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 17.13P
To determine
Find the average of
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A 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?
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.
A 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 slope
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 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_forwardThe soil arrangement shown carries 1.96-meter square footing with a column load of 552 kN. Properties of sand: Above water table = 17.44 kN/m3, Below water table = 18.23 kN/m3. Properties of clay: 17.54 kN/m3, Cc = 0.370, void ratio = 0.50. Use H1 = 6 m., H2 = 5 m., H3 = 7 m., Df = 1 m. Determine the settlement of the normally consolidated clay in mm.arrow_forward
- A site is underlain by a soil that has a unit weight of 18.7 kN/m3above the groundwater table and 19.9 kN/m3below. The groundwater table is located at a depth of 3.5 m below the ground surface. Compute the a) total vertical stress, b) pore water pressure, and c) effective vertical stress at the following depths below the ground surface: 2.2 m (Point A), 4.0 m (Point B), 6.0 m (Point C), d) draw a sketch and show the points( A, B, C) on the sketch.arrow_forwardA 2.5m thick clay is to support a footing as shown below. Assume that the pressure increase Ao' is averaged at the middle of the clay layer. Determine the consolidation settlement using 1. Boussinesq equation 2. 1:2 Methodarrow_forwardWhy is the passive soil pressure coefficient greater than 1?arrow_forward
- The soil arrangement shown carries 1.76 meter square footing with a column load of 583 kN. properties of sand: Above water table = 17.54 kN/m3, below water table = 18.51 kN/m3. Properties of clay: 17.03 kN/m3, Cc = 0.382, void ratio = 0.65. Use H1 = 6m, H2= 4m, H3 = 4m, Df = 1m. Determine the settlement of the normally consolidated clay in mm. Round off to three decimal places.arrow_forwardSoil Mechanics An embankment consists of clay fill for which c′ = 25 kN/m2 and φ = 27° (from consolidated undrained tests with pore-pressure measurement). The average bulk unit-weight of the fill is 2 Mg/m3. Estimate the shear-strength in kPa of the material on a horizontal plane at a point 20 m below the surface of the embankment, if the pore pressure at this point is 180 kN/m2 as shown by a piezometer. a. 133 b. 100 c. 166 d. 200arrow_forwardA square footing of dimension 1.5m x 1.5m carries a load of 890 kN as shown in the image: Determine the following: (d) primary settlement for normally consolidated clay using exact equation for additional pressure at midpoint of clay. (e) primary settlement for normally consolidated clay using approximate equation for additional pressure at midpoint of clay.arrow_forward
- Assume that the void ratio variation with respect to pressure relationship shown in Figure 4(a)is representative of the clay shown in Figure 4(b ). Determine the settlement in the clay layerunder the centre of footing. Assume, specific gravity G = 2. 7.arrow_forwardA 1.5 m square footing carries a column with a service load of 105 kN. It is founded at a depthof 2 m on a medium stiff clay with an undrained shear strength of 42 kPa, an overconsolidationratio of 4, and a plasticity index of 35. The clay layer is 5 m thick and overlies a very stiff shale.Estimate the undrained settlement of the footing using the generalized elastic method withChristian and Carrier’s (1978) influence factors.arrow_forwardWhat is the active pressure coefficient for a soil with 28˚ angle of internal friction and cohesion of 20 kPa? What will be the effect if the cohesion is decreased to 5 kPa?arrow_forward
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