OasisLMS

Soil Liquefaction has been a major cause of damage to many Civil Engineering Structures like multi-storey buildings, storage tanks, bridges, etc. in seismically active areas during many past earthquakes. The vulnerable performance of foundations in liquefied ground is a complex phenomenon earthquake induced loadings because of the loss of shear strength and stiffness in soil due to development of excess pore pressure. Therefore, Liquefaction Potential Analysis is essential to be done at such potentially vulnerable sites to liquefaction based on detailed Geotechnical Investigation in seismically active zones and further suggest viable Liquefaction Mitigation Techniques for the project concerned based on the soil type present, its particle size, soil gradation, existing water table level of the site, pore pressure, ground acceleration, and other factors like lateral spreads, flow failures, sloping ground, etc. that are responsible for earthquake induced liquefaction, which can be a combination of more than one method using geotechnical basics to produce an adequate solution for the Site. A case study is being discussed here wherein a combination of two most economical & easy to implement liquefaction mitigation techniques are recommended to be adopted at this Seismic Zone IV site of India with a focus on saving our valuable available natural Mother Earth’ s resources for our future generations thinking along with environmental sustainability. A combination of dynamic compaction for converting a few deep liquefying soil layers to non-liquefiable ones and further little bit of soil replacement at top was decided as the most feasible geotechnical solution for the proposed Structure with conventional footings in a way so as to accommodate post-earthquake settlements, if any due to a few still remaining deep liquefaction susceptible soil layers, thus, avoiding deep pile foundation which would have been costly and used lot more natural resources in the form of different building materials.

Anurag Kapoor, Arun Soil Lab Pvt. Ltd.

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