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Lec4_Piled Raft

20-Oct-15 Examples in

20-Oct-15 Examples in Delhi Region –Settlements of Rafts 1. DIAL – Terminal 3 on Raft ‣ Settlements measured and reported as not significant. 2. Sector 58, Gurgaon Structure : Residential building 2B+30 floor on Raft. Frame completed Dead load settlements = 26 mm Estimated total settlement = 40 mm Prof. V.S.Raju Consultants 31 Settlements observations are being carried out for about 6 structures One structure in Noida is fully instrumented, where load on the piles, reactions of the base raft and the settlements are being measured. For one more structure in Noida, pile loads and settlements are planned to be observed. Prof. V.S.Raju Consultants 32 V.S.Raju Consultants 16

20-Oct-15 We need number of settlement observations: Method: ‣ Any precision leveling will be O.K ‣ Fix plates on the floor or to the columns ( basement is ideal), ground floor level is also adequate. Prof. V.S.Raju Consultants 33 Execution: The following points are crucial in particular for Rafts and Pile assisted rafts: 1. Flooding of the excavation from surface water during monsoon to be avoided. This can be done by proper bunding and sand bagging around the excavation and providing surface drainage away from the excavation. 2. The last 50cm of the excavation should be done just prior to placement of the mud mat. Prof. V.S.Raju Consultants 34 V.S.Raju Consultants 17

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