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Lec4_Piled Raft

20-Oct-15 3. The

20-Oct-15 3. The excavated surface should be thoroughly compacted: ‣ For Rafts : Heavy duty vibratory roller or plate vibrator ‣ For Pile assisted Rafts: Heavy duty plate vibrator which passes in between the piles 4. Flooding should not be used for compaction. 5. For dust control, if required water sprinkling can be done. 6. Desirable to place 125 mm thick soling stones on the compacted surface. The soling stones should be well compacted. 7. The mud mat for the raft will come on the soling stones. Prof. V.S.Raju Consultants 35 In case of high Ground Water Table (GWT): 1.Prior to the excavation, GWT has to be lowered to 1 m below the bottom of the excavation. This level has to be maintained till the foundations are cast. 2.The ground water lowering has to be done by a specialist contractor. This is especially difficult in case of Silts, Sandy silts and Silty sands. 3.There must be 100 % standby power for the dewatering system to ensure that the GWT is below the bottom of the excavation at all times. Prof. V.S.Raju Consultants 36 V.S.Raju Consultants 18

20-Oct-15 PROJECTS NEAR DELHI: Sector Area Number of storeys Ground Water Table (m) Foundation Recommendations 103 Gurgaon 1B + S + 14 2 Raft Foundations 68 Gurgaon 1B + G+ 13 to 25 2B + G+ 25 to 33 21 Raft Foundations 86 Gurgaon 1B + G+ 13 to 17 28 Raft Foundations 16 B Gurgaon 3B + G+ 17 to 39 11 Pile Assisted Raft, Raft Foundations 67 Gurgaon 2B + G+ 18 to 33 20 Raft Foundations 62 Gurgaon 3B + G+ 29 to 37 8 Pile Assisted Raft Foundations 102 Gurgaon 1B + G+ 26 1.5 Pile Foundations 128 Noida 2B + G+ 35 to 38 8 Pile Assisted Raft Foundations Prof. V.S.Raju Consultants 37 Contd… Sector Area Number of storeys Ground Water Table (m) Foundation Recommendations 16 Noida G + 22 to 34 18 Pile Assisted Raft, Raft Foundations Gwalpahari Gurgaon 3B + G+ 17 21 Raft Foundations 48 Gurgaon 2B + G+ 34 21 Pile Assisted Raft Foundations 58 Gurgaon 2B + G+ 23 to 30 7 Raft Foundations Gwalpahari Gurgaon 2B + G+ 28 Not met Raft Foundations Prof. V.S.Raju Consultants 38 V.S.Raju Consultants 19

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