Effect of Log Piling Method for Liquefaction Countermeasureas by Large-Scale Shaking Table Test

Numata, Atsunori; Murata, Takuya; Riaz, Saima; Mimura, Kaori; Hara, Tadashi

doi:10.2208/jscejseee.71.i_274

Cited by 4 publications

(1 citation statement)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Prior investigations into the utilization of log piles for liquefaction mitigation have already demonstrated their efficacy. In a 1-g shaking table experiment conducted by [3], it was emphasized that maintaining a center-to-center distance between log piles of 4 to 5 times their diameter yielded substantial liquefaction prevention effects, comparable to established densification methods. Further studies have also highlighted log piling's utility as a soil improvement technique near existing structures, showcasing its ability to reduce settlement and enhance the seismic resilience of buildings [4,5].…”

Section: Introductionmentioning

confidence: 99%

State-of-the-Art Application of the Log-Piling Method in the Role of Shallow Ground Improvement for Liquefaction Mitigation

Milev,

Takashi,

Shoei

et al. 2024

AFST

View full text Add to dashboard Cite

This research paper focuses on evaluating the log piling technique as a sustainable, cost-effective, and environmentally friendly solution for reducing soil liquefaction risks during earthquakes. Although this method has been used extensively in Japan, mainly aiming for complete soil layer penetration, its economic viability is questionable in cases requiring very deep soil improvements. The study highlights that shallow ground improvement can notably enhance the seismic behavior of the soil-improvement-structure system, as evidenced by the reduced total and penetration settlements caused by liquefaction. The paper presents a methodology for determining the optimal dimensions of the modified ground zone using both small and medium-scale 1-g shaking table tests.&nbsp; The small-scale tests involve a detailed parametric study, examining variables like improvement width, pile spacing, and the depth-to-thickness ratio of the improved layer. Medium-scale tests, on the other hand, are geared towards identifying the minimum effective pile length. This approach provides a practical guideline for engineers to implement log piling for small residential buildings. Additionally, the paper utilizes finite element method (FEM) effective stress analysis, incorporating a PLAXIS 2D-based constitutive model (PM4Sand) calibrated with laboratory undrained cyclic torsional tests. This model accounts for the changes in effective stress during seismic activities. Finally, the study correlates its numerical findings with the results from the 1-g shaking table experiments, offering a well-rounded perspective on the effectiveness of log piling in mitigating liquefaction risks during seismic events &nbsp;

show abstract

Section: Introductionmentioning

confidence: 99%