考虑桩侧土体非线性的静荷载作用下的单桩沉降时间效应研究

doi:10.13722/j.cnki.jrme.2014.0457

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摘要采用双曲线模型模拟桩侧土体的非线性，研究成层地基中静荷载作用下单桩沉降的时间效应，以及沉降稳定之后的桩身侧摩阻力和桩身轴力的分布情况。首先，将桩身自上而下划分为有限个单元段，采用基于行波分解的波动分析程序，推导出静荷载作用下任意时刻桩身任意位置处的位移方程；然后采用参数分析的方法，分析桩–土参数对单桩沉降性状的影响；最后模拟基桩静载荷试验的s-lgt曲线和q-s曲线，并与实测数据进行对比。结果表明：静荷载作用下单桩沉降的时间效应十分明显，建立的模型能够较好地模拟单桩在静荷载作用下的沉降性状。

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关键词 ：土力学, 单桩沉降, 时间效应, 侧摩阻力, 桩身轴力, 波动分析程序

Abstract：The nonlinear elastic nature of surrounding soil of pile was simulated with a hyperbolic model，and the time effect of the settlement and the distribution of pile shaft resistance and the axial force of a single pile under static loading were investigated. The pile shaft was divided into finite segments from the head to the toe. The settlement of any pile segment at any moment was deduced with the program of wave equation analysis based on the decomposition of traveling wave. The parametric study was conducted to analyze the influence of pile-soil parameters on the settlement behavior of a single pile. The theoretical calculated s-lgt and q-s curves were compared with the testing results. The results demonstrated that the solutions simulated well the settlement behavior of a single pile under static loading.

Key words： soil mechanics settlement of single pile time effect pile shaft resistance axial force in pile program of wave equation analysis

引用本文:

李振亚1，2，王奎华1，2，吕述晖1，2，庾焱秋1，2. 考虑桩侧土体非线性的静荷载作用下的单桩沉降时间效应研究[J]. 岩石力学与工程学报, 2015, 34(05): 1022-1030.
LI Zhenya1，2，WANG Kuihua1，2，LU Shuhui1，2，YU Yanqiu1，2. TIME EFFECT OF SETTLEMENT OF SINGLE PILE UNDER STATIC LOADING CONSIDERING NONLINEAR CHARACTERISTICS OF SOIL AROUND PILE. , 2015, 34(05): 1022-1030.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0457 或 http://www.rockmech.org/CN/Y2015/V34/I05/1022

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