This Standard provides general requirements for the execution, testing, supervision,monitoring and installation methods of prefabricated vertical drain projects. It also includes information on design considerations, and practical and design aspects of vertical drainage.Prefabricated vertical drains are used for the improvement of low-permeability, highly compressible soils, and in on-land and marine constructions for—
(a) (pre)consolidation and reduction of post-construction settlements; speeding up the consolidation process by decreasing the path lengths for pore water dissipation;
(b) increasing soil stability (by increasing effective stresses in the soil);
(c) groundwater lowering; and
(d) mitigation of liquefaction effects.
