斜锚短桩基础受力特性与控制因素研究  

Study on Stress Characteristics and Control Factors of Inclined Anchor Short Column

作　　者：田雷 谢强[2,3] 张逸青 秦培原 向城名 Tian Lei;Xie Qiang;Zhang Yiqing;Qin Peiyuan;Xiang Chengming(State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,P.R.China;School of Civil Engineering,Chongqing University,Chongqing 400045,P.R.China;National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas(Chongqing),Chongqing 400045,P.R.China;State Grid Chongqing Economic Research Institute,Chongqing 401121,P.R.China;State Nuclear Power Planning and Design Institute Chongqing Co.,Ltd,Chongqing 401121,P.R.China)

机构地区：[1]国网经济技术研究院有限公司,北京102209 [2]重庆大学土木工程学院,重庆400045 [3]库区环境地质灾害防治国家地方联合工程研究中心(重庆),重庆400045 [4]国网重庆市电力公司经济技术研究院,重庆401121 [5]国核电力规划设计研究院重庆有限公司,重庆401121

出　　处：《地下空间与工程学报》2024年第1期181-189,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家电网公司总部科技项目(5200-202256088A-1-1-ZN)。

摘　　要：我国西南山区地形陡峭,存在着大量覆盖层薄、下覆基岩工程性状较好但开挖难度大的复合地层,不利于输电铁塔基础建设。针对该问题,采用斜锚短柱基础作为输电铁塔基础,该基础可以在减小开挖深度、降低施工难度的同时充分利用基岩的承载性能。为了探究斜锚短桩基础受力特性与主要控制因素,运用FLAC3D建立数值模型,探讨了锚杆锚筋直径和锚杆角度对斜锚短桩基础的抗拔承载特性影响。结果表明:在荷载较大时,随着锚筋直径增大,锚杆结构承载比例有明显上升,但若锚筋直径过大,锚杆的承载比例随锚筋直径增加而提升空间较小;锚杆角度减小,斜锚短桩基础在纯上拔荷载作用下的抗拔承载能力提高,但其对水平荷载的抵抗能力会减弱;综合考虑,在粉砂岩地层中,锚筋直径40 mm,锚杆角度25°为斜锚短桩基础最优设计参数。In southwest mountainous area of China,there are a large number of composite strata with thin covering layer,good engineering properties of overlying bedrock but difficult excavation,and the mountainous terrain is steep and complicated,which is not conducive to transmission tower infrastructure construction.To solve this problem,a short-pile foundation with inclined anchor is taken as transmission tower foundation,whose can make full use of the bearing capacity of the bedrock while reducing the excavation depth and construction difficulty.In order to explore the mechanical characteristics and main control factors of short pile foundation with inclined anchor,a numerical model was established by FLAC 3D,and the effects of anchor bar diameter and bolt angle on the tensile bearing characteristics of short pile foundation with inclined anchor were discussed.The results show that when the load is large,the bearing ratio of the anchor rod structure increases obviously with the increase of the diameter of the anchor bar,but if the diameter of the anchor bar is too large,the bearing ratio of the anchor rod has less room for lifting.As the bolt Angle decreases,the uplift bearing capacity of short pile foundation with inclined anchor increases under pure uplift load,but its resistance to horizontal load weakens.Considering comprehensively,In the siltstone stratum,anchor bar diameter 40mm and bolt Angle 25°are the optimal design parameters of short pile foundation with inclined anchor.

关 键 词：斜锚短桩基础 FLAC3D 抗拔承载特性 承载比例 

分 类 号：TU476[建筑科学—结构工程]