Proceedings of DFI-India 2018: 8th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
A Review on T Shaped Deep Mixing Technology in Engineering Projects
Rashmi Patel, Research Scholar and Jigisha Vashi, Assistant Professor
Deep mixing (DM) method is commonly used for supporting embankments on soft grounds for highway and railway engineering. This method is replete with issues of insufficient mixing, grout spilling, and column strength decreasing with depth. These problems can be resolved by the new technology of T-Shaped Deep Mixing column, which improves the quality of soft soil, which in turn further improves the embankment stability. TDM column have an enlarged cap and therefore it can take more applied load in comparison to the conventional column which further results in less stress in soil further resulting in decreased soil settlement and differential settlement of the ground, and an increase in consolidation rate. The parameters studied here for field embankment loading conditions were, stress concentration ratio, excess pore water pressures generated in the soft clays, total monitored settlement, and lateral soil displacement. From the literature it is observed that TDM columns has significant advantages over conventional DM columns because of mitigation of settlement and improved performance of the embankments while decreasing construction costs. It is also found that material used in TDM column is less compared to conventional DM column which decreases the construction cost of the project. The results indicate that TDM method is a more economic and efficient solution for soft ground improvement under embankments. Earlier works by numerous researchers on T- shaped deep mixing column including laboratory work, full-scale field tests, analytical and numerical analyses related to improvement of soft soil is reviewed in this paper. Results are discussed with the help of figures depicting charts, failure modes and it has been found that T- shaped deep mixing method provides an enhanced alternative to the existing methods of improving soft clay with regard to soil bearing capacity and settlement criterion.
|article #3157; publication #1050 (India2018)|