a. VA granular soil has a saturated unit weight of 18.0 kN/m³ and an effective angle of shearingresistance of 30°. A slope is to be made of this material. If the factor of safety is to be 1.25,determine the safe angle of the slope: (i) when the slope is dry and (ii) if seepage occurs atand parallel to the surface of the slope.b. The factor of safety of a clay slope and the indicated slip circle shown in Figure Qu. 5 isconsidered inadequate. In order to increase the factor, the slope is to be altered by removingthe shaded part of the slope. Determine the percentage increase in the factor of safety after3 of 6this alteration. It is known that: Area of section before alteration = 38.7 m²; Centroid of theentire section is at G; soil density is 1885 kg/m³; cu = 20 kN/m².9m radius903.3mTo beremovedGm1.5m3m3.2m45o Ou5

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Answered: a. VÀ granular soil has a saturated…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Q- To provide safety against piping failure, with a factor of safety of 5, what should be the maximum permissible exist gradient for soil with specific gravity of 2.5 and porosity n=0.35?
A granular soil has Yeat = 18 kN/m³ and o' = 32°. An infinite slope is required to be made from %3D this material. If seepage occurs parallel to the surface of the slope and factor of safety of 1.5 is needed against slope failure then the value of safe angle of slope is degree.
The variable (falling) head of permeability test is used for permeable soils (K< 10-4 cm/s). * Ture Fulse
Given the following SPT result, determine the N-value and the soil’s relative density (No correction due to the effective overburden pressure is required). Cumulative Depth (in.) Number of Blows 6 5 12 6 18 7 Which of the following is incorrect regarding the Soil Classification Systems?a. The AASHTO Soil Classification System is commonly used in highway design and construction b. In the USCS, SP stands for Poorly Graded Sandc. Both AASHTO and USCS, percent passing #200 sieve is a crucial piece of informationd. Percent passing #4 sieve is required in order to use the AASHTO system
Loose granular soils are not very loadable. True False
(1b) Estimate the settlement of a 10 m square area loaded 1 m at 100 kN/ m3 placed 1 m below ground level with ground water at the level of the footing. The static cone resistance values for the sand deposit are as follows: G.L to 6 m = 8000kN/m3,6 -11 mm = 10,000kN/, below 11 m =12,000kN/m3.
differentiate between saturated and unsaturated flow in soils
A soil profile consists of 3m of clean sand (γ=18kN/m³) over 10m of silt (γ=17kN/m³, kv=1 x 10-8m/s) over 12m of clay (γ=17kN/m³, kv=4 x 10-9m/s) over gravel. Piezometers installed at middepth of the sult later and at the top of the gravel layer measure, respectively, piezometric heads of 4m and 3m. Assuming one-dimensional flow in the vertical direction, compute the flow rate in m³/year/10,000m². Also, compute at 16m below the ground surface the total veritcal stress, effective stress, and porewater pressure.
1. A permeable soll layer is underloin by animpervi ous loyer as shown With k-53x10^-3cm/sec for the permeable layer, calculate the rate of seepage through it in m^3/hr/m width if H=3m and a = 8 C
A 1.25 m layer of soil having the porosity 0.35 and specific gravity 2.65 is subjected to an upward seepage head of 1.85 m. What depth of coarse sand would be required above the existing soil to provide a factor of safety of 2 against piping? Assume that coarse sand has the same porosity and specific gravity as the soil and there is negligible head loss in sand.
A 650-kN column load is supported on a 1.5 m wide by 2.0 m long by 0.5 m deep spread foot-ing. The soil below is a well-graded, normally consolidated sand with g = 18.0 kN/m3 and the following SPT N60 values:Depth (m) 1.0 2.0 3.0 4.0 5.0N60 12 13 13 8 22 The groundwater table is at a depth of 25 m. Compute settlement of the footing using the gen-eralized elastic method with Christian and Carrier’s (1978) influence factors.
A soil has the following profile with depth (sand layer over clay layer): z = 0-5 ft, Yt= 110 pcf; z = 5-40 ft, Y = 119 pcf. The water table is at a depth of 5 ft. Note: for sand layer (0-5 ft), w = 5.5%, G, = 2.65; K, = 0.30; for clay layer (5-40 ft), PI = 42%, S = 100%; K. = 0.67. The horizontal effective stress at 22 ft into the clay layer is (ignore capillary pressures in the sand) is most nearly %3D %3D

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