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A sample of soil taken at a depth of 5 m in a homogeneous over consolidated saturated clay was testedunder standard triaxial CU conditions. Its water content was 48%. The soil was isotropically consolidated to a mean effective stress of 50 kPa and then unloaded to a mean effective stress of 15 kPa. The peak deviatoric stress reported by the soil technician is 20 kPa. The critical state friction angle is 32°. A one-dimensional consolidation test gave the following results: Cc = 0.32, Cr = 0.06, and OCR = 6. In the field, the groundwater level is at the ground surface.
(a) Is the reported peak deviatoric stress reasonable?
(b) Is the CU test, as conducted, representative of the in situ conditions? Justify your answer.
(c) Estimate the undrained shear strength of the in situ soil sample.
Two towers A and B are located on flat ground and their bases have equal elevations above sea level. A person on tower A whose eye level is 26.0 ft above the ground can just see the top of tower B, which is 105 ft above the ground. How far apart a..
We are digging a hole to build a building. Calculate the energy needed to bring the soil to surface level. Remember the sides of the excavation lie at 45 degrees. Else, the whole would be constantly refilling itself.
The intensity of Na light passing through a gold film wasmeasured to be about 15% of the incoming light. What is thethickness of the gold film? ( λ=589 nm; k=3.2).
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A new engineer is evaluating whether to use a higher-voltage transmission line. It will cost $250,000 more initially, but it will reduce transmission losses. The optimistic, most likely, and pessimistic projections for annual savings are $20,000, $15..
Also discuss the experimental procedures you would use for the calibration of crack length and crack closure, where appropriate, for each of the above methods.
An isolated system contains an incompressible substance with heat capacity C = kT, where k is a constant. The system is initially divided in two parts, with 1/3 of the mass at T1 and 2/3 of the mass at T2.
A model is to be produced for a prototype with reynolds number similitude. The prototype and model will both be in air, if the prototype has a velocity of 500 ft/s and a diameter of 30 ft, what should the velocity for the model be if the model diamet..
standard air is drawn from the atmosphere into a 1.25 m diameter cylindrical duct by a fan mounted inside the duct. This air is discharged down stream from the fan through a 0.6 m diameter duct at a velocity of 25 m/s and atmosphere pressure.
A motorcyclist travels around a curved path that has a radius of 200 . While traveling around the curved path, the motorcyclist increases speed by 1.25 . If the motorcyclist starts from rest, determine the time needed to reach an acceleration of 5...
A horizontal curve on a two-lane highway is designed with a 818.51ft radius, 12ft lane, superelevation 6.4%, and a 50mph design speed. Deflection angle is 90 degree. The maximum relative gradient is 0.50.
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