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A borehole at a site reveals a soil profile comprising 6 m deep fine sand layer overlying a 9 m thick clay layer, which in turn overlies weathered bedrock. The groundwater table is located at a depth of 4 m from the ground surface. A zone of capillary saturation exists in the fine sand layer above the groundwater table. Above the zone of capillary saturation, the fine sand layer can be considered to be dry. The air entry value (AEV) for fine sand layer is 15 kPa and its specific gravity (Gs) and porosity (n) are 2.65 and 0.315, respectively. The natural water content (w) and void ratio (e) of the clay layer are 28.5% and 0.7, respectively. The unit weight of water (γw) is equal to10 kN/m3
a. At what depth from the ground surface is the top of the capillary saturation zone located?
b. Calculate and plot the distribution of total and effective vertical stresses as well as pore-water pressure with depth from the ground surface up to the bedrock surface.
A stone A is dropped from rest down a well, and in 1 second another stone B is dropped from rest. Determine the distance between the stones another second later.
Two level sections of an east highway (G=0) are to be connected. Currently, the two sections of highway are seperated by a 4000-ft (horizontal distance), 2% grade.
What is the alkali-aggregate reaction? List some of the rock types that are vulnerable to attack by alkaline solutions. Discuss the effect of aggregate size on the phenomenon.
The base line vector between the base and roving reciever is 8340m and has an accuracy of +/-(1to 2 cm +/-2ppm). What is the estimated uncertainty in the length of this vector
A three-span continuous beam ABCD with three equal spans supports a uniform load with intensity q. Determine all reactions of this beam and draw the shear force and bending moment diagrams labelling all critical ordinates.
A sample of mortar fills a900 ml beaker. The mortar and beaker combined weighs 3 lb and the empty beaker weighs 2 oz. What is the weight density of this mortar sample?
determine the horizontal spacing of the vertical drains if the drains are installed in triangular grid to reach 90% of primary consolidation in 1.5 years after the commencement of fill placement
An object of density P_a, volume V_a, and weight W_a is thrown from a rowboat floating on the surface of a small pond and sinks to the bottom.
The herbicide 2,4,D, is applied to a golf course at a rate of 1.2 kg/ha. The organic matter content of the soil is 1%, bulk density is 1.3 g/cm3, and water content is 0.3. a) What fraction of the herbicide is adsorbed, and what fraction is dissolve..
To avoid the salinization of soil in a farming area, parallel drainage canals are to be installed to maintain the water table at a depth of at least 4m below the ground surface. It is thought that no evapo-transpiration would occur below that dept..
A supertanker has length, breath, and draught (fully loaded) dimensions of 325m, 48m, and19m, respectively. In open seas the tanker normally operates at a speed of 115 kt (1 kt=0.515m/s).
The two shafts in a speed-reducer unit are subjected to couples of magnitude M1 = 18 N · m and M2 = 7.5 N · m, respectively. Replace the two couples with a single equivalent couple, specifying its magnitude and the direction of its axis.
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