lab7 - the change in stress produced by construction and...

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SUMMARY For Part A, we visualized the area where the foundation was to be built prior to construction. The geostatic stresses caused by the self-weight of the soil were found up to a depth of 25 ft. For part B, construction operations at the site required that below the tank and for an area corresponding to twice the radius of the tank, the top meter of soil be removed and replaced with granular fill. The stress increments and new stress distribution versus depth following the placement of the fill were found using section the equations found in section 9.6 and 9.7 of Das. Equation 9.6 was used to find the vertical stress below the center of a uniformly loaded circular area whereas equation 9.7 was used to find the vertical stress at any point below a uniformly loaded circular area. For Part C,
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Unformatted text preview: the change in stress produced by construction and filling of the tank were to be found. These were calculated similarly to part B using equation 9.6 and 9.7 in Das. The final step was to calculate the change in stresses due to construction of the large building in proximity to the tank. The vertical stress caused by a rectangular loaded area on the tank was found by applying the properties of superposition and symmetry. ANSWERS TO QUESTIONS Given the loads and positions of the building, the differential settlement below the tank does not appear to be a concern. Assuming that the area of the tank is a square rather than a circle and using a pressure bulb analysis, it found that the load applied at the surface by the full tank does not have a significant effect on the stress below the building....
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