Why use PVD (Prefabricated vertical drain) over sand drain
Installation of PVDs typically 6,000 linear meters per day (depending on the soil and the machine used it changes from 2000 to 8000) and result in a lower project cost.- No (or less) risk of PVDs breaking during installation — sand drains can have discontinuities if mandril is withdrawn too fast.
- No (or less) risk of shear failure of PVDs during settlement — sand drains are vulnerable to shear failure during settlement.