高压线塔井字梁基础悬空时的受力特征研究  

RESEARCH ON THE STRESS CHARACTERISTICS OF RIBBED BEAM FOUNDATION OF ELECTRICITY TRANSMISSION TOWER IN THE AIR

作　　者：夏军武[1,2] 袁方 夏翔[3] XIA Junwu YUAN Fang XIA Xiang(China University of Mining ＆ Technology, Xuzhou 221116, China Jiangsu Collaborative Innovation Center for Building Energy Saving and Construct Technology,Xuzhou 221116, China Zhejiang Electric Power Transmission ＆ Transformation Corporation,Hangzhou 310016,China)

机构地区：[1]中国矿业大学,江苏徐州221116 [2]江苏建筑节能与建造技术协同创新中心,江苏徐州221116 [3]浙江省送变电工程公司,杭州310016

出　　处：《工业建筑》2017年第10期110-114,123,共6页Industrial Construction

基　　金：国家自然科学基金项目(51274192);江苏省产学研前瞻性联合研究项目资助(SJXTY1609)

摘　　要：从煤矿采空区高压线塔基础的破坏机理分析出发,运用采动沉陷学、地基基础工程和结构力学等理论,推导出在不同塌陷情况及不同大风和覆冰条件下,地基塌陷下的高压线塔井字梁基础悬空时的容许悬空长度(塌陷面积比)的计算式。研究表明:当地基塌陷使井字梁基础一边悬空时,最不利工况为90°大风,井字梁基础容许悬空的面积最大;当地基塌陷使井字梁基础一角悬空时,最不利工况也为90°大风,井字梁基础容许悬空的面积最大。依据理论计算部分所得出的最大容许悬空面积比,使用ANSYS有限元软件模拟了地基塌陷使井字梁基础一边悬空和一角悬空两种塌陷情况下,地基不同悬空比例对井字梁基础所产生的应力及竖向地基反力。According to the failure mechanism analysis of the damage of the foundation of electricity transmission tower in mining subsidence area,the formula of the permitted suspended length（ the subsidence area ratio） of ribbed beam foundation of electricity transmission tower in the air by ground subsidence was derived from the theories of mining subsidence,foundation engineering and structural mechanics under different collapse conditions and different wind directions or ice coating. The study also indicated that when ribbed beam foundation was free from one side by ground subsidence,the most unfavorable condition was 90°strong wind,when the condition was 90°strong wind,the permitted suspended area of ribbed beam foundation was the largest; when ribbed beam foundation was free from one corner by ground subsidence,the most unfavorable condition was also 90° strong wind,when the condition was 90°strong wind,the permitted suspended area of ribbed beam foundation was the largest. According to the largest permitted suspended area ratio obained from theoretical calculation,the stress and vertical subgrade reaction of ribbed beam foundation caused by different suspension ratios of ribbed beam foundation free from one side and one corner by ground subsidence were simulated by ANSYS. As a result,the study could provide a reference for the design method of ribbed beam foundation in mining subsidence area in the future.

关 键 词：地基塌陷 井字梁基础悬空 悬空长度 应力 竖向地基反力 

分 类 号：TU476[建筑科学—结构工程]