微型钢管桩-锚杆新型组合基础承载特性研究  

Analysis of load-bearing characteristics of new composite foundation with micro steel pipe pile and anchor

作　　者：王新平 王瑞成 聂少锋[2] 蒙春玲 张清政 WANG Xinping;WANG Ruicheng;NIE Shaofeng;MENG Chunling;ZHANG Qingzheng(China Energy Engineering Group Shanxi Electric Power Engineering Co.,Ltd.,Taiyuan 030001,Shanxi,China;School of Civil Engineering,Chang'an University,Xi'an 710061,Shaanxi,China;School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]中国能源建设集团山西省电力勘测设计院有限公司,山西太原030001 [2]长安大学建筑工程学院,陕西西安710061 [3]长安大学公路学院,陕西西安710064

出　　处：《建筑科学与工程学报》2024年第6期152-161,共10页Journal of Architecture and Civil Engineering

基　　金：中国能源建设集团山西省电力勘测设计院有限公司科技项目(14-K2022-26-T03)。

摘　　要：为解决输电线路传统锚杆基础材料耗量大、施工安全问题突出、环水保效益差、施工工期长以及运输不便的问题,提出了一种装配式输电线路型钢群锚基础,包括型钢结构、微型钢管桩-锚杆新型组合基础。采用有限元方法建立了单根微型钢管桩-锚杆组合基础的三维精细化数值模型,研究了多种荷载工况下组合基础锚筋、灌浆体、钢管及周围岩体的应力场与位移场变化规律,并与普通锚杆基础计算结果进行了对比分析;分析了钢管尺寸、岩体强度等因素对新型组合基础承载性能的影响规律。讨论了新型组合基础水平位移与岩体强度的定量关系;将钢管、钢管内侧混凝土与锚筋简化为整体力学模型,基于Winkler弹性地基梁法建立了单根微型钢管桩-锚杆组合基础的水平位移计算方法,并将计算结果与数值模拟结果进行对比。结果表明:相同工况下新型组合基础锚筋、灌浆体与周围岩体的应力及位移更小,新型组合基础适用于岩体等级为极软岩的情况;多种荷载工况下新型组合基础产生的位移随着岩体强度降低而逐渐增大,当岩体质量较差时,可采用增大钢管的横截面面积及长度等措施限制组合基础的水平位移。In order to solve the problems of large material consumption,prominent construction safety problems,poor environmental and water protection benefits,long construction period and inconvenient transportation of traditional anchor foundation of transmission lines,a prefabricated transmission line steel group anchor foundation was proposed,including steel structure and new composite foundation with micro steel pipe pile and anchor.The three-dimensional refined numerical model of a single micro steel pipe pile and anchor combination foundation was established using finite element method,the changes in stress and displacement fields of composite foundation anchor bar,grout,steel pipe and surrounding rock under various load conditions were studied.The calculation results were compared with those of common anchor foundation.The influence of factors such as steel pipe size and rock strength on the bearing performance of the new composite foundation were analyzed.The quantitative relationship between the horizontal displacement of the new composite foundation and the strength of the rock mass was discussed.The steel pipe,concrete inside the steel pipe,and anchor bars were simplified into a holistic mechanical model.Based on the Winkler elastic foundation beam method,a horizontal displacement calculation method for single micro steel pipe pile and anchor combination foundation was established,and the calculation results were compared with numerical simulation results.The results show that under the same working conditions,the stress and displacement of the new composite foundation anchor bars,grout,and surrounding rock are smaller.The new composite foundation is suitable for situations where the rock mass grade is extremely soft.The displacement generated by the new composite foundation under various load conditions gradually increases as the rock strength decreases.When the quality of the rock mass is poor,measures such as increasing the cross-sectional area and length of the steel pipe can be taken to limit the horizontal

关 键 词：输电线路基础 微型钢管桩 锚杆基础 岩体 复杂荷载 

分 类 号：TU473[建筑科学—结构工程]