关键词: 桩网复合地基, 循环荷载, 归一化累积沉降, 桩身应变, 桩土荷载分担比

Abstract: To study the axial deformation characteristics of pile-net composite foundation under the traffic load, a model tests of the pile-net composite foundation were performed under the cyclic loading. The influence of the load frequency on the normalized cumulative settlement of the pile-net composite foundation, pile strain and pile-soil load sharing ratio are analyzed. The results show that the normalized cumulative settlement, the pile strain and the pile load sharing ratio of the pile-net composite foundation increased with the increase of the number of cyclic cycles. The normalized cumulative settlement and the pile strain of pile-net composite foundation is mainly concentrated in the early stage, and the increase slowly in the later period. With the increase of the load frequency, the normalized cumulative settlement and the pile strain of pile-net composite foundation increased, and the load transferred from soil between piles to the pile top. The research results can provide a basis for the design and construction of the pile-net composite foundation under the traffic load.

Key words: Pile-Net Composite Foundation, Cyclic Loading, Normalized Cumulative Settlement, Pile Strain, Pile-Soil Load Sharing Ratio