Workshop Building - Tolerate Differential Settlements - Engineering Assignment Help

Assignment Task :

Task 1: Workshop buildina 
A piece of highly sensitive, heavy machinery, supported by a 3 m x 3 m square pedestal, will be located at the centre of the workshop building. The working load applied by the machine is 8500 kN (S'=11050 kN) The machine is settlement sensitive and can only tolerate differential settlements of less than 2 mnVm anywhere over the pedestal cap. In addition. the admissible differential settlement between the pedestal and the floor of the workshop building (i.e. a slab on the hardstand) must not exceed 40 mm over 25 years. It is estimated that the pedestal will be constructed 6 months after construction of the hardstand and it will be installed through. but independently of. the slab. 
a) Estimate the settlement of the workshop slab, assuming it is constructed as soon as the hardstand is raised to its final height. Provide settlement estimates for 6 months and 25 years. 

b) Advise possible founding systems for the pedestal to support the machinery loads. Consideration is to be given to shallow foundation systems as well as piles or pile groups with a flexible pile cap. The various locally-available pile types which may be considered include conventional bored piles up to 500mm diameter. continuous flight auger (CFA)/ grout injected up to 500mm diameter. driven concrete piles up to 400mm, and screw cast concrete (Allas/Omega) piles up to 350mm diameter, all limited to maximum lengths of 20m Pile calculations should be undertaken in accordance with AS2159-2009 and recommendations should include pile size, founding depths, pile spacings and expected settlements. Confirm that the chosen arrangement satisfies the differential settlement criteria for the pedestal. 

c) Evaluate the likely performance of the slab — pedestal arrangement against the differential settlement criterion imposed. 

d) If applicable, design a ground improvement strategy employing vertical drains and/or preloading that will allow the slab — pedestal arrangement to meet the differential settlement criterion imposed 

e) Advise on the most appropriate method of verifying the design bearing capacity or pile capacity for each footing type and advise on the exposure classification for the site with respect to AS2159-2009 based on the geo-chemical testing of the water provided. 

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