底部抽真空预压法砂井地基固结解析解

发布时间：2019-02-28 07:01

【摘要】：基于谢康和等应变条件砂井地基固结理论和Hansbo砂井固结理论,考虑底部抽真空预压法加固方法中真空作用面位于固结土层底部的实际边界条件,推导出忽略竖向渗流情况下的底部真空预压加固地基固结方程解析解答。根据超孔压固结方程形成过程以及其解析解表达式,分析其与一般负压径向固结解答的区别。通过室内模型试验实测数据与解析模型计算结果的对比表明,不同位置处孔压和固结度计算值与实测结果吻合较好,从而验证了该模型的合理性,同时运用该模型也可有效验证已有关于底部抽真空室内模拟及现场原位试验结果。底部抽真空轴对称固结解析解可为底部抽真空技术的实际工程应用提供基础性的理论支持,推动底部抽真空技术的大规模推广应用。
[Abstract]:Based on Xie Kanghe's consolidation theory of sand well foundation under equal strain condition and Hansbo's consolidation theory of sand well, the actual boundary condition of vacuum acting surface located at the bottom of consolidated soil layer in the method of bottom vacuum preloading is considered. An analytical solution to the consolidation equation of foundation reinforced by vacuum preloading under the condition of neglecting vertical seepage is derived. According to the forming process of the super-pore pressure consolidation equation and the expression of its analytical solution, the difference between the super-pore pressure consolidation equation and the general negative pressure radial consolidation solution is analyzed. Through the comparison between the measured data of indoor model test and the calculated results of analytical model, it is shown that the calculated values of pore pressure and degree of consolidation at different locations are in good agreement with the measured results, thus validating the rationality of the model. At the same time, the model can also be used to verify the results of laboratory simulation and in-situ test of bottom vacuum pumping. The analytical solution of axisymmetric consolidation of the bottom pumping vacuum can provide the basic theoretical support for the practical engineering application of the bottom vacuum pumping technology and promote the large-scale popularization and application of the bottom vacuum pumping technology.
【作者单位】：河海大学
【基金】：中央高校基本科研业务费专项资金资助(No.2014B04914)
【分类号】：TU472.33

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