Abstract
Soil consolidation using deep mixing method (DMM) is commonly used to protect soft ground in alluvial stratum in deltas such as Mekong Delta. In this study, the finite element method (FEM) using PLAXIS software is adopted to analyze the stress distribution on columns and ground base of the deep cement mixing (DCM) columns system combined with geotextiles in the consolidation of soft ground under road embankment in Tien Giang Province. With this method, the behavior of the DCM columns in soft ground treatment is examined by the distribution of stress and settlement of the DCM columns and soft soil layers. Simultaneously, the settlement of road base construction is monitored. The stress distribution on DCM columns and their settlement are also given from the analysis of FEM. The FEM models simulating the soft ground consolidated with DCM columns combined with geotextile under the road embankment in Tien Giang with the DCM columns of 0.6 m diameter, 11.2 m length and 1.0m center –to- center spacing show the largest settlement of 0.120 m and the stability coefficient of 1.679.
Highlights
The Mekong Delta has young tectonics of which over 90% of the area is soft soil
The study results showed that the compressive strength of the cement-soil samples increased even when cement content was very low and the settlement of the footing was reduced by 80% depending on the quantity and length of the deep cement mixing (DCM) columns [2]
When simulating the soft ground consolidated with DCM columns and geotextiles, the surplus pore water pressure is taken into account and the surplus pore water pressure of this study reaches 164.49 kN / m2 (Figure 10)
Summary
The Mekong Delta has young tectonics of which over 90% of the area is soft soil. The regional economic development over recent years has promoted the integration of civil engineering technology to meet the economic needs. With the policy of developing infrastructure for the region, many traffic works, dams, warehouses and factories have been built. A normal practice to solve this problem is to replace soft soil layer with a new one and make subsidence compensation [1]. Because the resources are limited and non-renewable, scientific, technological and engineering integration over recent years has brought new solutions to handle this problem with the goal of treating the foundation for a long-term stability, shortening treatment duration and reducing the amount of resources to compensate future subsidence
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