煤矿采空区基础变形特高压输电塔的承载力计算
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摘要
煤矿采空区铁塔基础易发生变形,严重威胁特高压输电线路的运行安全。采用通用有限元软件ANSYS建立1000kV特高压输电铁塔有限元模型,对采空区铁塔在基础发生沉降、倾斜或滑移后,与正常设计工况进行组合时杆件的内力及其变化趋势进行计算分析,确定了不同工况下的基础变形限值。结果表明,在外荷载相同的情况下,基础位移限值由大到小的顺序为:顺线路变形、横线路变形、不均匀沉降和基础滑移。60°大风工况下基础变形限值最小,为铁塔基础变形的控制工况。与现行规程相比,计算得到的基础不均匀沉降限值偏低,依照规程限值判断铁塔受力状况偏于危险。基础位移未超过限值时对铁塔进行扶正,除基础水平滑移情况以外,铁塔杆件内力未超过极限承载力,处于安全状态。研究结果为我国煤矿采空区基础变形特高压输电线路的安全运行提供参考依据。
The tower foundation above goaf of coal mine is easily deformed,which causes serious threat to the safe operation of UHV transmission lines.In this paper,the finite element model of 1 000 kV transmission tower was established,and the internal member forces as well as their variation trends were analyzed under foundation settelment,slip and inclination combined with normal design conditions.The limitations of foundation deformation under different conditions were determined.It shows that the limitations of longitudinal deformation,tranverse deformation,non-uniform settlement and horizontal slip are decreased in above turn when with the same external loads.The foundation deformation under condition of the wind with 60 degree is the lowest,which is the control condition of foundation deformation.The limitation of non-uniform settelment through computation is lower than the provision in the current regulation,and it is dangerous to evaluate the stress state according to the regulation.In the righting process of the tower,the internal member forces aren't over than the critical bearing capacities except the horizontal slip,and the tower is in a safe state.The research results provide very important reference and basis for the safe operation of UHV transmission lines in the goaf area of coal mine.
The tower foundation above goaf of coal mine is easily deformed,which causes serious threat to the safe operation of UHV transmission lines.In this paper,the finite element model of 1 000 kV transmission tower was established,and the internal member forces as well as their variation trends were analyzed under foundation settelment,slip and inclination combined with normal design conditions.The limitations of foundation deformation under different conditions were determined.It shows that the limitations of longitudinal deformation,tranverse deformation,non-uniform settlement and horizontal slip are decreased in above turn when with the same external loads.The foundation deformation under condition of the wind with 60 degree is the lowest,which is the control condition of foundation deformation.The limitation of non-uniform settelment through computation is lower than the provision in the current regulation,and it is dangerous to evaluate the stress state according to the regulation.In the righting process of the tower,the internal member forces aren't over than the critical bearing capacities except the horizontal slip,and the tower is in a safe state.The research results provide very important reference and basis for the safe operation of UHV transmission lines in the goaf area of coal mine.
引文
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[17]Lei Yinghui,Chien Yulin.Seismic analysis of transmission towers considering both geometric and material nonlinearities[J].Tamkang Journal of Science and Engineering,2005:8(1):29-42.
[18]李宏男,胡大柱,黄连壮.地震作用下输电塔体系塑性极限状态分析[J].中国电机工程学报,2006,26(24):192-199.Li Hongnan,Hu Dazhu,Huang Lianzhuang.Plastic limit analysis of the transmission tower system subjected to earthquake action[J].Proceedings of the CSEE,2006,26(24):192-199(in Chinese).
[19]田利,李宏男,黄连壮.多点激励下输电塔-线体系的侧向地震反应分析[J].中国电机工程学报,2008,28(16):108-114.Tian Li,LiHongnan,Huang Lianzhuang.Lateral response of transmission tower-line system under multiple support excitations[J].Proceedings of the CSEE,2008,28(16):108-114(in Chinese).
[20]胡大柱,李宏男.格构式输电铁塔组成杆件对极限承载力影响的研究[J].世界地震工程,2004,20(3):50-55.Hu Dazhu,Li Hongnan.Influence of components on ultimate strength in lattice transmission tower[J].World Information on Earthquake Engineering,2004,20(3):50-55(in Chinese).
[21]李宏男,任月明,白海峰.输电塔体系风雨激励的动力分析模型[J].中国电机工程学报,2007,27(30):43-48.Li Hongnan,Ren Yueming,Bai Haifeng.Rain-wind-induced dynamic model for transmission tower system[J].Proceedings of the CSEE,2007,27(30):43-48(in Chinese).
[22]柳国环,李宏男.高压输电塔-线体系风致动力响应分析与优化控制[J].中国电机工程学报,2008,28(19):131-137.Liu Guohuan,Li Hongnan.Analysis and optimization control of wind-induced dynamic response for high-voltage transmission tower-line system[J].Proceedings of the CSEE,2008,28(19):131-137.(in Chinese).
[2]郝梦明.220kV四端线012号铁塔基础纠偏技术分析[J].广东电力,2002,15(1):67-69.Hao Mengming.Analysis on foundation reflection for No.12tower in Siduan220kV transmission line[J].Guangdong Electric Power,2002,15(1):67-69(in Chinese).
