3 A Explain Using Diagrams The Key Differences Between The Settlement Behaviour Of Coarse Grained And Fine Grained So 1 (71.28 KiB) Viewed 18 times
3 A Explain Using Diagrams The Key Differences Between The Settlement Behaviour Of Coarse Grained And Fine Grained So 2 (71.28 KiB) Viewed 18 times
3. (a) Explain using diagrams the key differences between the settlement behaviour of coarse-grained and fine-grained soils. (25 marks) (b) A road embankment is to be built on clay 7m thick overlying dense gravel. The net vertical pressure applied by the embankment is 85 kPa and the embankment is large enough that the loading can be considered to be one dimensional The soil profile is as shown in Figure 23 (b), with the clay layer being divided into an upper and lower layer. The value of m, for the upper clay layer is 0.3 m®/MN and for the lower clay layer m = 0.15 m /MN. (0) Determine the final settlement under the center of the embankment due to consolidation. () Suggest two measures that may be taken to reduce the potential harm caused by this settlement. 85 kPa Tould 3m Upper Clay m40.3 MN 7m 4m Lower Clay -0.15 MN Grave (50 marks) Fig. Q3 b) (c) Name the most common laboratory test used to determine the value of my and briefly describe how it is carried out using a diagram if necessary. Mention two other consolidation parameters that may be determined during this test. (25 marks)
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