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GRF桩基础是一种新型岩土增强型桩基础,它在大直径桩周围分层、辐射状分布锚杆来改善桩—土相互作用机理。利用岩土计算软件FLAC3D,建立三维非线性模型,考虑桩—土、锚杆—土的接触效应,分析研究了桩侧土体、锚杆及桩端土体变形机制,并与等直径直桩进行对比。数值计算结果表明:由于锚杆的存在,GRF桩基础桩周土体变形明显小于直桩的桩周土体变形,且桩侧土体变形表现出了不同的变形趋势。锚杆的变形会随着荷载的增大而增大,且在相同荷载作用下不同埋置深度锚杆变形也不同。
The GRF pile foundation is a new type of geotechnical reinforced pile foundation, which delaminates around the large diameter pile and distributes the anchor rod radially to improve the pile-soil interaction mechanism. Using the rock software FLAC3D, a three-dimensional nonlinear model is established, considering the contact effect of pile-soil and anchor-soil, the deformation mechanism of soils, anchors and pile-ends is analyzed and studied. comparing. The numerical results show that the deformation of soil around the pile foundation of GRF pile is obviously smaller than that of the straight pile due to the existence of anchor rod, and the soil deformation of pile side shows different deformation tendency. The deformation of anchor rod increases with the increase of load, and the deformation of anchor rod with different embedment depth is also different under the same load.