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A SPT based Liquefaction Analysis of Ramgarh Taal in Gorakhpur City

Author(s):

Nitish Kumar Chaudhary , M.M.M.U.T GORAKHPUR; Dr. S. M. Ali Jawaid, M.M.M.U.T GORAKHPUR; Ms. Sana Zafar, M.M.M.U.T GORAKHPUR

Keywords:

Liquefaction, SPT, CSR, CRR, Factor of Safety

Abstract

Soil liquefaction has been a major cause of damage to soil structure, lifelines and building foundation. Liquefaction is one of the major types for ground failure. Liquefaction is a soil behavior phenomenon in which a saturated soil losses their strength and stiffness due to high excess pore-water pressure generated by during strong earthquake ground shaking. The devastating damage of liquefaction induced ground failures in the Alaska 1964 and Niigata 1964 earthquakes serve as a clear reminder of such events. Liquefaction is one of the main effects during an earthquake that is responsible to structural failure and damage to roads, pipelines and infrastructures. Liquefaction is one of the ground failures in potential earth science hazard. Zoning for liquefaction, therefore, has been an important goal for seismic hazard mitigation. Ramgarh Taal is situated to the southeast of Gorakhpur in Uttar Pradesh. It is a natural lake. Since Gorakhpur falls in the seismic zone IV so there is need for the assessment of liquefaction potential. So the study area is “Ramgarh Taal” to recognize the conditions that exist in a soil deposit before an earthquake in order to identify liquefaction. The main aim of this work is to analyse the liquefaction potential of “Ramgarh Taal” in Gorakhpur city using SPT data collected from the various sites of project by simplified procedure of Idriss & Boulanger. Determination of liquefaction potential due to earthquake is complex geotechnical problem. Many factors including soil parameters and seismic characteristics influence this phenomenon. To assess the liquefaction potential in an area, it is important to examine the geotechnical characteristics like grain size distribution, percentage of silt, water table, water table depth and SPT ‘N’ value. Here liquefaction potential analysis is done to determine the factor of safety at different depth. The liquefaction is severe in the “Ramgarh Taal” due to the presence of silt and poorly graded sand. So the assessment of liquefaction helps us to select a suitable ground improvement technique and foundation system for future correction in the region. This study helps us to mitigate the disastrous effect of liquefaction.

Other Details

Paper ID: IJSRDV3I60516
Published in: Volume : 3, Issue : 6
Publication Date: 01/09/2015
Page(s): 1200-1206

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