摘要
设计并完成可液化场地单桩小型振动台模型试验。试验单桩长径比分别为40∶1和50∶1,场地为饱和南京细砂构成的水平和倾斜2种场地类型。考虑桩顶是否附加结构和桩底是否嵌固2种约束条件。结果表明:增大桩的长径比、桩底嵌固、桩顶附加结构能够显著增大桩顶的加速度反应以及桩身的应变反应;桩顶加速度以及桩身弯曲应变均呈现随场地液化过程而变的阶段性反应特征;液化倾斜场地的流滑将加大模型桩的动力反应,流滑对桩身的推动作用使桩顶加速度反应出现明显不对称现象,且显著改变了桩身应变分布形态。
A series of small shaking table tests on single piles in liquefiable sand site were designed and completed. The slenderness ratios of piles were 40：1 and 50：1 respectively, and the liquefiable sites were inclined or horizontal sites composed of saturated Nanjing fine sands. Two different constraint conditions if cap and bottom of piles fixed were considered. Results showed that by increasing slenderness ratio of pile fixing pile bottom and additional structure on the top of the pile could obviously increase the acceleration response of pile top and the strain of pile body, which vary with the process of sit liquefaction. The flow slide of liquefied slope increased the dynamic response of model piles. The push impact of flow slide caused obvious asymmetric acceleration response at the top of piles and changed the strain distribution on pile bodies.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2013年第6期5-10,共6页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金(50908114,501108235)
江苏省自然科学基金(BK2011802)
关键词
液化
倾斜场地
单桩
流滑推桩
振动台试验
liquefaction
inclined site
single pile
flop slide
shaking table test
