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A rectangular footing which has 6m x 8m dimensions and carrying 250 kN/m2 is located at a depth of 3m in a deposit of clay which has 27 m thick. The coefficient of volume compressibility is 4x10-4 m2/kN at the ground surface and the reduction in the coefficient of volume compressibility with depth equals depth*0.1*10-4 m2/kN. The ground water level is at the ground surface and the unit weight of soil is 18 kN/m3.
a) Determine the consolidation settlement of the clay by dividing the clay layer into four sub-layers (use the approximate method for calculating the increase in stress [at various depths] due to applying the surface load).
b) Find the average degree of consolidation when the soil settlement is 10 cm.
c) Find the pore water pressure at 12 m depth of clay when the degree of consolidation at that depth is 30%.
d) If the uniform coefficient of consolidation of the clay layer is 7.3 m2/year, find the necessary time to reach 50% consolidation for this layer with the assumption of two-way drainage.
In a study it was found that 39% of the bacteria died within 9 hoursand 67% died within 20 hours. If the rate of andwer proportional to the number remaining, how long would it take to obtain a 99.9% reduction in the bacteria
Find the velocity of the air downstream of the restriction, and show that the enthalpy is essentially the same before and after the throttling process. Also find the change of entropy.
A train of total mass equal to 500 Megagrams starts from rest and accelerates uniformly to a speed of 90 km/h in 50 s. After reaching this speed, the train travels with a constant velocity.
The ultimate normal strength of the wood is ?ult = 1800 psi and the ultimate shear strength of the wood is fault = 800 psi. The width of the specimen under tension is b = 1.7 in, and the specimen is 1.0 in thick.
what are the factors affecting the hydraulic conductivity?
Hardness is sum of all divalent cations (meaning all species with a positive charge of 2) in a water sample. Magnesium (Mg2+) and calcium (Ca2+) are the most common divalent cations that contribute to hardness.
A Fe-.25 w/o Carbon alloy is sloly cooled to 700 degrees C. What is the composition of the Ferrite(alfa) phase and what is the compositon of the cementite(Fe3C) phase. Whate are the relative fractions of ferrite and cementite
using the principles to developed in chapter 3 on equilibrium, one can determine that the tension in cable AB is 143.4 N. Determine the moment about the x-axis of this tension force acting on point A.
what are the specifications need to be specified while creating a design for waterways. what are their uses. how are they maintained.
a level test track has a coefficient of road adhesion of 0.80, and a car being tested has a coefficient of rolling friction that is approximated as 0.018 for all speeds. the vehicle is tested unloaded and achieves the theoretical minimum stop in 1..
An investor has invested $250,000 in a new rental property. Her estimated annual costas are $6,000 and annual revenues are $20,000. What rate of return per year will the investor make over a 30-year period ignoring the salvage value
An oedometer test on a clay soil gave the following results: Cc = 0.4, Ce = 0.08, OCR = 5. The thickness of the clay layer in the field is 2.6 m. The existing vertical effective stress at the mid-depth of the clay layer is 150 kPa.
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