석션드레인배수재(나선원통형)를 사용한 연약지반의 개별진공압밀침하

A vacuum pressure method has been developed to solve many problems in the conventional surcharge method such as embankments, and increased to the applied case in the country. Recently, to control target settlements in the field, there have been many studies to comparing settlements between vacuum pressure method and surcharge load method in the same conditions. In this study the settlement characteristics of soil subjected to vacuum pressure and surcharge pressure are discussed. The results indicate that if the vacuum pressure is applied to improve soft ground, there will be inward lateral displacement and the vacuum pressure will induce generally less settlement than a surcharge load of the same magnitude. The range of settlement reduction ratio is 0.54~0.67 based on Hooke’s law, 0.91 based on field cases, 0.75 based on theory of elasticity and coefficient of volumetric compressibility and 0.77~0.93 in case of recently applied cases in the thick soft ground.