桩板墙支挡高填方路堤的结构特性与参数优化分析
Structural Characteristics and Parameter Optimization Analysis of Pile-Sheet Wall Retaining High Fill Embankment

本文结合郑西高速FK1 + 300~FK1 + 338段路基的实际条件建立了数值分析模型，研究了桩板墙在高填方路基中应用的可行性，并讨论了设桩参数的影响。结果表明，该路段采用桩板墙进行支挡时，路基具有良好的结构特性和足够的安全系数，设计方案下抗滑桩呈弹性桩，其悬臂段存在负弯矩区；随抗滑桩锚固段长度增加，路堤变形减小、安全系数增大，但存在最大有效锚固长度；在工程常用截面尺寸下，路堤的安全系数基本相同。
In this paper, based on the actual conditions of the section FK1 + 300~FK1 + 338 subgrade of Zhengzhou-Xi’an Expressway, a numerical analysis model is established to study the feasibility of the application of pile-sheet wall in high fill subgrade, and the influence of pile setting parameters is discussed. The results show that the subgrade has good structural characteristics and sufficient safety factors when the pile-sheet wall is used for retaining in this section. The anti-slide pile is elastic under the design scheme, and there is a negative bending moment zone in its cantilever section; the embankment deformation decreases and the safety factor increases with the increase of the length of the anti-slide pile anchorage section, but there is a maximum effective anchorage length. Under the common section size of the project, the safety coefficient of the embankment is basically the same.