CONTENTS 



Page 



INTRODUCTION 1 



BACKGROUND 1 



STATE-OF-THE-ART PILE INSTALLATION PRACTICE 3 



Axial Pile Capacity 4 



Pile Design Methods 5 



LABORATORY TESTS OF SOIL-PILE INTERACTION BEHAVIOR 7 



Purpose and Approach 7 



General Investigation 7 



Program 8 



Test Materials 8 



Model Preparation Procedures 9 



Test Procedures 10 



Results 11 



FRICTIONAL BEHAVIOR TESTS 12 



Test Plan 12 



Test Materials 12 



Test Procedures 13 



Results 14 



CRUSHABILITY 14 



ERTEC Program 15 



Test Procedures 15 



Results 17 



ALTERNATIVE PILE CONCEPTS 18 



Backfilled Piles (BP) 20 



Vibratory-Installed Backfilled Piles (VBP) 21 



Pressurized Piles (PP) 21 



Backfilled and Pressurized Piles (BPP) 22 



Piles With Enlarged Tips (PET) 23 



Modified Drilled and Grouted Piles (MDGP) 24 



Keyed-in Piles (KIP) 24 



Drilled and Screwed Piles (DSP) 24 



