摘要
以福建省浦城高速公路某滑坡治理工程为例,利用ABAQUS有限元软件,分别建立圆形与矩形截面门架式抗滑桩的三维数值分析模型,考虑桩-土相互作用,采用滑带土强度折减有限元方法,对比分析两种截面桩的受力和变形特性。以圆截面桩为例探讨了桩身材料以及桩顶连系梁的刚度对桩身位移和内力的影响。分析表明：相同截面积和埋深情况下,圆形门架桩抗滑能力优于矩形门架桩,而且能有效减少配筋;对于门架式抗滑桩滑坡推力不仅可通过连系梁从后桩传递至前桩,而且会通过桩间土来传递,现行简化分析方法中无法合理考虑,因此应尽量采用三维数值模拟方法进行分析;抗滑桩桩体采用高强混凝土的意义不大;在保证前后桩可靠连接的条件下,连系梁不宜太厚,可取0.5-1.0倍桩的截面高度。
The finite element model of H shaped anti-landslide caissons with circular and rectangular sections were respectively established using the proiect information of Pucheng Expressway. The soil-caisson interaction effect are analyzed and the sliding band was simulated using strength reduction method. The two different section caissons are numerically compared. The results indicate that, under the same section area and emhedment depth, circular caisson have a better performance over that of caissons with rectangular sections. Therefore, less reinforcement bars can be used in the circular caisson. The H shaped caisson can transfer the thrust at the rare caisson to the front one through the soil in between the caissons, in addition to the load transfer through the connecting beam. However, this soil-structure interaction effect was not considered in the simplified design. The results also indicate that the anti-landslide caissons have no significant advantage by using the high strength concrete. The thickness of the connection beam cannot to be too thick and the optimum section height is between 0.5 and 1.0 caisson diameter.
出处
《土工基础》
2016年第3期328-332,共5页
Soil Engineering and Foundation
基金
福建省交通厅资助项目(20130002)
关键词
滑坡
门架式抗滑桩
三维数值分析
位移
内力
Landslide
H Shaped Anti-Landslide Caissons
Three Dimensional Numerical Analysis
Displacement
Internal Force
