Proceedings of DFI-India 2018: 8th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
Mitigation of Liquefaction Potential Using Vibro Compaction
Tanmay Gupta, Madan K. Annam and Valluri Sridhar
Earthquakes are one of the most disastrous natural event. It remains an area of research to predict the earthquakes, but always there is room for learnings from the earthquakes. One such risk is the liquefaction potential of soils in loose sand deposits with shallow ground water table. Addressing liquefaction mitigation in foundation design is one of the greatest challenges for practicing foundation engineer. The mitigation of liquefaction potential could be achieved by several methods predominantly with vibro compaction or dynamic compaction and vibro stone columns etc. The work in this study highlights the liquefaction evaluation procedure and its mitigation using vibro compaction. Soil investigation works using eCPTs were conducted before the start of the works to evaluate the seismic vulnerability of soil in terms of liquefaction potential. Field trials were conducted at site to arrive at optimum design of vibro compaction. High quality control using computerized output was monitored to achieve the required compaction of the soil. The amount of backfill required resulting from subsidence of surface was recorded to ensure the effectiveness of vibro compaction work. After ground improvement, soil investigation works were conducted to assess efficacy of vibro compaction. Subsequently, full size plate load tests were conducted to check the improved load settlement characteristics of improved ground. Based on the findings of this study, vibro compaction proved as an effective ground improvement technique to mitigate the liquefaction potential of soil, especially in loose sandy deposits.
|article #3176; publication #1050 (India2018)|