变附加应力条件下考虑桩体二维井阻作用的复合地基固结解析理论研究

发布时间：2019-01-21 21:25

【摘要】：通过在现有解的形式基础上增加一个二次多项式,提出一种新的复合地基固结解的形式及解答方法,推导得到地基附加应力既随时间变化也随深度变化条件下考虑桩体竖向及径向二维井阻作用的散体材料桩复合地基固结解析解,通过退化、与已有解的比较等方法对解进行分析验证。结果表明,现有的瞬时荷载下考虑桩体径竖向渗流的解、考虑桩体竖向渗流与变形协调的解、太沙基一维固结解等都是本文解的特例,这说明本文解的正确合理性。地基加载历时越长,固结越慢;地基底部附加应力越小,固结越快;考虑桩体径竖向二维井阻时地基固结比只考虑竖向井阻时慢,桩径比越小,桩体渗透系数越小,两者的差异越大。本文解的表达形式及解答方法,为复合地基固结度的求解提供一种新的思路,发展和完善了现有的复合地基固结理论。
[Abstract]:By adding a quadratic polynomial to the existing solutions, a new form of consolidation solution for composite foundation and its solution method are proposed. The analytical solution of consolidation of composite foundation of bulk material pile considering the vertical and radial well resistance of pile body is derived under the condition that the additional stress of the foundation changes with both time and depth, and the consolidation solution of the composite foundation is obtained by degradation. Compared with the existing solutions, the solutions are analyzed and verified. The results show that the solution of vertical percolation of pile body and the solution of coordination of vertical seepage and deformation of pile body are considered under the instantaneous load. The one-dimensional consolidation solution of Terzaghi is the special case of this solution, which shows that the solution in this paper is correct and reasonable. The longer the loading duration of the foundation, the slower the consolidation, the smaller the additional stress at the bottom of the foundation, the faster the consolidation. When the vertical two-dimensional well resistance of pile is considered, the consolidation ratio of foundation only takes into account the slow time of vertical well resistance, the smaller the ratio of pile to diameter, the smaller the permeability coefficient of pile, and the greater the difference between them. The expression form and solution method of the solution in this paper provide a new way of thinking for solving the consolidation degree of composite foundation, and develop and perfect the existing consolidation theory of composite foundation.
【作者单位】：云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室;
【基金】：云南省交通运输厅科技计划项目(2015(A)12,[2014]231号(一))~~
【分类号】：TU470

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