输电杆塔根键式基础抗拔承载特性  

Uplift bearing characteristics of root foundation of transmission pole tower

作　　者：马泽慧 王俊杰 黄雪峰 陈思良 袁俊 MA Zehui;WANG Junjie;HUANG Xuefeng;CHEN Siliang;YUAN Jun(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Northwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Xi’an 710075,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆交通大学材料科学与工程学院,重庆400074 [3]重庆交通大学河海学院,重庆400074 [4]中国电力工程顾问集团西北电力设计院有限公司,西安710075

出　　处：《中国科技论文》2023年第4期393-399,共7页China Sciencepaper

基　　金：国网青海省电力公司科技项目(52283820000A)。

摘　　要：为了解决现有输电线路掏挖类基础抗拔承载力不足的问题,采用“基础+掏挖根键”的组合方式(掏挖类根键式基础),开展了单层根键式基础和双层根键式基础的现场试验,获得了根键式基础的荷载-位移曲线,定量揭示了不同根键布置型式与基础抗拔承载力的关系。通过数值模拟对不同根键数量、顶进长度、层数及层间距的掏挖类根键式基础进行了对比分析。结果表明:掏挖类根键式基础的抗拔承载力达到800 kN,明显高于传统基础;增加根键数量、顶进长度能有效提高基础的抗拔承载力,而不同根键层数及层间距对抗拔承载力的影响相对较小。In order to solve the problem of insufficient uplift bearing capacity of the existing excavated foundation of transmission lines,the combination mode of “foundation and excavated root”(called excavated root foundation in this paper) was adopted.Field tests of single-layer and double-layer root foundations were carried out to obtain load-displacement curves of root foundations,and quantitatively reveal the relationship between different root arrangements and the uplift bearing capacity of foundations.Numerical simulation was used to compare and analyze the root foundations with different numbers,jacking length,layer number and layer spacing of roots.The results show that the uplift bearing capacity of the excavated root foundation is 800 kN,which is obviously higher than that of the traditional foundation.Increasing the number of roots and the jacking length of roots can effectively improve the uplift bearing capacity of foundation,while the different layer number of roots and the layer spacing of roots have relatively little influence on the uplift bearing capacity.

关 键 词：输电塔架掏挖类基础 根键式基础 现场试验 数值模拟 抗拔承载力 

分 类 号：TU473.1[建筑科学—结构工程]