无砟轨道基床吸水膨胀上拱对高速列车的影响分析
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摘要
无砟轨道路基基床填料吸水膨胀上拱对高速列车安全性能会产生不利影响。基于温度场与湿度场膨胀相似性,采用土体热传导膨胀过程模拟土体吸水膨胀过程,实现了用温度场-应力场模拟无砟轨道基床局部吸水膨胀上拱。通过试验与数值计算结果拟合确定了温度场与湿度场关联参数,提出了高速列车-膨胀路基耦合计算方法。工程应用表明:该方法能够得到基床上拱产生的列车轮对加速度增量,方便评估无砟轨道基床局部膨胀上拱对高速列车的影响。考虑吸水膨胀上拱产生的加速度增量,采用综合影响因素等级评分(B值)方法,将无砟轨道基床层局部吸水膨胀上拱病害划分为3个等级。
The ballastless track subgrade bed filler will expand and heave after absorbing water,which will have a negative impact on the safety performance of high speed train.Based on the similarity between temperature field and humidity field expansion,the thermal conduction expansion process of soil was used to simulate the process of soil water absorption and expansion,and the temperature/stress field was used to simulate the expansion and heaving oflocal ballastless track subgrade bed caused by water absorption. The correlative parameters of temperature field and humidity field were determined by fitting the experimental and numerical results,and a coupled calculation method of high speed train-expansion subgrade bed was proposed. The engineering application shows that this method can obtain the acceleration increment of train wheelset generated by the heaving of subgrade bed,and it is convenient to evaluate the effect of expansion and heaving oflocal ballastless track subgrade bed on high speed train. C onsidering the acceleration increment due to expansion and heaving caused by water absorption,the expansion and heaving disease oflocal ballastless track subgrade bed caused by water absorption is divided into three grades by using the comprehensive influencing factor grade score( B value) method.
The ballastless track subgrade bed filler will expand and heave after absorbing water,which will have a negative impact on the safety performance of high speed train.Based on the similarity between temperature field and humidity field expansion,the thermal conduction expansion process of soil was used to simulate the process of soil water absorption and expansion,and the temperature/stress field was used to simulate the expansion and heaving oflocal ballastless track subgrade bed caused by water absorption. The correlative parameters of temperature field and humidity field were determined by fitting the experimental and numerical results,and a coupled calculation method of high speed train-expansion subgrade bed was proposed. The engineering application shows that this method can obtain the acceleration increment of train wheelset generated by the heaving of subgrade bed,and it is convenient to evaluate the effect of expansion and heaving oflocal ballastless track subgrade bed on high speed train. C onsidering the acceleration increment due to expansion and heaving caused by water absorption,the expansion and heaving disease oflocal ballastless track subgrade bed caused by water absorption is divided into three grades by using the comprehensive influencing factor grade score( B value) method.
引文
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[3]尹鑫,王迎超,高杰,等.基于直觉模糊集的膨胀土胀缩性评价[J].土木工程学报,2018,51(5):103-111.
[4]卢再华,陈正汉,方祥位,等.非饱和膨胀土的结构损伤模型及其在土坡多场耦合分析中的应用[J].应用数学和力学,2006,27(7):781-788.
[5]缪协兴,杨成永,陈至达.膨胀岩体中的湿度应力场理论[J].岩土力学,1993,14(4):49-55.
[6]周坤.膨胀土隧道衬砌膨胀力数值模拟研究[D].成都:西南交通大学,2007.
[7]丁金华,陈仁朋,童军,等.基于多场耦合数值分析的膨胀土边坡浅层膨胀变形破坏机制研究[J].岩土力学,2015,36(增1):159-168.
[8]曾仲毅,徐帮树,胡世权,等增湿条件下膨胀土隧道衬砌破坏数值分析[J].岩土力学,2014,35(3):871-880.
[9]国家铁路局.高速铁路设计规范:TB 10621—2014[S].北京:中国铁道出版社,2014.
[10]王启云.高速铁路无砟轨道路基动力特性及参数研究[D].长沙:中南大学,2013.
[11]金亮星,乔世范.车辆-轨道-路基系统垂向动力分析模型的试验验证[J].振动与冲击,2008(3):38-41,178.
[12]王启云,张家生,孟飞,等.高速铁路轨道路基模型及动力加载研究[J].铁道学报,2012,34(12):90-95.
[13]谢旭.黔桂线定水坝隧道内无砟轨道病害成因及整治研究[D].成都:西南交通大学,2015.
[14]DUONG T V,CUI Y J,TANG A M,et al. Investigating the Mud Pumping and Interlayer Creation Phenomena in Railway Sub-structure[J].Engineering Geology,2014,171:45-58.
[15]杜彦良,侯哲哲,赵维刚.一种基于稀疏表示的重载铁路路基病害快速识别方法[J].土木工程学报,2013(11):138-144.
[16]ALOBAIDI I,HOARE D J.The Role of Geotextile Reinforcement in the Control of Pumping at the Subgrade-subbase Interface of Highway Pavements[J].Geosynthetics International,1998,5(6):619-636.
[17]SELIG E T,WATERS J M.Track Geotechnology and Substructure Management[M].London:Thomas Telford Publications,1994.