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Question
a) A new building is to be built on a series of spread foundations that will be undrained by saturated clay. Undisturbed soil samples have been obtained from this site and are ready to be tested. Should the laboratory test programme focus on producing values of c' and Ø', or Su (undrained shear strength)? Explain.
B) A grain silo, which is very heavy structure, was recently built on saturated clay. Because the harvest season was fairly short and intense, the silo was completely loaded fairly quickly (i.e., within a couple of weeks). This is the first time the silo has been loaded. The grain weights about twice as much as the empty silo. The weight of this grain, along with the weight of the silo, has induced both compressive and shears stresses in the soil below.
Suddenly, someone has become concerned that the soil may be about to fail in shear under the weight of the silo and grain. This is a legitimate concern, because such failures have occurred before. Discuss the soil mechanics aspects of this situation and determine whether the risk of failure in the soil is increasing, decreasing, or remain constant with time.
A hurricane has an average rainfall of 9 in over a 200 mile^2 watershed. What is the reservoir in acre-ft that would be required to contain 20% of the rain completely
A 2000-lb wheel load is to be supported by aggregate over soil with a maximum bearing pressure of 1000 lb/sqft. What depth of aggregate is needed if the angle theta is 40 degrees?
The uniform load has a mass of 450 and is lifted using a uniform 35- strongback beam and four ropes. Determine the Tension in the ropes Determine the force that must be applied at A.
In dating using radiocarbon, the amount of C^14 remaining at the time of measurement is expresed as a percentage of modern carbon. For example that the 30% modern carbon, N/No would be 0.3
Carnot engine working between a source temperature of T2 and sink temperature of T1 has efficiency of 25%. if the sink temperature is reduced by 20 degrees Celsius the efficiency is increased to 30%. find the source and sink temperature
The maximum vertical load and horizontal load have been identified and shown in the figure. Under this loading condition, you are asked to determine the horizontal deflection of joint C.
Determine the maximum possible precipitation at New York City that may be encountered on a 100 mi^2 drainage area over a 96 hr period.
The dry density of a compacted sand is 1.87 Mg/m^3 and the density of the solids is 2.67 Mg/m^3. What is the water content of the material when saturated. Include a phase diagram.
A cylinder fitted with a piston has a volume of 2ft^3 and contains 0.5 lbm of steam at 60 psia. Heat is tranferred to the stream until the temperatureis 500 F, while the pressure remains constant
Water in a pip has a pressure of 22.1 lb/ft2. What is the pressure head?
Determine the projected component of the force fac along the axis of strut ao. Express the result as a cartesian vector.
Knowing that at t= 3s slider block C has moved 57 mm to the right, Determine the velocity of slider block C at t=0, (b) the acceleration of A and C, (c) the change in position of block A after 5s.
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