Abstract
Prefabricated Vertical Drains (PVD) has become a standard method in soft soil improvementsproject to accelerate the soil consolidation time. Due to PVD’s primary function as drainage, it should haveadequate hydraulic properties, i.e., discharge capacity and transmissivity. This paper evaluates the effect ofincremental confining pressure on three types of PVD using an apparatus adopting ASTM D4716, a mechanismto determine the in-plane flow rate and transmissivity of geosynthetics. The apparatus is originally designed toobserve the discharge capacity of the PVD. Three types of PVD with different thickness and box channel coreshapes were tested under incremental confining pressure in the range of 50 to 200 kPa and varied hydraulicgradients. The results indicated that the reduction of discharge capacity under incremental confining pressureis higher for lower hydraulic gradients, and the reduction of discharge capacity is significant at high confiningpressure. The thickness of PVD held an essential role in transmissivity since PVD with greater thicknessprovides higher discharge capacity and transmissivity.
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