In May 1970, a 70 ft tall, 20 ft diameter concrete grain silo was constructed at a site in Eastern Canada (Bozozuk, 1972b). This cylindrical silo, which had a weight of 183 tons, was supported on a 3 ft wide, 4 ft deep ring foundation. The outside diameter of this foundation was 23.6 ft, and its weight was about 54 tons. There was no structural floor (in other words, the contents of the silo rested directly on the ground). The silo was then filled with grain. The exact weight of this grain is not known, but was probably about 533 tons. Unfortunately, the silo collapsed on September 30, 1970 as a result of a bearing capacity failure. The soils beneath the silo are primarily marine silty clays. using an average undrained shear strength of
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- A single anchor slab is shown in Figure P14.12. Here, H = 0.9 m, h = 0.3 m, γ = 17 kN/m3, and Φ' = 32º. Calculate the ultimate holding capacity of the anchor slab if the width B is (a) 0.3 m, (b) 0.6 m, and (c) = 0.9 m.arrow_forwardAssume that an area is underlain by a stratum of compressible soil 5.3 m thick. The weight of the proposed structure, say an earth embankment for a new highway, will result in an increase of 28.2 kPa pressure to the compressible soil. The settlement under this loading would be 0.30 m. The 385 compressible layer is doubly drained, and the soil has a cv value of 0.4 m2/month. Calculations indicate that it would take approximately 22 months for the settlement to occur under the weight of the proposed embankment. How long would be required for a surcharge imposing a pressure of 56.4 kPa to cause the 0.30 m of settlement?arrow_forwardDefine the Determination of preconsolidation pressure ?arrow_forward
- A 12m high circular tank with 45m radius contains oil weighing 9.4kN/m3. This tank stands over a 3m saturated sand layer (γsat = 18.88 kN/m3) underlain by a 14m thick clay layer (γsat = 17.30 kN/m3 , e = 1.27 and Cc = 0.40). Neglect weight of the tank. Assume no precompression has occurred. What is the difference between the settlement below the center and below the end of the tank?arrow_forwardPlot the following data and determine the preconsolidation pressure and the modified compression index. % Consolidation (Compression is +) Pressure (kPa) % Consolidation (Compression is +) Pressure (kPa) 0.09 5 7.34 160 0.11 10 7.6 320 0.12 20 8.35 640 0.26 40 12.65 1280 0.98 80 17.41 2560 1.91 160 22.18 5120 4.19 320 21.65 1280 8.05 640 20.63 160 8.03 320 19.26 40 7.83 160 15.35 5 7.21 80 Specimen height is 2.54MM, Sample is from a depth of -11.5marrow_forwardA masonry dam of trapezoidal cross section, with one face vertical has a thickness of 2 ft and 10 ft at the bottom. It is 22 ft high and has a horizontal base. The inclined face is subjeted to water pressure. The water standing to depth of 15 ft above the base. The weight of the masonry is 150 lb per cu.ft. If there is no hydrostatic uplift,a. Where will the resultant pressure intersect the base?b. What is the maximum pressure?arrow_forward
- A recently filled up fill was 10.54 m thick and its average void ration was 1.0. The fill was loaded on the surface by constructing an embankment covering a large area of the fill. Some months after the embankment was constructed, measurements of the fill indicated an average void of 0.8. Calculate the compression of the fill.arrow_forwardA recently completed fill was 6m thick and it's initial average void ratio was 1.0. The fill was loaded on the surface by constructing an embankment covering a large area of the fill.Measurement of the fill after 5 months indicated an average void ratio of 0.8 Estimate the compression of the fill after 5 months Estimate the total compression of the fill after one year assuming the average void ratio after one yeararrow_forwardi. Describe how changes in the mean normal stress affect the sign and magnitude of the excess pore water pressure in a soil. ii. Which would probably provide better support for a large, heavy building, a diorite or a shale? Why?arrow_forward
- 1.A raft foundation 60 X 40 m carrying a net pressure of 145 kN/m^2 is located at adepth of 4.5 m below the surface in a deposit of dense sandy gravel 22 m deep: thewater table is at a depth of 7 m. Below the sandy gravel is a layer of clay 5 m thickwhich, in turn, is underlain by dense sand. The value of mv for the clay is 0.22 m^2/MN. Determine the settlement below the centre of the raft, the corner of the raftand the centre of each edge of the raft, due to consolidation of the clay.arrow_forwardA 1.22m diameter spear floats half submerged in salt water (spec. weight = 10.05 KN/m²). What minimum weight of concrete (spec. weight = 23.56 kN/m²) used as an anchor will submerged the sphere completely?arrow_forward5 - A rectangular deck scow 31.15 m long, 6.15 m wide and 3.67 m high has a draft of 1.22 m when light and a draft of 3.06 m when loaded. The bottom length of the scow is 23.18 m. The waterline is 29.26m long when the scow is loaded with rocks and 25.50 m long when light. If the sea water weighs 1028 kg/cum and the loaded dredged material weighs 3208 kg/cum, determine the volume of the loaded rock.arrow_forward
- Principles of Foundation Engineering (MindTap Cou...Civil EngineeringISBN:9781305081550Author:Braja M. DasPublisher:Cengage LearningFundamentals of Geotechnical Engineering (MindTap...Civil EngineeringISBN:9781305635180Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage Learning