Lec4_Piled Raft

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20-Oct-15 Step 6: The settlements of the raft due to the load shared by the raft are estimated Total settlement of the piled raft = <strong>Raft</strong> contribution + Pile contribution This should be < 75 mm for cohesionless soils < 100 mm for cohesive soils Subgrade modulus of raft k = Gross bearing pressure on <strong>Raft</strong>∗∗∗ Total raft settlement (Without piles) *** More appropriate would be to use net bearing pressure. But in the structural Analysis of the raft gross bearing pressure (actual loading from superstructure) is used. Prof. V.S.Raju Consultants 11 Current Practice Method 1 Plate Load Test Prof. V.S.Raju Consultants 12 V.S.Raju Consultants 6
20-Oct-15 Zone of Influence Prof. V.S.Raju Consultants 13 Recommended values in literature Most often used reference is Foundation Analysis and Design book by Joseph E Bowles Soil E s (kN/m 2 ) Sand (Normally consolidated) 500(N+15) Silty Sand Clayey sand 300 (N+6) 320 (N+15) Prof. V.S.Raju Consultants 14 V.S.Raju Consultants 7
Page 1 and 2: 20-Oct-15 PILED RAFT by Prof. V.S.R
Page 3 and 4: Load (t) 20-Oct-15 Raft Piles Settl
Page 5: 20-Oct-15 Steps involved in Piled R
Page 9 and 10: 20-Oct-15 Drawbacks of Current Prac
Page 11 and 12: 20-Oct-15 Predicting the settlement
Page 13 and 14: Settlement (mm) 20-Oct-15 Results f
Page 15 and 16: 20-Oct-15 Structure Forum(Kastor Ta
Page 17 and 18: 20-Oct-15 We need number of settlem
Page 19 and 20: 20-Oct-15 PROJECTS NEAR DELHI: Sect
Page 21: 20-Oct-15 Katzenbach R, Arslan V a

Lec4_Piled Raft

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