h型抗滑桩和悬臂式双排抗滑桩的力学特性分析

Analysis on Mechanical Characteristics of h-Type Anti-Slide Piles and Cantilevered Double-Row Anti-Slide Piles

为探索h型抗滑桩和双排抗滑桩中较优的抗滑结构形式,利用有限元软件MIDAS/GTS,分别建立了h型抗滑桩和双排抗滑桩的三维有限元分析模型,并对比分析了两种抗滑桩结构的桩身位移、内力分布以及坡体支挡效果。结果表明:1)h型抗滑桩与双排桩抗滑桩在桩身位移、内力均存在显著差异。在协调前、后排桩弯矩、剪力和减小桩身位移方面,h型抗滑桩较双排桩表现更优;2)h型抗滑桩支护后,较双排抗滑桩支护更显著,边坡稳定安全系数提高了21.8%、最大剪应变降低了63.6%;3)理论计算的h型抗滑桩前后排桩内力分布,较双排桩更合理,表明了h型抗滑桩协调内力的优势。

To explore a better anti-sliding structure between h-type anti-slide piles and cantilevered doublerow anti-slide piles,the finite element software MIDAS/GTS was used and the three-dimensional finite element analysis models for h-type anti-slide piles and cantilevered double-row anti-slide piles were constructed.Then,the displacement,internal force of piles and slope support effect of the two anti-slide pile structures were compared and analyzed.The results showed that:1)There were significant differences between the two types of anti-slide pile systems in terms of displacement and internal force of piles.Compared with cantilevered double-row anti-slide piles,h-type anti-slide piles were better to coordinate flexural moment and shear force of the front and rear piles,as well as displacement of piles.2)Compared with cantilevered double-row anti-slide piles,the support effect of h-type anti-slide piles was more significant.The safety factor of slope stability increased by 21.8%,simultaneously,the maximum shear strain decreased by 63.6%.3)Compared with the cantilevered double-row anti-slide piles,the theoretical calculations on internal force of the front and rear piles in the h-type anti-slide pile systems were more reasonable.It also showed the advantage of h-type anti-slide piles in coordination of the internal force.