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A 10-m-thick, water-bearing sand layer (permeable), called an aquifer, is sandwiched between a 6-m clay layer (impermeable) at the top and bedrock (impermeable) at the bottom. The groundwater level is at the ground surface. An open pipe is placed at the top of the sand layer. Water in the pipe rises to a height of 5 m above the groundwater level. The water contents of the clay and sand are 52% and 8%, respectively.
(a) Does an artesian condition exist? Why?
(b) Plot the distribution of vertical total and effective stresses, and pore water pressure with depth up to a depth of 10 m.
(c) If Ko of the clay is 0.5 and Ko of the sand is 0.45, plot the distribution of lateral total and effective stresses.
(d) An invert (surface of the bottom arc) level of 4 m from the ground surface is proposed for a water pipe 2 m in diameter. Draw the soil profile and locate the water pipe. Explain any issue (justify with calculations) with locating the water pipe at the proposed invert level.
Three cables (AD, BD and CD) are used to hang a circular disc. The radius of the disc is 50 cm and it has a weight of 500 N. Draw a free body diagram and determine the force in each of the cables, AD, BD and CD using vector analysis. Write these f..
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List down two methods used in analysis of structures in civil engineering
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The article "Leachate from Land Disposal Residential Construction Waste" (authored by W.J. Weber, Y.-C Jang, T.G. Townsend, and S. Laux, Journal of Environmental Engineering, 128(3): 237 - 245, 2002) presents a study on contamination
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The mean grade on a final examination was 72, and the standard deviation was 9. The top 10% of the students are to receive A's. What is the minimum grade a student must get in order to receive an A ?
Total stress analysis is usually preferred for construction of embankments and for excavations, we use effective stress analysis, but why? Total stress is Undrained strength of the soil
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A hot-rolled 7-mm-diameter steel rod is axially loaded at room Temp under a fully reversed cyclic loading. under the rotating beam test, the endurance limit for this steel is 470 MPA, under static loading the ultimate strenght is 1200 MPA.
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