An excavation of 10 m in soft clay is shown in the figure.Assuming the last level of strut is at GL-7.0 m, calculate thefactor of safety against inward yielding using the given soilproperties.10.0mGL-7.0m10.0m5.0m0.5m.9s 15 kPaSoft clay 1:Yt=20 kN/m³Cu=30kPaQu=0°Silty clay 2:Yt=20 kN/m³C₁ =90kPaQu=0°Bed Rock

Answered: An excavation of 10 m in soft clay is…

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter13: Slope Stability

Section: Chapter Questions

Problem 13.12P

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A rectangular channel 5.8 m wide by 1.4 m deep was laid to have a hydraulic slope of 0.001. Using n = 0.013. 1. What is its yield in cubic meter per second? 2. What savings in earth excavation could be realized by using most economical proportion? 3. What savings in lining per meter length could be realized by using most economical proportion?
5. Saturated silty clay encountered in a deep excavation is found to have a water content of 28%. Determine unit weight of the clay in kN/m3. Assume Gs=2.7
1. Side slopes for rock fill 1V:2H. Calculate the minimum crest width of a breakwater using B = 3*kΔ*(W/γa)1/3 . Given data: Stone weight = (8) t, Specific weight = 2,7 t/m3, Layer thickness coefficient =1,00 and Porosity percentage = 37 2. For cubed shaped stone (or concrete), determine dimension of the stone for weight: W = (10+a) t, specific weight: γa = 2,4 t/m3
In the excavation of a certain foundation pit, draining water causes upward seepage. The water head difference is 60cm, the length of water flow through the soil is 50cm, the saturated unit weight y=20.5 kN/m². Determine whether the heaving sand happens or not. Give the reason if happens or not
The following is a sketch of the proposed embankment, calculate the addition of vertical stress (Bousinesq method / graph below) at the depths of points A and B. Assume the unit weight of the soil stockpile = 20 kN / m3.
An embankment consists of clay fill for which c=25 kPa and angle of internal friction is 260 9from consolidated undrained test with pore pressure measurement) The weight of fill per unit volume is 18.64 kN/m3. Compute the stress in kPa at depth of 20 m. Show free body diagram a.21.6 b.372.8 c.192.8 d.62.5
(a) A pit of 6.4 m deep is to be excavated in a fine sand stratum completely saturated up to the ground surface. The saturated unit weight of the sand was obtained as 20.3 kN/m3. To stabilize the bottom of the excavation (pr o stabilize the bottom of the excavation (prevent boiling), it was decided to drive steel sheet piles to act as cutoff walls that encircle the excavation. decided to drive steel sheet piles to act as cutoff walls that encircle the excavation. Determine the total length of sheet pile wall to provide a factor of safety of 1.5 against sand boiling. Assume specific gravity of soil, against sand boiling. Assume specific gravity of soil, Gs= 2.7 and unit weight of water, γw = 9.81 kN/m3
A wide excavation is made on a site which has the following soil conditions: 0-2 m Gravel: gsat = 21.8 kN/m3, gdry = 18.5 kN/m3 2-6 m Silty sand: gsat = 19.6 kN/m3, gdry = 18.4 kN/m3 6-21 m Heavy Clay: gt = 20 kN/m3 21 m and below: PERVIOUS sandstone The water table is at a depth of 1.5 m below the ground level. The piezometric pressure head at the top of the pervious sandstone is 5 m above the ground surface. If an excavation of depth 10 m is required, and a factor of safety of 1.5 against heave at the bottom of the clay layer is set, calculate the pressure head reduction required in sandstone.
An embankment consists of clay fill for which c=25 kPa and angle of internal friction is 260 9from consolidated undrained test with pore pressure measurement) The weight of fill per unit volume is 18.64 kN/m3. Compute the stress in kPa at depth of 20 m. a. 192.8 b. 62.5 c. 21.6 d. 372.8
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?
1. The following is a sketch of the proposed embankment, calculate the addition of vertical stress (Bousinesq method / graph below) at the depths of points A and B. Assume the unit weight of the soil stockpile = 20 kN / m3. 2. Calculate the added vertical stress at points A and B as deep as Z = 8 m, under the rectangular load
. A triangular fill with dimensions as shown below is piled on the slope. The shear strength parameters of the plane between the fill material and the slope were determined as 12 kPa and 25°. Since the unit weight of the fill is 18.5 kN/m3, calculate the factor of safety against sliding.

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