岩土工程学报2024，Vol.46Issue(z1)：11-15,5.DOI:10.11779/CJGE2024S10050
强震损伤格栅墙处理地基抗液化性能离心模型试验研究
Centrifuge model tests on liquefaction mitigation performance of soil-cement grid-improved ground subjected to earthquake pre-shaking history
摘要
Abstract
The soil-cement grid has been widely applied as an effective liquefaction countermeasure due to its capability to effectively mitigate the shear load and deformation of the enclosed soil under seismic loadings.In terms of its long service period,two dynamic centrifuge model tests are conducted to study the effects of strong shaking history on the liquefaction responses of the enclosed soil.The model ground consists of a 15 m-thick liquefiable clayey fine sand and an underlain 2.5 m-thick coarse sand layer.The liquefiable layer is improved by the soil-cement grid in one model,while the other without any improvement affording a contrast.Both models are subjected to a sinusoidal input motion with amplitude of 0.15g.Several more severe shaking events with amplitude of 0.4g are applied to the models prior to this 0.15g event as strong shaking history.The results imply that the damage patterns of the walls are mainly vertical penetrating cracks,partly accompanied by local diagonal cracks,and the outer cells show a"shielding effect"on the center cell similar to that of a group pile foundation.After the strong vibration history,the central cell of the soil-cement grid still has satisfactory anti-liquefaction effects,leading to a much lower excess pore pressure than free field.At the same time,due to the weakening of the overall stiffness of the soil-cement grid,the shear deformation between the soil-cement grid and the underlying coarse sand layer is significantly reduced.关键词
地震液化/水泥土格栅墙/地基处理/离心机模型试验/地震历史Key words
soil liquefaction/soil-cement grid/ground improvement/centrifuge model test/earthquake pre-shaking history分类
土木建筑引用本文复制引用
周燕国,曹渊,石川明,陈云敏..强震损伤格栅墙处理地基抗液化性能离心模型试验研究[J].岩土工程学报,2024,46(z1):11-15,5.基金项目
国家自然科学基金项目(51988101,52278374,51978613) （51988101,52278374,51978613）
高等学校学科创新引智计划(111计划)项目(B18047) （111计划）
