41. Two hundred and twenty driven cast-in-place piles

Two-hundred and twenty (220) driven cast-in-place piles were installed in 1990 in a very soft clay deposit. The characteristics of the deposit and the pile driving sequence are described in this paper. The pile driving induced upward ground movements, and the surrounding installed piles heaved up to 12.5 in. (32 cm). Quality control results show that 96 percent of the tested piles had some type of defects. To remediate the situation the contractor elected to install an additional 264 continuous flight auger piles.

The causes of the failure and recommendations to avoid heave problems for driven cast-in-place piles in soft soils are presented in this paper.

• 1. INTRODUCTION

• 2. SOIL CHARACTERISTICS

• 3. ANALYSIS OF THE PROBLEMS

• 4. ERRORS OR MISTAKES MADE

• 5. REMEDIAL WORK

• 6. CONCLUSION AND RECOMMENDATIONS

• REFERENCES