By M. Puller
This e-book assembles the sensible principles and info for the effective and good value execution of deep excavations. It attracts jointly a wealth of expertise of either layout and building from released paintings and the lifetime perform of the writer.
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Additional info for Deep excavations : a practical manual
No specific allowance is made for the shear stresses developed on the pile’s inner wall. The alternative methods outlined in Table 6 represent provisional best estimates and the tentative plugging criterion given in Step J1 is wholly empirical. Further research is required to explore the basic mechanisms of internal shaft friction development and plugging. However, the remaining uncertainties are unlikely to have a major impact on practical design and the lower limit recommendation given in Step J3 should offer safe estimates for Qb.
0 0 10 20 30 40 50 60 70 80 90 100 Dr at pile toe (%) Figure 21. 8 Diameter, D (m) Figure 22. 5 Pile type Conc. 0 0 10 20 30 40 50 60 70 80 90 100 Dr at pile toe (%) Figure 23. 8 Diameter, D (m) Figure 24. 1 End bearing database for clay Page 53 The new data assembled in Table 8 do not provide any new reliable entries for the total end bearing database in clay; Chow’s original database is re-summarised below. Her interpretation of these field experiments led to the CPT based design rules summarised in Table 5.
Figures 13 to 16 show scatter diagrams of (Qc /Qm) against Dr, and normalised pile length for the updated database. As in the 1996 evaluation, the ICP method eliminates the strong skewing produced by the API method and is equally reliable for open-ended and closed-ended piles. While the ICP method can be applied confidently to a wide range of conditions, the variability is likely to reduce when considering a sub-set of similar piles, as shown in Table 10 for open-ended piles driven in North Sea sands.
Deep excavations : a practical manual by M. Puller