8. a. Moist sand having a unit weight of 18.60 kN/m' is to be excavated to a depth of 5 m to acco...
The bed of a lake consists of a deposit of silty sand with a wet unit weight of 19 (kN/m3) and a coefficient of permeability of 103 (m/sec). The depth of water in the lake is 6 m. It is known that water is seeping vertically upwards through the silty sand from an underlying aquifer. a) At what rate, in per square meter of the lake bed, must water flow upwards to cause a quick condition in the silty sand?...
A stockpile of soil (of unit weight = 18 kN/m3) is to
be stored on a level site. The length of the stockpile is to be
considered as infinite with the width and height equal to A = 7 m,
B = 5 m and H = 7 m, as per the figure shown below. Calculate the
increase in vertical stress (in kPa) due to the loading created by
the stockpile at point A, which is located at depth Z...
A retaining wall is to be constructed in a normally consolidated clayey sand deposit in the figure below. Ground water table is lmbelow the bottom of the excavation. A 20 kN/m2 surcharge pressure is applied over a wide area at the ground surface. Assume the wall moves into the excavation. Consider long-tem analysis (as it is usually the more critical analysis in excavation problems). Ignore capillarity as shown 20 kPa Clayey sand T17 kNm Y-20 kNm 5 m c'-10 kPa...