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a) The soil profile on a site consisted of 4 m thick homogeneous clay deposit overlying an impermeable rock. The investigation results indicated that the clay had a saturated density of 1.6 Mg/m3, an average initial void ratio of 1.8 and the preconsolidation pressure at the mid depth of the clay layer was 20 kPa. A piezometer standpipe was installed at the mid depth of the clay layer. The water table always remained at the same elevation as the original ground surface. Following the site investigation, a sand fill, which was large in lateral extent, was placed on the ground surface. The height of the sand fill was 1 m and the total density of the sand fill was 2.0 Mg/m3 above and below the water table. Two years after the placement of the sand fill, the ground settlement was 30 cm and the water level in the piezometer standpipe was at 0.6 m above the water table. Ignore the buoyancy effect on the applied pressure from the sand fill in your calculation. Treat the clay as one layer; subdivisions are not required.(i) Calculate the coefficient of consolidation and the compression index of the clay. The recompression index of the clay can be taken as 10% of its compression index.(ii) Three (3) years after the placement of the sand fill, a soil sample was taken from the mid depth of the clay layer and a consolidation was performed on the sample.(ii-a) Estimate the preconsolidation pressure of the soil sample and calculate the consolidation settlement 3 years after the placement of the sand fill.(ii-b) Calculate the water level in the piezometer standpipe with respect to the water table 3 years after the placement of the sand fill.b) Briefly explain the difference between piezometer and tensiometer with respect to the working principle, special design consideration and limitation of the instrument.
A sample of natural glacial till was taken from below the groundwater table. The water content was found to be 52%. Estimate the wet density,dry density,buoyant density,porosity,and void ratio. Clearly state any necessary assumptions.
A fully loaded, ocean going container ship is just stable about its longitudinal axis (roll). The ship has a total weight of 155,000 tons, length = 1,600 feet and a beam = 150 feet (assume that it is the shape of a rectangular box). Calculate the ..
A rectangular beam made using concrete with f'c = 6000 psi and steel with fy=60000 psi has a width b= 20 in. The concrete modulus of rupture fr=530 psi.
Consider a 2D triangular element with the three vertices at 1[1,1], 2[1,2] and 3[2,2]. the displacements at these t hree points are [0.1,0.1], [0.3,0.2] and [0.4, 0.3] mm for point 1,2,and 3 respectively
The subsoil at the site is a thick layer of soft alluvial river silts and sands, the bearing capacity of the silt has been found to be in the region of 80 kN/m2. There is a high ground water table present.
A reaction of great significant for undergraduate students is the fermentation of sugar with yeast. This is a zero order (in sugar) reaction, where the yeast is a catalyst (it does not enter into the reaction itself).
Determine the discharge of a trapezoidal concrete channel section with a bottom width of 4 ft and side slopes of 2:1. The depth of flow is 5 ft and the channel slope is 0.5%
Find the concrete cross-section and steel area required for a simply supported rectangular beam with a span of 20 ft that is to carry a computed dead load of 1.3 k/ft and a service live load of 2.25 k/ft.
The 90-lb boy and 75-lb girl wald towards eachother with constant speed on a 330-lb cart with frictionless wheels. assume that the cart was at rest befor the boy and girl start walking.
Use the ideal gas law to estimate the mass of the air (in KG) contained in the room. State clearly what your approximate temperature , volume are. Molar mass of air is about 29.
Water flows through a horizotal 45 deg reducing bend with a 36 inch. diameter upstream and a 24 inch diameter downstream, at the rate of 20 cfs under a pressure of 15 psi at the upstream end of the bend. Neglecting head loss in the bend, calculate..
You are to design a chlorination tank for killing microorganisms in the effluent from a wastewater treatment plant. It is necessary to remove 99% of active bacteria in a wastewater flow of 120 m 3 /hr.
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