APPLICATION THE POINT FOUNDATION (PF) METHOD FOR SOFT SOIL IMPROVEMENT: A CASE STUDY FROM VETNAM

  • Bui Truong Son Department of Engineering Geology, Hanoi University of Mining and Geology, Hanoi, Vietnam
  • Nguyen Thi Nu Department of Engineering Geology, Hanoi University of Mining and Geology, Hanoi, Vietnam
  • Nguyen Thanh Duong Department of Engineering Geology, Hanoi University of Mining and Geology, Hanoi, Vietnam
  • Nguyen Anh Ngoc Department of Engineering Geology, Hanoi University of Mining and Geology, Hanoi, Vietnam
Keywords: Point foundation, Soft soil, Capacity, Settlement

Abstract

The point foundation method is the head enlarged cement deep mixing columns with high-quality control which can be used for soft ground improvement. The article aims to present the application of this method to treat soft soil for the foundation of Samse Vina factory, Ninh Binh province. The thickness of soft soil varies from 5.4 m to 7.4 m with high compressibility and low shear strength. Thus, point foundation was used to improve this layer. The prediction methods of soil bearing capacity and the settlement on the point foundation were calculated. After the treatment of soil, the unconfined compression strength of the point foundation column was determined and the static compression test for the point foundation column was also performed. The research results show that this method can significantly reduce the settlement of shallow footing and improved the bearing capacity of the soil. The final settlement of shallow footing was smaller than 2.54 cm and the bearing capacity of soil treatment can be satisfied with the requirement of construction building. This is a successful case of the application of point foundation to improve soft soil in Vietnam. 

Published
2020-10-28