week 7 tut solution

week 7 tut solution - Answers to Tutorial questions (Class...

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Answers to Tutorial questions (Class 7) 1.1. A single pile with the diameter of 0.5 m and is imbedded into clayey soils with depth of 6m. There are two layers of different soils. The upper layer of the soil is 2 meter thickness and its undrained strength is 30 kPa. The lower layer of the soil is 20 meter thickness and its undrained strength is 55 kPa. Estimate the ultimate bearing capacity of the pile. Answer (Step 1) The bearing capacity of a single pile can be worked out by P u =P s +P b -W Considering that the effect of pile weight and that of the overburden pressure for the base resistance can be balanced, then P u =f s A s +f b A b (Step 2) The soils is clayey soils with undrained shear strength known, undrained analysis is used. Determining f s and f b . (Step 3) Find out P s For the first layer of soil c u =30 kPa<40 kPa α =1 for c u 40 kPa For the second layer of soil c u =55 kPa From the design curve, α =0.83 P s = α (layer1)c u (layer1) π DL(layer1)+ α (layer2)c u (layer2) π DL(layer2) =(1*30*2+0.83*55*4)*3*0.5
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week 7 tut solution - Answers to Tutorial questions (Class...

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