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在传统的复合地基固结理论中,等应变条件和桩土流量连续的假设之间存在着不一致的地方。为此,抛弃了桩土界面上水流量相等的假设,考虑了桩体径向渗流引起的桩体固结和变形,同时考虑了桩体施工扰动而造成的扰动区土体水平渗透系数抛物线分布的特点,给出了此类固结问题的控制方程和解答以及复合地基固结度的表达式,并对复合地基固结度的解进行了讨论,可以看出无论井径比(影响区半径和桩体半径之比)趋于1或无穷大,本文固结解均能退化到Terzaghi天然地基一维固结的解答。最后对本文的解和以往的解做了比较,结果表明:本文解给出的地基固结度比考虑扰动区土体水平渗透系数为直线变化或者保持不变的解给出的固结度更大;随着井径比的减小,本文解和以往的解得到的固结度差值变大。
In the traditional theory of consolidation of composite foundations, there are inconsistencies between the assumption of equal strain and the assumption of continuous flow of pile-soil. For this reason, the assumption of equal water flow at pile-soil interface is discarded, the consolidation and deformation of pile body caused by radial seepage of pile body are considered, and the parabola distribution of horizontal permeability coefficient of soil body in disturbance zone is taken into account. The governing equations and solutions of such consolidation problems and the expressions of the consolidation degree of the composite foundation are given. The solution of the consolidation degree of the composite foundation is discussed. It can be seen that no matter the ratio of the borehole diameter And the radius of the pile body) tends to 1 or infinity, the consolidation solution of this paper can degenerate to one-dimensional consolidation of Terzaghi natural foundation. Finally, the solution to this paper is compared with the previous one. The results show that the consolidation degree given in this paper is more stable than the solution considering that the horizontal permeability coefficient of the soil in the disturbance zone is linear or constant With the decrease of the ratio of borehole diameter, the difference between the solution and the previous solution becomes larger.