Q1 14 Marks Answer All Sections A A Rectangular Foundation 4m X 8m Is To Be Constructed On A 6m Thick Layer Of Sand U 1 (68.2 KiB) Viewed 43 times
Q1 14 Marks Answer All Sections A A Rectangular Foundation 4m X 8m Is To Be Constructed On A 6m Thick Layer Of Sand U 2 (22.73 KiB) Viewed 43 times
Q1 14 marks answer all sections. a) A rectangular foundation, 4m x 8m is to be constructed on a 6m thick layer of sand underlain by bedrock. The foundation will apply a pressure 150kPa to the sand's surface. Near the surface the sand has an elastic modulus of E' =14MN/m² and just above the bedrock it has an elastic modulus of E =24MN/m² Calculate the maximum immediate settlements which will be generated by the application of the foundation. b) Label the normal effective stress-void ratio graph in Figure Q1 on page 6, and attach it to your answer booklet with the treasury tag provided. Define all terms and explain the shape and implications this has on soil behaviour. c) The stress in the centre of a layer of saturated clay, 10m thick and underlain by a strata of weathered sandstone, is to be increased from 100kPa to 300kPa over a wide area. Use the graph in Figure Q1 to determine the coefficient of compressibility, my. If the coefficient of consolidation Cy=1.02m”/yr, how long will it take for only 50mm of settlement due to consolidation to still remain. 10 marks 9 marks
1 0.9 0.8 Void ratio, e 0.7 0.6 0.5 0.4 10 10000 100 1000 Normal Effective Stress (kPa)
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