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GRF基础是一种新型桩基础,首先开发应用于日本,与普通直桩相比,该基础不仅可以节约材料、降低成本,而且可以大幅度地提高承载力,具有广阔的应用前景。通过模型试验,分析了锚杆间距、锚杆长度以及锚杆数量对GRF基础承载力的影响,初步探讨了GRF基础的承载机制。得到以下结论:GRF基础的承载性状和直桩不同;锚杆不仅可以提高GRF基础的侧阻力,在一定程度上对端阻力也有增强作用;在相同的桩顶荷载作用下,GRF基础的位移远小于直桩的位移;与同体积的大直径桩相比,GRF基础可以大幅度地提高基础承载力、减少沉降;在一定的锚杆间距范围内,锚杆间距对极限承载力的影响较小,但对极限侧阻力影响较大;存在一个锚杆临界长度,当锚杆长度为临界值时,锚杆利用效果最佳;GRF基础的极限承载力随锚杆数量而变化,适当地增加锚杆数量,可以获得满意的承载力增量。
The foundation of GRF is a new type of pile foundation, which is firstly developed and applied to Japan. Compared with common straight piles, this foundation not only saves materials and reduces costs, but also can greatly improve the bearing capacity and has broad application prospects. Through the model test, the influence of anchor spacing, anchor length and bolt number on the basic bearing capacity of GRF was analyzed, and the bearing mechanism of GRF foundation was discussed preliminarily. The following conclusions are obtained: The bearing behavior of GRF foundation is different from that of straight pile; the anchor rod not only enhances the lateral resistance of GRF foundation, but also enhances the end resistance to a certain extent; under the same pile top load, the displacement of GRF foundation is far Is smaller than the displacement of straight pile. Compared with the same volume of large diameter pile, GRF foundation can greatly improve the foundation bearing capacity and reduce the settlement; within a certain range of anchor spacing, the effect of anchor spacing on the ultimate bearing capacity is small , But a greater impact on the limit side of the resistance; there is a critical length of the anchor, when the anchor length is the critical value, the best use of anchor; GRF foundation bearing capacity with the number of anchors, appropriate to increase the anchor The number of rods, you can get a satisfactory incremental capacity.