Percentage passing Sieve between 75 μ = 6Uniformity Coefficient = 7.5Curvature Coefficient = 2.7Plasticity index = 2.5
1. Classify the following soils using USCS givegroup symbol and group name.a) A 55% of soil sample retained in sieve no. 4and 89% retained on sieve no. 200. The soilsample has a liquid limit = 28% and plasticLimit = 18% Cu = 4.2, Cc = 1.4 2. A saturated soil has the followingcharacteristics:Initial Volume = 25 cm3Final Volume = 16 cm3Mass of wet soil = 45 gMass of dry soil = 31 ga) Determine the Shrinkage Limitb) Determine the Shrinkage Ratioc) Determine the Specific Gravity of the soil
Geotechnical Engineering Please help me answer this question, and please show your solutions write it properly. Problem 4 For a given sandy soil, the maximum and minimum void ratios are 0.72 and 0.46, respectively. If Gs= 2.71 and w=11%, what is the moist unit weight of compaction in the field if the relative density equals 82%? Problem 5 A soil sample has a unit weight of 105.7 pcf and a degree of saturation of 50% When the saturation is increased to 75%, its unit weight raises to 112.7 pcf. Determine the void ratio e and the specific gravity Gs for this soil.