WHAT ARE THE ADVANTAGES AND DISADVANTAGES OF DRILLED PIER FOUNDATIONS
Advantages and Disadvantages of Drilled Pier Foundations
- Pier of any length and size can be constructed at the site.
- Construction equipment is normally mobile and construction can proceed rapidly.
- Inspection of drilled holes is possible because of the larger diameter of the shafts.
- Very large loads can be carried by a single drilled pier foundation thus eliminating the necessity of a pile cap (in case of a pile foundation).
- The drilled pier is applicable to a wide variety of soil conditions.
- Changes can be made in the design criteria during the progress of a job.
- Ground vibration that is normally associated with driven piles is absent in case of drilled pier construction.
- Bearing capacity can be increased by under-reaming the bottom (in non caving materials).
- Installation of drilled piers needs a skillful supervision and quality control.
- The method is incommodious. Sufficient storage space is needed for all the equipments and materials used in the construction.
- In case of driven pile, there is an added advantage of increased bearing capacity due to compaction in granular soil, which cannot be obtained by drilled pier construction.
- Construction of drilled piers is very difficult at places where there is a heavy current of ground water flow due to artesian pressure.