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Liquefaction Mitigation Measures for Weak Subsoil of Earthen Embankments
Failure of earthen embankments during earthquake has been reported often in most of the major events (Loma Prieta Earthquake (1989), Hyogo Ken Nambu Earthquake (1995), Bhuj Earthquake (2001), Sumatra Earthquake (2004), Great Eastern Japan Earthquake (2011), etc.). Most of these failures are reported to be due to the vulnerability of foundation soil upon which the earthen embankment is founded. Liquefaction of subsoil has been attributed to be one of the major causes for such vulnerability. These embankments play a major role in a country’s growth and any damage to these facilities will hamper the economic development of infrastructure, especially with respect to rural development. Considering this fact, there is a requirement to strengthen the subsoil by densification or use of an alternate solution to prevent structural failures by making subsoil strong. It becomes even more necessary to plan the strengthening of existing structures so that earthen embankments with weak subsoil founded in seismically active zones can be retrofitted considering future seismic event. Different mitigation measures can be proposed such as use of geotextiles, use of sheet pile walls or providing dense wall at appropriate locations in the subsoil to strengthen it. In this paper, an attempt is made to use GEOSTUDIO, a finite element software with two dimensional plane strain idealization to model the earthen embankment with and without dense wall and study the liquefaction vulnerability of subsoil and hence the overall performance of earthen embankment. The parameters such as location, stiffness, geometry of dense wall, initial condition of subsoil and intensity of earthquake shaking will be assessed from the overall seismic performance consideration of earthen embankment. The results suggest that the provision of dense wall can be one convenient measure to strengthen the subsoil from liquefaction vulnerability.
Liquefaction Mitigation Measures for Weak Subsoil of Earthen Embankments
Failure of earthen embankments during earthquake has been reported often in most of the major events (Loma Prieta Earthquake (1989), Hyogo Ken Nambu Earthquake (1995), Bhuj Earthquake (2001), Sumatra Earthquake (2004), Great Eastern Japan Earthquake (2011), etc.). Most of these failures are reported to be due to the vulnerability of foundation soil upon which the earthen embankment is founded. Liquefaction of subsoil has been attributed to be one of the major causes for such vulnerability. These embankments play a major role in a country’s growth and any damage to these facilities will hamper the economic development of infrastructure, especially with respect to rural development. Considering this fact, there is a requirement to strengthen the subsoil by densification or use of an alternate solution to prevent structural failures by making subsoil strong. It becomes even more necessary to plan the strengthening of existing structures so that earthen embankments with weak subsoil founded in seismically active zones can be retrofitted considering future seismic event. Different mitigation measures can be proposed such as use of geotextiles, use of sheet pile walls or providing dense wall at appropriate locations in the subsoil to strengthen it. In this paper, an attempt is made to use GEOSTUDIO, a finite element software with two dimensional plane strain idealization to model the earthen embankment with and without dense wall and study the liquefaction vulnerability of subsoil and hence the overall performance of earthen embankment. The parameters such as location, stiffness, geometry of dense wall, initial condition of subsoil and intensity of earthquake shaking will be assessed from the overall seismic performance consideration of earthen embankment. The results suggest that the provision of dense wall can be one convenient measure to strengthen the subsoil from liquefaction vulnerability.
Liquefaction Mitigation Measures for Weak Subsoil of Earthen Embankments
Lecture Notes in Civil Engineering
Jose, Babu T. (editor) / Sahoo, Dipak Kumar (editor) / Vanapalli, Sai K. (editor) / Solanki, Chandresh H. (editor) / Balan, K. (editor) / Pillai, Anitha G. (editor) / Ghosh, Barnali (author) / Prasad, S. K. (author)
Indian Geotechnical Conference ; 2022 ; Kochi, India
2024-09-25
7 pages
Article/Chapter (Book)
Electronic Resource
English
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