3000万次列车荷载作用下Ⅲ型板式轨道力学性能演化试验
|
摘要
利用CRTSⅢ型板式轨道-路基结构足尺试验模型,模拟高速列车荷载作用,进行3 000万次疲劳试验,对扣件刚度、隔离层刚度及各部件加速度的演化规律进行分析。研究结果表明:扣件动静刚度均随荷载作用次数增幅分别为116%和30%,动静刚度比呈线性增加,疲劳荷载作用到1000万次左右时,动静刚度比达到1.5;根据试验结果拟合得到隔离层刚度与荷载作用次数呈二次函数关系,相关系数为0.975,据此可以预测3 600万次时刚度达到最大值,约为初始刚度2.4倍;钢轨及轨道板加速度降幅分别为63%和34%,底座加速度增幅为54%;研究成果可为CRTSⅢ型板式轨道状态评估研究及养维策略制定提供参考。
Based on the full-scale test model of CRTSⅢ slab track-subgrade structure system, the evolution of mechanical properties for fastener stiffness, isolated layer stiffness and acceleration on each parts of track structure were studied under 30 million high-speed train fatigue load tests. The results show that: The dynamic and static stiffness of fastening increased by 116% and 30%, respectively, and the ratio of dynamic stiffness and static stiffness increased linearly with the increasing of train load times. After 10 million fatigue load tests, the ratio of dynamic stiffness and static stiffness was larger than 1.5. Based on the test results, the stiffness of isolated layer changes in accordance with quadratic function, and the correlation coefficient is 0.975. It was estimated that the maximum stiffness is 2.4 times of the initial after 36 million fatigue load tests. The acceleration of rail and slab track reduced by 63% and 34% respectively while the acceleration of support increased by 54%. The research is useful to guide the mechanical properties study and maintenance of CRTSⅢ slab track structure.
Based on the full-scale test model of CRTSⅢ slab track-subgrade structure system, the evolution of mechanical properties for fastener stiffness, isolated layer stiffness and acceleration on each parts of track structure were studied under 30 million high-speed train fatigue load tests. The results show that: The dynamic and static stiffness of fastening increased by 116% and 30%, respectively, and the ratio of dynamic stiffness and static stiffness increased linearly with the increasing of train load times. After 10 million fatigue load tests, the ratio of dynamic stiffness and static stiffness was larger than 1.5. Based on the test results, the stiffness of isolated layer changes in accordance with quadratic function, and the correlation coefficient is 0.975. It was estimated that the maximum stiffness is 2.4 times of the initial after 36 million fatigue load tests. The acceleration of rail and slab track reduced by 63% and 34% respectively while the acceleration of support increased by 54%. The research is useful to guide the mechanical properties study and maintenance of CRTSⅢ slab track structure.
引文
[1]刘学毅,赵坪锐,杨荣山,等.客运专线无砟轨道设计理论与方法[M].成都:西南交通大学出版社,2010:25-47.LIU Xueyi,ZHAO Pingrui,YANG Rongshan,et al.Design theory and method of passenger dedicated line ballastless track[M].Chengdu:Southwest Jiaotong University Press,2010:25-47.
[2]Mirza O,Kaewunruen S,Kwok K.Design and modelling of pre-cast steel-concrete composites for resilient railway track slabs[J].Steel and Composite Structures,2016,22(3):537-565.
[3]CHEN B,Oderji S Y,Chandan S.Feasibility of Magnesium Phosphate Cement(MPC)as a repair material for ballastless track slab[J].Construction and Building Materials,2017,154(11):270-274.
[4]YANG E H,WANG K C P,LUO Q.Asphalt concrete layer to support track slab of high-speed railway[J].Transportation Research Record,2015,25(5):6-14.
[5]王宇航,王继军.CRTSⅢ型板式无砟轨道的多尺度有限元模型[J].铁道科学与工程学报,2015,12(3):468-474.WANG Yuhang,WANG Jijun.Multi-scale finite element model for CRTS III type slab ballastless track structures[J].Journal of Railway Science and Engineering,2015,12(3):468-474.
[6]孙璐,段雨芬.高速铁路CRTSⅢ型板式无砟轨道结构受力特性研究[J].铁道工程学报,2013,30(11):33-39.SUN Lu,DUAN Yufen.Static response analysis of CRTSⅢballastless track structure[J].Journal of Railway Engineering Society,2013,30(11):33-39.
[7]任勃.减振型CRTSⅢ板式无砟轨道试验研究[D].成都:西南交通大学,2016.REN Bo.Experimental research on vibration characterristics of vibration CRTSⅢslab ballastless track[D].Chengdu:Southwest Jiaotong University,2016.
[8]何燕平.CRTSⅢ型板式无砟轨道疲劳特性研究[D].成都:西南交通大学,2011.HE Yanping.Study on fatigue property of the CRTSⅢslab track[D].Chengdu:Southwest Jiaotong University,2011.
[9]刘学毅,刘丹,赵坪锐,等.CRTSⅢ型板式无砟轨道疲劳性能试验研究[J].铁道工程学报,2016,33(11):51-56.LIU Xueyi,LIU Dan,ZHAO Pingrui,et al.Experimental research on the fatigue behavior test of CRTSⅢslab track[J].Journal of Railway Engineering Society,2016,33(11):51-56.
