Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 17, Problem 22P
To determine
The depths of the different strata of soil and the type of soil in each stratum.
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A plate-bearing test is performed on soil near the surface of a granular stratum in order to determine the modulus of vertical subgrade reaction. The load versus settlement information appears as a straight line on a graphical plot. At a point where the load is 5 tons/ft2, the indicated settlement is 0.5 in. What is the value for the modulus of vertical subgrade reaction?
What are the four different methods used to evaluate the potential for liquefaction of soil? Explain each briefly.
1. Evaluating the LiquefactionPotential by Standard PenetrationTests2. Evaluating the LiquefactionPotential by Cone PenetrationTests3. Evaluating the LiquefactionPotential by Shear Wave Velocity4. Evaluating the LiquefactionPotential by Becker PenetrationTests
Subject: Soil Mechanics
Please provide a solution and a diagram.
A cylindrical sample of soil having a cohesion of 80 kN/m2 and an angle of internal friction of 20°is subjected to a cell pressure of 100 kN/m2. Determine the maximum deviator stress at which the sample will fail in kPa.
a. 333
b. 387
c. 255
d. 246
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- Question 5An earth dam is proposed for a site consisting of a homogeneous stiff clay, as shown in the Fig. below. You, the geotechnical engineer, are required to specify soil strength tests to determine the stability of the dam. One of the critical situations is the possible failure of the dam by a rotational slip plane in the stiff clay. What laboratory strength tests would you specify and why?Question 5 An earth dam is proposed for a site consisting of a homogeneous stiff clay, as shown in the Fig. below. You, the geotechnical engineer, are required to specify soil strength tests to determine the stability of the dam. One of the critical situations is the possible failure of the dam by a rotational slip plane in the stiff clay. What laboratory strength tests would you specify and why?arrow_forwardWhat do mean by liquefaction and cyclic mobility Explain in details? What types of soils are susceptible to liquefaction? What are effects of earthquake related liquefaction of geotechnical structures. Show the cyclic mobility in dense sand at larger confining pressure of 200 kPa with diagrams.arrow_forwardThe figure below shows a proposed site where an excavation will be made. The 12 ft layer of sand will be removed, so that the top of the 30 ft normally consolidated clay layer will be exposed (Assume that changes in GWT do not affect γt of clay). a. Assume that the water-table location remains the same during excavation. Compute the σ, σ′v, and u values at the middle of the clay layer before and after the excavation b. Assuming 1-D conditions, compute how much the clay layer will deform due to this excavation, in inches. Specify whether this is settlement or heavearrow_forward
- A soil profile is given in Figure 7.18a. The consolidation test in the laboratory was carried out to test a soil sample taken from the center of the soil layer. Interpolated field consolidation curves from experimental results in the laboratory given in Figure 7.18b. Calculate the amount of settlement that occurs as a result of primary consolidation if an embankment (surcharge) of 50 kN/m² is placed on the ground surface.arrow_forwardRegarding impact resistance, determine what energy is mobilized by rock of 150-mm size falling out of a dump truck 1.5-m to the geotextile, if the geotextile rests on the following: (a) A “soft” soil of unsoaked CBR = 3 (b) A “firm” soil of unsoaked CBR = 9 (c) A “hard” soil of unsoaked CBR = 16arrow_forwardCompute the cohesion of the clay. The results of a three consolidated undrained tri-axial tests on a saturated clay are as follows : a. 10.45 kPab. 12.25 kPac. 11.62 kPad. 15.62 kPaarrow_forward
- A laboratory sample of clay 2 cm thick took 15 min to attain 60 percent consolidation under a double drainage condition. What time (in days) will be required to attain the same degree of consolidation for a clay layer 3 m thick under the foundation of a building for a similar loading and drainage condition? a.17.15 b.119 c.234 d.564.3arrow_forwardGeotechnical Engineering The following are the results of a standard penetration test in sand. Estimate the soil friction angle at the 3.0 meter depths given N60 =7 . Note that the water table was not observed within a depth of 12 m below the ground surface. Assume that the average unit weight of sand is 15.5 kN/m3 and Pa = 100 kN/m2. a. 44.6 b. 37.6 c. 38.9 d. 34.4arrow_forwardFrom the given data determine these soil properties and analyse the results, how important are these test data and how can they be integrated within geotechnical design procedures. - If a soil sample tested in a direct shear box of 60 mm by 60 mm and the maximum readings for normal loads of 0.3, 0.5 and 1.0kN were 202, 265 and 511 kN, determine the strength parameters corresponding to effective stress.arrow_forward
- FUNDAMENTALS OF GEOTECHNICAL ANALYSIS During a Standard Penetration Test on silty clay soil, blow counts of 7, 11 & 16 were recorded for the 1st, 2nd, and 3rd, with 6-inch intervals of an 18-inch split spoon. a) What is the N value? and, b) What is the consistency of the soil?arrow_forwardPlease solve the following question: A soil sample from a slope has a saturated unit weight of 22 kN/m3 and internal friction angle of 33°. Calculate the allowable slope angle for a factor of safety of 2.5. Take the unit weight of water equal to 9.81 kN/m3.arrow_forwardWhat is the difference of the failure plan of soil sample in Triaxial Test and in Direct Shear? And the effect of this difference on the shear strength of soil ?arrow_forward
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How Are Highways Designed?; Author: Practical Engineering;https://www.youtube.com/watch?v=9XIjqdk69O4;License: Standard Youtube License