Introducing the method of improving soft soil by combining prefabricated vertical drains with the vacuum preloading method

Abstract

In the context of modern infrastructure development, addressing soft soil to ensure the durability and stability of construction projects has become critically important. In Vietnam, particularly in the Mekong Delta, soft soil with unstable geotechnical properties is widespread. An advanced and effective method for improving soft soil is the use of prefabricated vertical drains (PVD) combined with vacuum preloading. This paper provides a detailed overview of the method of treating soft soil using PVD in conjunction with vacuum pumping, covering theoretical foundations, construction procedures, and practical applications. Experimental results demonstrate that this method achieves over 90% consolidation, reduces settlement to below 20cm, and ensures the safety of structures in compliance with Vietnamese standards. Simulation models and field experiments also confirm that combining PVD with preloading and vacuum pumping not only enhances stability but also minimizes deformation and potential failures. This method is particularly suitable for projects in areas with extensive soft soil and high urban development demands, such as the Mekong Delta.