桩基支挡结构锚固段长度最优值计算方法  

Calculation Method for Optimal Anchor Length in Pile Foundation Retaining Structures

作　　者：李伯根 吕婷 杨祥容 LI Bogen;LV Ting;YANG Xiangrong(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2024年第4期24-29,共6页High Speed Railway Technology

摘　　要：本文介绍了一种桩基支挡结构锚固段长度最优值计算方法,以解决解析法在计算锚固段最优长度时的局限性和数值计算软件中缺乏相应设计功能的问题。该方法基于数值计算方法,将桩基支挡结构等效为梁单元,将锚固段地层等效为弹簧单元。根据锚固段长度和地基变形量的变化规律,利用二分法思想迭代求解地基最大变形量为容许变形量时的锚固段长度,从而获得最优锚固长度以及对应的结构内力和变形信息。该方法适用于单层和多层地层中的桩基支挡结构,以及抗滑桩、锚索桩、椅式桩和锚索椅式桩等多种形式的支挡结构。与传统的解析方法相比,该方法能够统一处理不同地层和结构形式下的计算问题,避免了解析方法难以获得解析解的问题,并且计算过程简单明了,适合实际工程中的程序化应用。This paper presented a calculation method for determining the optimal anchor length in pile foundation retaining structures,addressing the limitations of analytical approaches in computing the optimal anchor length and the absence of pertinent design functions in numerical computation software.The proposed method,grounded in numerical techniques,equates the pile foundation retaining structure to girder elements and the anchored soil layer to spring elements.By examining the variation patterns of anchor length and ground settlement,it employs a dichotomy-inspired iterative process to ascertain the anchor length that yields the maximum allowable ground displacement.Consequently,the optimal anchor length,along with the corresponding internal forces and deformations of the structure,is obtained.Characterized by broad applicability,this method is applicable to various types of retaining structures,encompassing single and multilayered soil pile foundations,as well as different retaining structures such as anti-slide piles,cable bolt piles,chair piles,and cable-bolt chair piles.In comparison to conventional analytical methods,it offers a unified approach to tackle computational problems under diverse soil conditions and structural configurations,circumventing the challenge of obtaining analytical solutions.Moreover,the calculation procedure is straightforward and conducive to programmed application in practical engineering scenarios.

关 键 词：桩基支挡结构 锚固深度 最优值 二分法 容许变形量 

分 类 号：U417.11[交通运输工程—道路与铁道工程]