拱形抗滑结构设计参数优化分析

Influence factors of the performance of the arch anti-slide structure

为了探究拱形抗滑结构设计关键参数的相互影响关系并获得最优的参数组合,采用有限元方法建立拱形抗滑结构加固的边坡计算模型,采用正交试验手段分析了拱脚约束(拱脚桩桩径扩大比)、拱形的矢跨比、桩间距、桩径这4个关键设计参数对拱形抗滑结构受力和变形的影响,并采用极差分析和方差分析方法对计算结果进行分析。结果表明:在综合考虑坡体的加固效果和工程造价时,各设计参数的最优取值拱脚桩桩径扩大比为1.25,拱形的矢跨比为0.14,桩间距的取值为3.5倍桩径。

To analyze the key parameters of the arch anti-slide structure and get the optimal combination of parameters,finite element method is applied to establish the numerical model of slope reinforced by anti-slide arch anti-slide structure.Based on the existing research,four key influence factors,such as the restriction at the arch,the arched span ratio,the spacing of piles and the diameter of pile,the mechanical properties and reinforcement effects of anti-sliding structures is analyzed by orthogonal test.The calculation results are analyzed by the difference analysis and variance analysis method,and the primary and secondary order of the influencing factors are determined.The results show that,considering the reinforcement effect and engineering cost of the slope,the optimal value of each factor level is:the expansion ratio of the arch pile diameter is 1.25,the span ratio of the arch is 0.14,and the value of the pile spacing is 3.5 times the diameter.