[10]吴斌,朱坤腾,曾志平,等.列车荷载作用下CRTSⅢ型板式无砟轨道力学特性试验研究[J].铁道科学与工程学报,2016,13(7):1229-1233.WU Bin,ZHU Kunteng,ZENG Zhiping,et al.Experimental study on the mechanical characteristics of CRTSⅢslab ballastless track under train load[J].Journal of Railway Science and Engineering,2016,13(7):1229-1233.
[11]中国铁道科学研究院,中南大学.服役状态下CRTSⅢ型板式无砟轨道结构体系经时性能试验研究[R].北京:中国铁道科学研究院,2015.China Academy of Railway Sciences,Central South University.Experimental study on performance of CRTSⅢslab track structure in service[R].Beijing:China Academy of Railway Sciences,2015.
[12]XIAO X B,JIN X S,WEN Z F.Effect of disabled fastening systems and ballast on vehicle derailment[J].Journal of Vibration and Acoustics,2007,129(2):217-229.
[13]张攀,周昌盛,王平.轨下垫板刚度的时变特性及其影响研究[J].铁道标准设计,2015,59(9):49-52.ZHANG Pan,ZHOU Changsheng,WANG Ping.Study on time variant characteristics and effects of rail pad Stiffness[J].Railway Standard Design,2015,59(9):49-52.
[14]科技基[2007]207号.WJ-8型扣件暂行技术条件[S].Science and technology[2007]No.207.Temporary technical conditions for WJ-8 type fasteners[S].
[15]Kaewunruen S,Kimani S K.Damped frequencies of precast modular steel-concrete composite railway track slabs[J].Steel and Composite Structures,2017,25(4):427-442.
[2]Mirza O,Kaewunruen S,Kwok K.Design and modelling of pre-cast steel-concrete composites for resilient railway track slabs[J].Steel and Composite Structures,2016,22(3):537-565.
[3]CHEN B,Oderji S Y,Chandan S.Feasibility of Magnesium Phosphate Cement(MPC)as a repair material for ballastless track slab[J].Construction and Building Materials,2017,154(11):270-274.
[4]YANG E H,WANG K C P,LUO Q.Asphalt concrete layer to support track slab of high-speed railway[J].Transportation Research Record,2015,25(5):6-14.
[5]王宇航,王继军.CRTSⅢ型板式无砟轨道的多尺度有限元模型[J].铁道科学与工程学报,2015,12(3):468-474.WANG Yuhang,WANG Jijun.Multi-scale finite element model for CRTS III type slab ballastless track structures[J].Journal of Railway Science and Engineering,2015,12(3):468-474.
[6]孙璐,段雨芬.高速铁路CRTSⅢ型板式无砟轨道结构受力特性研究[J].铁道工程学报,2013,30(11):33-39.SUN Lu,DUAN Yufen.Static response analysis of CRTSⅢballastless track structure[J].Journal of Railway Engineering Society,2013,30(11):33-39.
[7]任勃.减振型CRTSⅢ板式无砟轨道试验研究[D].成都:西南交通大学,2016.REN Bo.Experimental research on vibration characterristics of vibration CRTSⅢslab ballastless track[D].Chengdu:Southwest Jiaotong University,2016.
[8]何燕平.CRTSⅢ型板式无砟轨道疲劳特性研究[D].成都:西南交通大学,2011.HE Yanping.Study on fatigue property of the CRTSⅢslab track[D].Chengdu:Southwest Jiaotong University,2011.
[9]刘学毅,刘丹,赵坪锐,等.CRTSⅢ型板式无砟轨道疲劳性能试验研究[J].铁道工程学报,2016,33(11):51-56.LIU Xueyi,LIU Dan,ZHAO Pingrui,et al.Experimental research on the fatigue behavior test of CRTSⅢslab track[J].Journal of Railway Engineering Society,2016,33(11):51-56.
[10]吴斌,朱坤腾,曾志平,等.列车荷载作用下CRTSⅢ型板式无砟轨道力学特性试验研究[J].铁道科学与工程学报,2016,13(7):1229-1233.WU Bin,ZHU Kunteng,ZENG Zhiping,et al.Experimental study on the mechanical characteristics of CRTSⅢslab ballastless track under train load[J].Journal of Railway Science and Engineering,2016,13(7):1229-1233.
[11]中国铁道科学研究院,中南大学.服役状态下CRTSⅢ型板式无砟轨道结构体系经时性能试验研究[R].北京:中国铁道科学研究院,2015.China Academy of Railway Sciences,Central South University.Experimental study on performance of CRTSⅢslab track structure in service[R].Beijing:China Academy of Railway Sciences,2015.
[12]XIAO X B,JIN X S,WEN Z F.Effect of disabled fastening systems and ballast on vehicle derailment[J].Journal of Vibration and Acoustics,2007,129(2):217-229.
[13]张攀,周昌盛,王平.轨下垫板刚度的时变特性及其影响研究[J].铁道标准设计,2015,59(9):49-52.ZHANG Pan,ZHOU Changsheng,WANG Ping.Study on time variant characteristics and effects of rail pad Stiffness[J].Railway Standard Design,2015,59(9):49-52.
[14]科技基[2007]207号.WJ-8型扣件暂行技术条件[S].Science and technology[2007]No.207.Temporary technical conditions for WJ-8 type fasteners[S].
[15]Kaewunruen S,Kimani S K.Damped frequencies of precast modular steel-concrete composite railway track slabs[J].Steel and Composite Structures,2017,25(4):427-442.