Appraisal of various measures for liquefaction flowslide mitigation in a mild sloping ground
Appraisal of various measures for liquefaction flowslide mitigation in a mild sloping ground
Liquefaction-induced flowslides would cause significant damages and casualties as the case of 2018.9.28 incidences of Palu, Sulawesi, Indonesia, where the flowslides occurred immediately after a severe earthquake and led to an extremely-long distance of sliding on mild sloping ground. The conditions that would favour soil liquefaction and the associated flowsliding hence become the focus of the incident. Another issue deserved further attention, however, would be strategy for preventing or mitigating the problem. In accordance, the aim of this study is to apprise the performance and effectiveness of various measures on the mitigation of soil liquefaction and flowsliding. The mitigation measures considered herein include: stone-column (SC), micro-pile (MP), densification (DS), encased stone column (ESC) soil grouting (GT), and groundwater lowering (GL), which are commonly adopted in engineering practice. The performance and effectiveness of the mitigation measures are assessed numerically in terms of their responses in the excess pore pressure generation in soil as well as the lateral deformation of soil deposit due to the excitation of seismic motion. Results generally indicate the SC, ESC, and DS options are more effective in prohibiting the generation of excess pore pressure, and hence in reducing soil liquefaction, than the other options. We also notice the MP, SC, and ESC options would be more effective in preventing the lateral deformation, and therefore in avoiding the flowslide or lateral spread in soil deposit.
Muhammad Hamzah Fansuri; M. Chang; R. R. Rayhansyah; H. J. Lin; Togani Cahyadi Upomo; R. Kusumawardani
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
B - Geohazards
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