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对普通预应力混凝土管桩桩身加肋、沉桩过程中在桩侧填砂可有效提高桩基的承载能力。通过构建基于桩-土荷载传递模型来分析带肋填砂管桩的土层侧阻力与位移间的对应关系,确定桩-土荷载传递函数,进一步分析研究了带肋填砂管桩承载力的提高幅度。分析及实测结果均表明,相比普通管桩的侧阻力,带肋填砂管桩的土层侧阻力有较大幅度的提高。然后又通过荷载传递模型反推出各土层侧阻力屈服值及其对应的位移,为以后带肋填砂管桩的设计取值提供参考。同时还研究了带肋填砂管桩的侧阻、端阻所占的桩顶荷载的比例,及该比例与桩顶荷载之间的关系,结果表明此比例与桩顶荷载之间基本呈线性关系。
For ordinary prestressed concrete pipe pile body ribbed, pile filling process in the pile side can effectively improve the pile bearing capacity. By building a model based on pile-soil load transfer to analyze the corresponding relationship between the lateral resistance and displacement of the ribbed sand filled pipe pile, the pile-soil load transfer function is determined, and the bearing capacity Increase the rate. The analysis and measured results show that compared with the common lateral resistance of the pipe pile, the lateral resistance of the pipe with the ribbed sand filling pipe pile increases greatly. Then through the load transfer model, the yield resistance of each soil layer and its corresponding displacement are deduced, which can be used as a reference for the future design of ribbed sand filled pipe piles. At the same time, the relationship between the lateral resistance and the end load occupied by the side piles of the sand-filled sand-filled pipe pile and the load on the top of the pile are also studied. The results show that the ratio is basically linear with the top load of the pile relationship.