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 17.12P
To determine
Find the type of soil within a distance of 2B footing.
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A 1.8 m square, 2 m deep footing supports a service load of 570 kN. It is supported on a clayeysand. A dilatometer test run at the site has returned the following modulus profile.Depth (m) 2 3 4 5 6 7 8 9 10 11 12M (MPa) 7.7 8.8 10.2 14.8 15.4 10.8 11.6 11.6 13.1 13.8 13.4Compute the footing settlement.
Use the stress-strain curve, where shear stress and strain response are obtained at different vertical effective stresses (100 kPa to 1400 kPa). Determine the Cohesion (c) of the soil in kPa.
Hint: Use Mohr Columb Failure criteria.
For the above stress-strain graph, Determine the friction angle.
A triaxial test was performed on a dry, cohesionless soil under a confining pressure (?3) of 144 kN/m2. If the sample failed when the deviator stress (∆?) reached 395.8 kN/m2, determine the soil’s angle of internal friction ∅ and the angle of the failure plane θ. Show step by step hand calculation. Show all work.
Chapter 17 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- Refer to Problem 17.7 and Figure 17.16. Suppose a footing (1.5 m 1.5 m) is constructed at a depth of 1 m. a. Estimate the design values for N60 and . b. What is the net allowable load that the footing can carry? The maximum allowable 17.7 settlement is 25 mm. Use Eqs. (16.56) and (16.61). Refer to the boring log shown in Figure 17.16. Estimate the average drained friction angle, , using the Kulhawy and Mayne correlation [Eq. (17.24)]. Assume pa 100 kN/m2. Figure 17.16arrow_forwardA soil excavation was done until 4m below the surface of the soil. It was identified that the shallow ground water level is 2m below the ground level and the upper is dry. The properties of the soil are: Gs = 2.7, e = 0.50, and ϕ’ = 30degrees. Assuming no seepage. What is the value of the in-situ soil’s unit weight above G.W.T. in kN/m3? What is the maximum neutral stress at the deepest point of excavation in kPa? What is the value of the total stress of soil at the surface of the ground water table in kPa? What is the value of the effective stress at the deepest point of excavation in kPa?arrow_forwardWhy SPT ‘N’ values recorded in sand at different depths arecorrected for overburden and submergence? How these corrections are applied?arrow_forward
- A 3 m 4 m footing, founded at 2 m depth in a clay, applies a net pressure of 200 kN/m2. The bed rock lies 10 m below the footing. The modulus of elasticity of the clay is 30 MN/m2. Using Janbus generalized relationship [Eq. (17.1)], assuming undrained conditions and flexible footing carrying uniform pressure, estimate the expected settlement.arrow_forwardA cut slope in soft clay has been constructed as part of a road alignment. The slope is 21.8 degrees and 10 m high. The unit weight of the soft clay is 18kN/m3. (i) A walk over survey recently indicated signs of instability. Samples have been collected from the slope and the drained analysis parameters for the soil have been determined as follows: Soil properties: φ'= 24 º, c'=2.5kPa, γd=19kN/m3 , γsat=20kN/m3 Based on the effective stress parameters given, perform a quick initial estimate of the factor of safety of this slope using Bishop and Morgernsterns charts. Assume an average pore water pressure ratio (ru) of 0.3 for the slopearrow_forwardWhat 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 PenetrationTestsarrow_forward
- The 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_forwardplz, solve what you have been asked in this problem, plz, solve all the parts of the problem? Geotechnical Engineering-2 1. In a consolidated drained triaxial test, a specimen of saturated sand failed under an deviator stress of 250 kN/m2, when the cell pressure was 100 kN/m2 i)Solve for the shear stress on the failure plane and maximum shear stress at failure? ii)Solve for factor of safety with respect to shear strength on the plane of maximum shear stress? ii) Illustrate by drawing the Mohr circle for the failure stress condition. iv)Solve for ɸ′ and the theoretical inclination of the failure plane to the horizontal.arrow_forwardWhat are the four different methods used to evaluate the potential for liquefaction of soil? Explain each briefly. 1. Evaluating the Liquefaction Potential by Standard Penetration Tests 2. Evaluating the Liquefaction Potential by Cone Penetration Tests 3. Evaluating the Liquefaction Potential by Shear Wave Velocity 4. Evaluating the Liquefaction Potential by Becker Penetration Tests I have given the 4 methods, just please explain thisarrow_forward
- From 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_forwardCone penetrometer soundings were used for the subsurface investigation of a planned construction site. At one sounding location, the value recorded for qc at a depth of 8 m was 8,000 kPa. The soil has a unit weight of 16 kN/m3. Using criteria that relate CPTresults and the soil angle of internal friction, estimate the value of f for the sand at the test depth.arrow_forwardAccording to the drilling works carried out on an area, 50 meters thick clay and an underlying rock mass were found. The groundwater level was measured to be 5 meters deepfrom the surface. As a result of the experiments, the effective cohesion and internal friction angle of the clay is 20 kPa and 25°, respectively. The dry and saturated unit weight was found to be 18 kN/m3 and 20 kN/m3, respectively. Calculate the effective vertical stress and the shear stress at a depth of 20 meters based on the information givenarrow_forward
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