柔性桩复合地基中软土侧向挤出的影响因素

Influencing factors of lateral extrusion on soft soil in composite foundation with flexible columns

为定量探讨柔性基础下柔性桩复合地基中软土侧向挤出的影响因素,在合理假设的基础上,将桩土复合加固区与变形影响深度范围内的天然地基视为一个整体,构造满足位移边界条件的位移分量表达式,提出柔性基础下柔性桩复合地基变形分析的近似方法,导出地基土竖向和侧向变形计算的近似解析算式,并利用Matlab软件编制相应的计算程序,分析软土侧向挤出的影响因素。进行均布荷载作用下夯实水泥土桩复合地基模型实验,并将实测值、理论值、复合模量法所获得的结果进行对比,验证所提出方法的适用性。

To quantitatively study the influencing factors of lateral extrusion on soft soil in composite foundation with flexible column with flexible foundation, based on some logical assumes, the pile-soil composite reinforced area and the natural ground among the influencing depth scope of deformation were regarded as a whole, the corresponding displacement component formula which satisfy the displacement boundary conditions were constructed, and an approximate method for analyzing the deformation of composite foundation with flexible columns with flexible foundation was proposed, the approximate analytical formula of the foundation vertical and lateral displacement were derived, and the correlated program was also developed by Matlab software, and the influencing factors of lateral extrusion on soft soil were analyzed by this method. In order to validate the feasibility of the proposed approach, the modeling tests on the composite foundation with the rammed soil-cement tapered columns under uniform load were performed, the corresponding results was compared with its theoretical results and the results are calculated by composite modulus method, which validates the applicability of the proposed approach.