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嵌岩桩充分利用岩石作为持力层,是桥梁工程的重要基础结构型式之一。考虑到地基岩石土质与实际差异性,论文依据某桥梁嵌岩桩设计,提出了基桩静载试验以掌握和验证桩基础施工工艺和力学性能的方法。首先设计了基桩水平静载试验方案,明确了试验装置、测点布设和荷载确定等方法,并通过数值有限元模型分析了试验荷载下桩体变形、受力及桩身土压力分布等特性。分析表明:80%极限荷载下,桩体转角仅1/2500,侧向土压力在100KPa以内,整体应力满足要求,说明基岩的嵌固效果良好,试验桩整体安全性良好。有限元分析结果可以为现场试验提供直接参考,基桩试验方案可为类似工程提供借鉴。
Rock-filled piles make full use of rock as a holding layer, which is one of the important basic structural forms of bridge engineering. Considering the difference between the soil and the actual rock foundation, this paper presents a method to test and verify the pile foundation construction technology and mechanical performance based on the design of a rock-socketed pile. First of all, the paper designed the horizontal static load test program of pile, clarified the test device, the layout of measuring points and the method of load determination, and analyzed the deformation, force and the distribution of earth pressure under the test load by numerical finite element model . The analysis shows that under 80% ultimate load, the corner of the pile is only 1/2500 and the lateral earth pressure is less than 100KPa. The overall stress meets the requirements, indicating that the embedded effect of bedrock is good and the overall safety of the test pile is good. The results of finite element analysis can provide a direct reference for the field test, and the pile test program can provide reference for similar projects.