Study on Using Laboratory Model to Research for Bearing Capacity of Soft Ground Improved by Deep Cement Mixing Columns due to Embankment Load with Different Montmorillonite Contents

摘要

The Mekong Delta is the largest delta of Vietnam, covered Holocence sediment due to sedimentation of the Mekong river system. The minerals of soft clay in this area usually include: Montmorillonite (MMT), Illite, Chlorite, and Kaolinite...MMT in clay affect to the soil swelling properties. The developed swelling pressure will destroy the lightly construction and road surface. This research simulated the influence of MMT to the bearing capacity of soft ground improved by deep cement mixing (CDM) columns by laboratory model. To conduct this research, the laboratory model 1g has been studied and made. The different of MMT contents is changed from 6% to 15% for soft ground to research the changes to strength of soft ground improved by CDM columns. In addition, this research also investigates the optimum cement content to unconfined compressive strength of the soil cement specimen with the different MMT contents. Soft ground improved by deep cement mixing may be used for foundation of the immersed tunnels.