桩-土相互作用支护桩受力变形计算方法

发布时间：2018-02-04 02:02

本文关键词： 桩-土相互作用深基坑变形计算现场实测　出处：《西南交通大学学报》2016年01期 　论文类型：期刊论文

【摘要】：为研究桩-土非线性相互作用对深基坑支护结构内力与位移的影响,提出了一种桩-土相互作用支护桩受力变形计算的方法.该方法将基坑开挖面以上的桩体视为有限数量的弹性体,开挖面以下的桩体视为Winker地基梁,支撑结构为二力杆弹簧,并考虑支护桩和内支撑的变形协调,基于桩结构分段分坐标法和弹性地基梁法,推导出了考虑桩-土-内支撑共同作用的支护桩体挠曲微分方程.结合理论土压力,采用该方程计算获得了不同开挖深度的桩体水平位移和桩体弯矩,并与规范法、实测值进行比较.结果表明:本文方法计算得到的支护桩最大水平位移比规范法小15.2%,最大弯矩较规范法小26.6%,均与实测值更为相近.
[Abstract]:In order to study the influence of pile-soil nonlinear interaction on the internal force and displacement of deep foundation pit supporting structure. A method for calculating the stress and deformation of pile supported by pile-soil interaction is presented, in which the pile above the excavation surface is regarded as a finite number of elastic bodies, and the pile below the excavated surface is regarded as a Winker foundation beam. The supporting structure is a two-force rod spring, considering the deformation coordination between the supporting pile and the inner bracing, based on the sectional coordinate method of the pile structure and the elastic foundation beam method. The differential equation of deflection of supporting pile considering the interaction of pile-soil-internal bracing is derived. Combined with theoretical earth pressure, the horizontal displacement and bending moment of pile with different excavation depth are calculated by the equation. The results show that the maximum horizontal displacement of supporting pile calculated by this method is 15.2 less than that of the standard method, and the maximum bending moment is 26.6% less than that of the standard method. All of them are closer to the measured values.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家自然科学基金重点项目(U1261212);国家自然科学基金青年科学基金资助项目(51508556) 北京高等学校青年英才计划资助项目(YETP0944) 中央高校基本科研业务费专项资金资助项目(2009QL02)
【分类号】：TU435
【正文快照】： 基坑支护问题一直是岩土工程界的一个研究热点.早在20世纪40年代就有学者基于基坑支护问题提出了一些著名的计算理论,如Terzaghi-Peck表观土压力理论[1-2]等,并在基坑支护设计计算方面得到了应用.国内外很多专家学者也在这个领域做了大量有意义的研究工作:文献[3]利用现场实测

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