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水泥搅拌桩和塑料排水板联合使用的组合型复合地基具有利用搅拌桩增强软土地基的强度,利用塑料排水板加快地基的固结进程的特点,因此对于处理深厚饱和软土地基具有很强的推广价值。由于其平面布置多为梅花形,整体上呈非对称性,其固结特性理论分析的难度较大。为了从理论上进行该组合型复合地基固结特性分析,本文首先针对其排水系统进行了合理的简化,根据固结分析模型建立了桩–板组合型复合地基的固结微分方程,并利用边界条件获得了该组合型复合地基固结分析的解析解;其次通过三维有限元计算结果和解析解的对比分析验证了该解析解的合理性和可行性;最后针对置换率、压缩模量和加固深度等影响因素的分析,探讨了该组合型复合地基的固结特性,为实际工程的应用提供理论指导。
The combined composite foundation used by the cement mixing pile and the plastic drainage board has the characteristics of using the mixing pile to enhance the strength of the soft soil foundation and using the plastic drainage board to accelerate the consolidation process of the foundation so that it has a strong Promote value. Due to its planar arrangement of mostly plum-shaped, as a whole was asymmetric, the theoretical analysis of the consolidation characteristics of its more difficult. In order to theoretically analyze the consolidation characteristics of the composite foundation, this paper first simplifies the drainage system and establishes the consolidation differential equation of the composite foundation with pile-slab according to the consolidation analysis model, and makes use of the boundary The analytic solution of the consolidation analysis of the composite foundation is obtained. Secondly, the rationality and feasibility of the analytical solution are verified through the comparison and analysis of the three-dimensional finite element analysis and the analytical solution. Finally, according to the substitution rate, compressive modulus and reinforcement Depth and other influencing factors, discusses the consolidation characteristics of the composite foundation, and provides theoretical guidance for the practical engineering application.