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Lec4_Piled Raft

20-Oct-15 Steps involved

20-Oct-15 Steps involved in Piled Raft Design Step 1: The safe bearing capacity of raft from shear consideration is checked so that raft can transfer the load to soil without failure. The settlement criterion is also checked. Commonly the safe bearing capacity (SBC) of raft on cohesionless soils (sands and non-plastic silts) is very high. ‣ For Raft size 20 m x 20 m, SBC will be in the range of 75 to 125 t/m 2 Prof. V.S.Raju Consultants 7 Step 2: Steps involved in Piled Raft Design The settlements of raft are calculated assuming first that there are no piles. If the settlements are < 75 mm, then a raft foundation will suffice. Step 3: If the settlements are > 75 mm, then piles are provided to act as settlement reducers. The number of piles is estimated so that the settlements of the piled raft foundation system are less than 75 mm. The ultimate capacity of the pile is used in design. Prof. V.S.Raju Consultants 8 V.S.Raju Consultants 4

20-Oct-15 Steps involved in Piled Raft Design Step 4: ‣ The load shared by the piles and the raft are estimated. The load coming on the raft will be shared by raft (directly transferring to soil layer below) and the piles (transferring the load to soil through skin friction and end bearing). The load sharing depends on relative stiffness of piles and soil support to the raft. Prof. V.S.Raju Consultants 9 Step 5: The settlements due to load on piles are estimated Prof. V.S.Raju Consultants 10 V.S.Raju Consultants 5

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