抗滑桩与桩顶弧形连系梁协同作用机理及计算分析  

The Mechanism and Calculation Analysis of Arc Row Piles with Arc Coupling Beam on Pile Top

作　　者：张志伟[1] 邓荣贵[1] 钟志彬[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《山地学报》2015年第1期72-80,共9页Mountain Research

基　　金：国家自然科学基金资助项目(No.41272321);高等学校博士学科点专项科研基金(20120184110023)~~

摘　　要：桩顶弧形连系梁通过约束桩顶位移,能够优化桩身的受力状态,且能提高抗滑桩的整体稳定性。与直线型连系梁相比,弧形连系梁的受力性能与拱形结构相似,以受压为主,能够充分发挥混凝土较高的抗压能力,通过抗滑桩及连系梁可将部分滑坡推力传递至滑体两侧稳定岩土体,降低了对滑床岩土体强度及抗滑桩桩身强度的要求。根据抗滑桩与连系梁之间的协同作用及变形协调,利用力法原理,建立柔度方程,求解桩顶与连系梁之间的约束冗力,进而计算连系梁及抗滑桩的内力和位移。通过算例表明,弧形连系梁较直线型连系梁内力分布均匀,与单桩及桩顶受直线型连系梁约束的排桩相比,弧形连系梁对抗滑桩的约束效果明显,而且约束效果随弧形连系梁矢跨比的增加而增强。The arc coupling beam can provide constraint to pile top,so moment and forces of pile body distribution is uniform,and the integrity stability of piles is improved. Compared with linear coupling beam,the arc coupling beam,which mainly sustains compression forces,can give full play of the high compressive capacity of concrete.Through the cooperation of arc coupling beam and the anti-slide piles,part of the landslide thrust can be transferred to both sides stabilized stratum,which decrease the resistance requirements of slide bed and the required strength of piles. By using the deformation compatibility between arc row piles and arc coupling beam,the flexibility equation is set up,and the redundant forces can be solved based on the flexibility equation,then the internal force and displacement of beam and piles is calculated. The results of an example show that the internal force distribution and the deformation of arc coupling beam is more reasonable than linear coupling beam. Compared with the cantilever row piles and the linear interval row piles with beam on the top of piles,the constraint effect provided to the piles by arc coupling beam is obvious,and the constraint effect is stronger with the increase of the span ratio of arc coupling beam.

关 键 词：弧形排桩 弧形连系梁 协同作用 内力分布 位移约束 

分 类 号：U417.1[交通运输工程—道路与铁道工程] TU753.3[建筑科学—建筑技术科学]