旋转触探确定钻孔灌注桩极限承载力研究

发布时间：2018-07-29 06:29

【摘要】：研究目的:旋转触探是一种新型原位测试技术。在相继完成方法设计、设备研制和试验测试和试生产后,为探索旋转触探试验在钻孔灌注桩设计中的应用,依据京津城际、京沪线等项目钻孔灌注桩桩身内力测试成果,开展利用旋转触探确定钻孔灌注桩极限承载力的研究。研究结论:(1)提出的旋转触探特征量——旋转触探比功的概念,可应用于后续的对比分析工作;(2)可利用旋转触探试验确定钻孔灌注桩极限承载力的估算,并根据收集的钻孔灌注桩桩身内力测试成果,对公式中修正系数进行拟合;(3)经实例验证,应用旋转触探公式能有效估算钻孔灌注桩极限承载力;(4)本研究成果可为桩基设计提供参考,同时对推动旋转触探新技术在岩土工程中的应用具有指导和借鉴作用。
[Abstract]:Objective: rotating penetration is a new in-situ testing technique. In order to explore the application of rotary penetration test in the design of bored pile, after the completion of method design, equipment development, test and trial production in succession, according to the test results of internal force of bored pile in Beijing-Tianjin inter-city, Beijing-Shanghai line and other projects, A study on the determination of ultimate bearing capacity of bored pile by rotary penetration is carried out. The research conclusions are as follows: (1) the concept of rotating penetration specific work, which is the characteristic quantity of rotary penetration, can be applied to the subsequent comparative analysis, and (2) the estimation of ultimate bearing capacity of bored pile can be determined by rotating penetration test. And according to the collected results of internal force test of bored pile body, the correction coefficient of the formula is fitted. (3) verified by an example, The application of rotary penetration formula can effectively estimate the ultimate bearing capacity of bored cast-in-place pile. (4) the research results can provide a reference for the design of pile foundation and guide and reference the application of the new technology of rotary penetration in geotechnical engineering.
【作者单位】：铁道第三勘察设计院集团有限公司;
【分类号】：TU473.1

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