Factors Influencing Sand Re-liquefaction in Shaking Table Test

Authors

  • Dikshit Babu Nepal State Key Laboratory of Ocean Engineering, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Jianliang Deng State Key Laboratory of Ocean Engineering, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Jinjian Chen State Key Laboratory of Ocean Engineering, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Prakriti Pokhrel Masters Research Scholar, Pokhara University, Nepal

DOI:

https://doi.org/10.3126/njce.v1i1.43373

Keywords:

RE-liquefaction, Shake table, EPWP, Liquefaction resistance, PGA

Abstract

Cases of historical earthquakes show that liquefied sand deposits may undergo re-liquefaction yet again by a succeeding earthquake. However various factors such as the depth of sand deposits, peak ground acceleration, and shaking duration of an earthquake can affect the re-liquefaction occurrence. To understand this underlying mechanism, a series of shaking table experiments were performed by varying the depth of sand model, peak ground acceleration, and shaking duration of input motion. The excess pore water pressure and the acceleration response of the sandy model in the process of re-liquefaction in the sand were measured. The test result demonstrated that during a subsequent re-liquefaction, shear wave propagation mechanism and the number of times sand re-liquefy varies with the depth of sand model suggesting that the re-liquefaction resistance is depth-dependent, and the soil layer near the surface is most likely to be liquefied. The analysis by varying peak ground acceleration and shaking duration of input motion indicated that the model subjected to shorter duration and higher peak ground acceleration of input motion have a greater tendency to re-liquefy in multiple number of shaking, signifying that the conventional strategy for liquefaction resistance needs to be improved before it can be implemented for the analysis of site liquefaction. Based on the findings of parametric studies, there exists a critical liquefaction void ratio within a zone with which we can forecast the presence or absence of liquefaction in the future earthquakes.

Downloads

Download data is not yet available.
Abstract
53
PDF
61

Downloads

Published

2021-01-31

How to Cite

Nepal, D. B., Deng, J., Chen, J., & Pokhrel, P. (2021). Factors Influencing Sand Re-liquefaction in Shaking Table Test. Nepal Journal of Civil Engineering, 1(1), 51–59. https://doi.org/10.3126/njce.v1i1.43373

Issue

Section

Articles