[3]杜庆荣.铁塔倾斜原因及纠偏技术的探讨[J].武汉船舶职业技术学院学报,2006(3):46-48.Du Qingrong.Argument on the cause of iron tower incline and its prevention techniques[J].Wuhan Institute of Shipbuilding Technology,2006(3):46-48(in Chinese).
[4]张建强,杨昆,王予东,等.煤矿采空区地段高压输电线路铁塔地基处理的研究[J].电网技术,2006,30(2):30-34.Zhang Jianqiang,Yang Kun,Wang Yudong,et al.Research on foundation treatment of high voltage transmission towers erected above goaf of coal mine[J].Power System Technology,2006,30(2):30-34(in Chinese).
[5]付明翔,韩为民,默增禄.煤矿采空区500kV输电线路设计的探讨[J].电力建设,2004,25(6):30-32.Fu Mingxiang,Han Weimin,Mo Zenglu.Inquisition into design of500kV transmission lines routed in emptied area of coal mine[J].Electric Power Construction,2004,25(6):30-32(in Chinese).
[6]查剑锋,郭广礼,狄丽娟,等.高压输电线路下采煤防护措施探讨[J].矿山压力与顶板管理,2005(1):112-114.
[7]国网北京电力建设研究院.煤矿采空区架空输电线路基础研究报告[R].北京:国家电网公司,2006.
[8]刘毓氚,刘祖德.输电线路倾斜铁塔原位加固纠偏关键技术研究[J].岩土力学,2008,29(1):173-176.Liu Yuchuan,Liu Zude.Study on stabilization and rectification technology for inclined transmission tower[J].Rock and Soil Mechanics,2008,29(1):173-176(in Chinese).
[9]刘振亚.特高压电网[M].北京:中国经济出版社,2005:8-22.
[10]中华人民共和国发展与改革委员会.DL/T5219-2005架空送电线路基础设计技术规定[S].北京:中国电力出版社,2005.
[11]中华人民共和国国家经济贸易委员会.DL/T741-2001架空送电线运行规程[S].北京:中国电力出版社,2001.
[12]中华人民共和国国家经济贸易委员会.DL/T5154-2002架空送电线路杆塔结构设计技术规定[S].北京:中国电力出版社,2002.
[13]祝效华,余志祥,杨风利,等.ANSYS高级工程有限元范例精选[M].北京:电子工业出版社,2004:83-117.
[14]王新敏.ANSYS工程结构与数值仿真[M].北京:人民交通出版社,2007:430-495.
[15]李清华,杨靖波.特高压输电杆塔动力特性分析快速建模研究[J].电力建设,2006,27(5):5-7.Li Qinghua,Yang Jingbo.Study on rapid modeling of dynamiccharacteristic analysis for EHV transmission towers[J].Electric Power Construction,2006,27(5):5-7(in Chinese).
[16]夏开全,李茂华,李峰.特高压输电线路直线塔结构分析与试验[J].高电压技术,2007,33(11):56-60.Xia Kaiquan,Li Maohua,Li Feng.Structural analysis and testing research for Chinese1000kV UHV AC transmission tower[J].High Voltage Engineering,2007,33(11):56-60(in Chinese).
[17]Lei Yinghui,Chien Yulin.Seismic analysis of transmission towers considering both geometric and material nonlinearities[J].Tamkang Journal of Science and Engineering,2005:8(1):29-42.
[18]李宏男,胡大柱,黄连壮.地震作用下输电塔体系塑性极限状态分析[J].中国电机工程学报,2006,26(24):192-199.Li Hongnan,Hu Dazhu,Huang Lianzhuang.Plastic limit analysis of the transmission tower system subjected to earthquake action[J].Proceedings of the CSEE,2006,26(24):192-199(in Chinese).
[19]田利,李宏男,黄连壮.多点激励下输电塔-线体系的侧向地震反应分析[J].中国电机工程学报,2008,28(16):108-114.Tian Li,LiHongnan,Huang Lianzhuang.Lateral response of transmission tower-line system under multiple support excitations[J].Proceedings of the CSEE,2008,28(16):108-114(in Chinese).
[20]胡大柱,李宏男.格构式输电铁塔组成杆件对极限承载力影响的研究[J].世界地震工程,2004,20(3):50-55.Hu Dazhu,Li Hongnan.Influence of components on ultimate strength in lattice transmission tower[J].World Information on Earthquake Engineering,2004,20(3):50-55(in Chinese).
[21]李宏男,任月明,白海峰.输电塔体系风雨激励的动力分析模型[J].中国电机工程学报,2007,27(30):43-48.Li Hongnan,Ren Yueming,Bai Haifeng.Rain-wind-induced dynamic model for transmission tower system[J].Proceedings of the CSEE,2007,27(30):43-48(in Chinese).
[22]柳国环,李宏男.高压输电塔-线体系风致动力响应分析与优化控制[J].中国电机工程学报,2008,28(19):131-137.Liu Guohuan,Li Hongnan.Analysis and optimization control of wind-induced dynamic response for high-voltage transmission tower-line system[J].Proceedings of the CSEE,2008,28(19):131-137.(in Chinese).
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