预加力对锚拉式抗滑桩影响分析  

Influence Analysis of Pre-stressing on Anti-slide Piles with Prestressed Anchor Cables

作　　者：王子全 刘京安 万虹宇[2] 王尉行 丁震 Wang Ziquan;Liu Jing an;Wan Hongyu;Wang Weixing;Ding Zhen(CISDI Engineering Corporation,Chongqing 400013,China;Chongqing University of Science and Technology,401331,China)

机构地区：[1]重庆赛迪工程咨询有限公司,400013 [2]重庆科技学院,401331

出　　处：《特种结构》2022年第5期12-16,共5页Special Structures

摘　　要：市政、建筑等行业的边坡及基坑工程,大量采用锚拉式抗滑桩。梳理锚拉式抗滑桩变形控制的相关规定,比较预加力与锁定值的异同,研究预加力取值对锚拉式抗滑桩变形和内力的影响,总结锚拉式抗滑桩设计流程。研究表明,对未做相关规定的地区,可参考《建筑地基基础设计规范》(GB50007—2011)第5.3.4条进行变形控制。预应力锚索设计及选定通过迭代计算确定,迭代计算最终选定的预加力值即为锚索锁定值。通过施加预加力,可以有效减小变形。随着预加力的增加,桩身弯矩和剪力逐渐减小,嵌固段土反力逐渐减小。当预加力等于(0.75~0.80)锚拉力时,桩嵌固段最大弯矩、剪力与外露段最大弯矩、剪力接近,此时桩身配筋最经济。Anti-slide piles with prestressed anchor cables are widely used in the municipal construction of slopes and foundation pits.In this paper,relevant standards on deformation requirements of the anti-slide piles with prestressed anchor cables were reviewed,the similarities and differences between pre-stress and locking value were compared,the influence of pre-stress on pile deformation and stress were studied,and the design procedures of the anchored anti-slide piles were then summarized.The research shows that in the areas without relevant regulations,the deformation control can refer to the section 5.3.4 of GB 50007—2011.The pre-stress value selected by iterative calculation is the anchor cable locking value.Applying pre-stressing can effectively reduce the deformation.With the increase of pre-stress value,the bending moment and shear force of the pile decrease gradually,and the soil reaction also decreases gradually.When the pre-stress is equal to(0.75~0.80) times of anchor axial force,the maximum bending moment and shear force of the embedded pile section are close to those of the exposed section.At this time,the reinforcement of the pile is the most economical.

关 键 词：预加力 锚拉式抗滑桩 变形控制值 锁定值 

分 类 号：TU473.1[建筑科学—结构工程]