Centrifuge model tests on piled raft foundation in sand subjected to lateral and moment loads
Centrifuge model tests on piled raft foundation in sand subjected to lateral and moment loads
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DOI：
10.1016/j.sandf.2014.02.005
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发表时间：
2014-04
影响因子：
3.7
通讯作者：
K. Sawada;J. Takemura
中科院分区：
文献类型：
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作者：
K. Sawada;J. Takemura
桩筏基础是桩筏共同作用的一种合理、经济的基础体系。然而，由于筏板-地基-桩之间复杂的相互作用，桩筏基础在水平荷载作用下的性状至今尚未得到很好的研究。对三种地基模型进行了一系列水平静载试验，桩筏、群桩和单独筏模型，使用土工离心机。研究了较大弯矩荷载和转动对水平荷载作用下桩筏基础整体性能的影响。通过离心模型试验发现，水平荷载作用下桩筏基础和群桩基础的竖向位移是不同的，这种竖向位移对水平荷载作用下桩筏基础的工作性能有显著影响。桩筏基础中桩体部分的水平阻力比群桩基础中的水平阻力大，这是由于筏板接触压力的作用。水平荷载作用下基础的竖向位移影响桩的竖向抗力，导致桩筏基础和群桩基础的弯矩抗力发挥不同。
Piled raft foundation has been widely recognized as a rational and economical foundation system with the combined effects of raft and piles. However, the behavior of laterally loaded piled raft foundation has not been well understood due to the complicated interaction of raft–ground–piles. A series of static horizontal loading tests were carried out on three types of foundation models, i.e., piled raft, pile group and raft alone models, on sand using a geotechnical centrifuge. In this paper, the influences of relatively large moment load and rotation on the overall performance of laterally loaded piled raft foundation were examined. From the centrifuge model tests, it is found that the vertical displacement due to horizontal loads is different between piled raft and pile group foundation, and this vertical displacement has significant influences on the performance of laterally loaded piled raft foundation. The horizontal resistance of the pile part in the piled raft foundation is higher than those observed in the pile group foundation due to raft base contact pressure. The vertical displacement of the foundation due to the horizontal loads affects the vertical resistances of piles, which results in the different mobilization of moment resistances between the piled raft and pile group foundations.