CHEN Zhixiong,PAN Xiaodong,CHEN Yumin,et al.Research on Efficacy of Rigid⁃drainage Pile Improvement on Liquefiable Sloping Ground by Shaking Table Tests[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(01):12-20.
CHEN Zhixiong,PAN Xiaodong,CHEN Yumin,et al.Research on Efficacy of Rigid⁃drainage Pile Improvement on Liquefiable Sloping Ground by Shaking Table Tests[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(01):12-20. DOI: 10.13409/j.cnki.jdpme.2021.01.002.
Research on Efficacy of Rigid⁃drainage Pile Improvement on Liquefiable Sloping Ground by Shaking Table Tests
Rigid-drainage pile is an effective anti-liquefaction treatment measure for foundations, which combines the bearing capacity of rigid pile and the drain-ability of gravel pile. At present, however, there is still a lack of research on the performance of rigid-drainage pile reducing lateral displacement of liquefied sand, which limits its popularization and application. To investigate the efficacy of rigid-drainage pile improvement on liquefiable sloping ground, the response of excess pore water pressure, flow properties of liquefied sand, and lateral permanent displacement of the pile head were measured based on shaking table tests. The results were compared with those of ordinary pile tests, and the effect of pile arrangement patterns was considered. The results indicate that: the rigid-drainage pile is an effective treatment measure to reinforce liquefiable sloping ground, which can better restrict liquefaction-induced lateral flow. With the same pile arrangement pattern, the rigid-drainage pile has better effect in restraining the flow and deformation of liquefied sand than the ordinary pile, and this effect is more obvious at the slope crest. For ordinary piles, the triangular pile arrangement pattern is more effective in restricting lateral flow than the square pile arrangement pattern, but the difference is not obvious for rigid-drainage piles.
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