承台微型桩系统加固土质滑坡设计计算方法研究

发布时间：2018-02-27 16:52

本文关键词： 承台微型桩极限弯矩 FLACD 荷载分担比桩间距　出处：《中外公路》2017年04期 　论文类型：期刊论文

【摘要】：通过文献调研阐明微型桩发展历史,对微型桩的分类和内力计算方法进行总结;提出加筋微型钢管混凝土桩极限弯矩可按GJB 4142-2000规程中纯弯钢管混凝土构件计算,加筋等效为含钢率,基于FLAC3D软件对其进行数值模拟试验验证;借鉴国内外关于钢管混凝土组合结构纯弯构件设计理论,对该文研究的微型单桩极限弯矩进行计算,得出几种规程下的极限弯矩设计值。鉴于承台内桩间距合理取值问题,以3×3桩组成的9桩承台结构进行数值模拟试验研究,通过调整桩间距得出各桩结构内力的数值解,对数值解进行拟合分析,得出各桩结构内力变化趋势和荷载分担比,从而确定合理桩间距。最后,结合工程实例验证所得研究成果的准确性,以期该研究成果对承台微型桩设计起到一定的参考作用。
[Abstract]:The development history of micro pile is explained through literature investigation, the classification and internal force calculation method of micro pile are summarized, and the ultimate bending moment of reinforced micro steel tube concrete filled steel tube pile can be calculated according to GJB 4142-2000 code. The reinforcement is equivalent to the steel content, which is verified by numerical simulation test based on FLAC3D software, and the ultimate bending moment of the miniature single pile studied in this paper is calculated by referring to the design theory of pure bending members of concrete-filled steel tubular structures at home and abroad. The design value of ultimate bending moment under several regulations is obtained. In view of the reasonable value of pile spacing in pile cap, the numerical simulation study is carried out on 9 pile cap structures composed of 3 脳 3 piles, and the numerical solution of internal force of each pile structure is obtained by adjusting the pile spacing. By fitting and analyzing the numerical solution, the variation trend of internal force and load-sharing ratio of each pile structure are obtained, so as to determine the reasonable pile spacing. Finally, the accuracy of the research results is verified by combining the engineering examples. The research results can be used as reference for the design of pile cap.
【作者单位】：贵州省交通规划勘察设计研究院股份有限公司;贵州大学资源与环境工程学院;喀斯特环境与地质灾害防治教育部重点实验室;
【分类号】：P642.22;TU473.1

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