Deep soil mixing and mass stabilization technology as flexible foundation under culvert boxes of pump station

抄録

The renewal project of the pump station in reclamation land of lagoon required proper foundation for the box culvert. The soft soil more than 40m deep results in harmful settlement and required ground mitigation by Deep Soil Mixing (DSM) columns combined with Mass Stabilization (MS) as a floated spread foundation. The flexible foundation contributes the sustainable system due to prevents serious leakage under the culvert during the operation if it is supported by the piling foundation. Sustainable aspects such as saving binder content and reducing waste soil strongly support the dry mixing technology and contribute to reduce carbon dioxide emissions. Productivity better than wet mixing brings considerable advantage to reduce carbon dioxide emissions. Prior to Mass stabilization work and DSM columns installation, careful and comprehensive laboratory mixing tests were conducted to ensure most suitable binder content. Consequently, the binder content less than half of preliminary estimation was conducted. The quality assurance and quality control demonstrated excellent performance of DSM columns.