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 17, Problem 17.2P
To determine
Find the area ratio for each case and determine the suitability for each sampler for the given soil characterization tests.
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During a subsurface exploration, an undisturbed soil sample was collected in the field using a split-spoon sampler. for laboratory evaluation. The sample has a diameter of 1.375 in. diameter, 18 in. length, and a wet weight of 1.85 lb. If the oven-dried weight was 1.5 lb and Gs = 2.74; calculate the following:(a) Wet unit weight.b) Moisture content.c) Dry unit weight.d) Void ratio.e) Degree of saturation.
during a subsurface exploration, an undiscovered soil sample was collected from the field using a split spoon sampler for lab evaluation. the sample has a diameter of 34.9mm length of 457.2mm and a moist mass of 840g. if the oven dried mass was 680g and Gs= 2.74 calculate the ff.
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A 20-cm long soil sample is acquired with a cylindrical tub having a 5-cm diameter. On removal from the tube, a sample weighs 525 g. After it is oven dried at 105° C for a period of 48 hours, the weight has stabilized at 503.2 g. The sample is assumed to be stabilized at this point and soil water has been removed. Compute the bulk density, porosity, water content, and water saturation.
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- During a subsurface exploration, an undisturbed soil sample was collected in the field using a split-spoon sampler.collected in the field using a split-spoon sampler for laboratory evaluation.sampler) for laboratory evaluation. The sample has a diameter of 1.375in. diameter, 18 in. length, and a wet weight of 1.85 lb. If the oven-dried weight was1.5 lb and Gs = 2.74; calculate the following:(a) Wet unit weight.b) Moisture content.c) Dry unit weight.d) Void ratio.e) Degree of saturation. Translated with www.DeepL.com/Translator (free version)arrow_forwardFUNDAMENTALS OF GEOTECHNICAL ANALYSIS A constant head permeability test is performed on soil that is 2 cm x 2 cm square, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. a) Compute the permeability based on these test conditions and results. b) A falling head test is conducted on the same soil specimen at the same time (t1 – t2 = 100 sec), and the standpipe diameter is 0.8 cm. If the average head during the test should be 18 cm, what are h1 and h2 values?arrow_forwardPlease solve A only. Subject: Geotechnical engi A sample coarse grained soil is 50mm. In diameter and 150mm long was tested in a constant-head apparatus. The soil sample was prepared at a void ratio of 1.5. The total head was kept constant at 300mm and the amount of water is collected in 4 sec. was 50cm^3. The test temperature was 22°Ca.) Compute the temperature correction factor.b.) Compute the corrected coefficient of permeability in cm/sec. c.) Compute the interstitial velocity.arrow_forward
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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?arrow_forwarda. A constant head permeability test was performed on a 30 cm2 (cross sectional area) soil sample. The length of the samples was 10 cm, and a 15 cm head difference was applied during testing. If 20 cm3 of water was collected over 2 minutes, calculate the coefficient of permeability of the soil. b. In a falling head permeability test, the head fell from 62 to 35 cm in 4 minutes. The cross sectional area of the sample is 50 cm2 and the length was 9 cm. If the area of the stand pipe was 0.6 cm2 compute the coefficient of permeability of the soil.arrow_forwardDetermine the characteristic of a soil sample if it has a liquid limit of 45%, moisture content of 25% and plastic limit of 14%arrow_forward
- Subject: Soil Mechanics Please provide a solution and diagram Boreholes reveal that a thin layer of alluvial silt exists at a depth of 50 ft below the surface of the ground. The soil above this level has an average dry unit weight of 96 lb/ft3 and an average water content of 30%. The water table is approximately at the surface. Tests on undisturbed samples give the following data: cu = 1008 lb/ft2, undrained friction angle = 13°, cd = 861 lb/ft2, drained friction angle = 23°. Estimate the shearing resistance in psf of the silt on a horizontal plane when the shear stress builds up slowly a. 3120 b. 861 c. 2185 d. 2449arrow_forwardFor a given soil sample, n= 0.43 and G₁ = 2.66. Calculate the dry unit weight and degree of saturation. Show complete solutions.arrow_forwardA 50 mm diameter and 90 mm-long silty clay sample was subjected to a falling head permeameter test using a setup similar to the one shown in Figure 6.4b, where the inner diameter of the standpipe was 3.0 mm. The head dropped from 870 mm to 450 mm in 5 minutes. What is the permeability of the sample?arrow_forward
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