Performance of T-Shaped Deep Mixed Column over Conventional Deep Mixing Column for Soft Soils
The principle of ground improvement is to improve the engineering properties of soft soils to enhance stability and amplify bearing capacity for construction projects. T- Shaped Deep mixing column (TDM) is a newly emerging technology for this purpose. Numerous researchers have worked on this method of soil improvement through laboratory experiments, in situ testing and numerical modelling. Available literature on this topic have presented previous studies by various researchers on weak soil improvement using T- shaped deep mixing column methods, where the focus has been on the mechanical properties such as unconfined compressive strength, lateral displacement of column, vertical bearing capacity, ground surface settlement, area replacement ratio, stress concentration ratio and consolidation behavior of the improved ground. T shaped soil-cement deep mixed (TDM) columns are used nowadays to support embankments on soft ground for highway and railway engineering. Unlike disadvantages of the conventional method of deep mixing, such as insufficient mixing, grout spilling, and column strength decreasing with depth, this new method has advantages on material saving which further decreases the cost of the total project making it more economic, efficient and viable. TDM method also has advantages for reducing differential settlement under embankment load to increase embankment stability. The paper gives the insight into how TDM method is more efficient solution for the improvement of soft ground under embankment over conventional DM method for reducing surface settlement, lateral displacement of column at larger depth and improving the vertical bearing capacity of soil.
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