金山铁路既有线提速路基动力响应分析
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摘要
基于无限元人工边界和基床—路堤—场地子结构系统,建立上海金山铁路既有线有限元模型,根据实测路基响应特征构造基床顶面动荷载,模拟列车以现行速度通过路基产生的动荷载,分析列车在现行速度43km.h-1和目标速度160km.h-1范围内变化时,普通路基在动荷载作用下的动力响应规律。研究发现:如果既有线路基床不改造,列车速度从43km.h-1提高至160km.h-1时,基床顶面动应力峰值将增大17%左右;路基面动应力沿基面以下深度方向呈指数形态衰减;与现行速度条件下基床顶面以下6.2m的影响深度相比,提速后影响深度增加了1.2m。
Based on the infinite artificial boundary and the substructure system of the bed-embankment-field,a finite element model of the existing Jinshan railway subgrade in Shanghai was established.According to the measured response characteristics of subgrade,the function of moving load on the bedding surface was built to simulate the actual dynamic loads produced by trains with the current speed.The dynamic response of the ordinary subgrade was analyzed under the moving loads produced by trains from the current speed 43 km·h-1 to the target speed 160 km·h-1.It is found that,if the train speed is increased to 160 km·h-1 from 43 km·h-1 without reconstructing the existing subgrade,the peak value of the dynamic stress on the bedding surface will increase by about 17%.The vertical dynamic stress on the subgrade surface declines with the depth below in the form of exponential decay.Compared to 6.2 m below the bedding surface under the present speed,the influence depth has increased 1.2 m after speed increase.
Based on the infinite artificial boundary and the substructure system of the bed-embankment-field,a finite element model of the existing Jinshan railway subgrade in Shanghai was established.According to the measured response characteristics of subgrade,the function of moving load on the bedding surface was built to simulate the actual dynamic loads produced by trains with the current speed.The dynamic response of the ordinary subgrade was analyzed under the moving loads produced by trains from the current speed 43 km·h-1 to the target speed 160 km·h-1.It is found that,if the train speed is increased to 160 km·h-1 from 43 km·h-1 without reconstructing the existing subgrade,the peak value of the dynamic stress on the bedding surface will increase by about 17%.The vertical dynamic stress on the subgrade surface declines with the depth below in the form of exponential decay.Compared to 6.2 m below the bedding surface under the present speed,the influence depth has increased 1.2 m after speed increase.
引文
[1]马伟斌.既有线提速基床和道床相互影响的研究[D].北京:铁道科学研究院,2006.(MA Weibin.Research of Interaction between the Subgrade Bed and the Ballast Bed on Existing Speed-Raising Rail-ways[D].Beijing:China Academy of Railway Sciences,2006.in Chinese)
[2]韩自力,张千里.既有线提速路基动应力分析[J].中国铁道科学,2005,26(5):1-4.(HAN Zili,ZHANG Qianli.Dynamic Stress Analysis on Speed-Increase Subgrade of Exsiting Railway[J].ChinaRailway Science,2005,26(5):1-4.in Chinese)
[3]马伟斌,韩自力.提速列车通过时既有线非改建路基的适应性研究[J].铁道工程学报,2008,25(3):1-4.(MA Weibin,HAN Zili.Study on Adaptability of the Existing Subgrade to Train Speed-Increase[J].Journal ofRailway Engineering Soceity,2008,25(3):1-4.in Chinese)
[4]宗军良,刘涛,宫全美,等.既有线提速路基动力响应特性研究[J].中国铁道科学,2007,28(4):7-10.(ZONG Junliang,LIU Tao,GONG Quanmei,et al.Dynamic Response Study on Speed-Increase Subgrade of Ex-isting Railway[J].China Railway Science,2007,28(4):7-10.in Chinese)
[5]宫全美,王炳龙.沪宁线提速铁路路基的强度条件[J].同济大学学报:自然科学版,2006,34(2):1-4.(GONG Quanmei,WANG Binglong.Strength Requirements of Upgrading-Speed Railway Subgrade of Shanghai-Nanjing Line[J].Journal of Tongji University:Natural Science,2006,34(2):1-4.in Chinese)
[6]黄雨,叶为民.上海软土场地的地震反应特征分析[J].地下空间与工程学报,2005,1(5):773-778.(HUANG Yu,YE Weimin.Characteristic Analysis for Seismic Ground Response of Soft Soils in Shanghai[J].Chi-nese Journal of Underground Space and Engineering,2005,1(5):773-778.in Chinese)
[7]翟婉明.车辆-轨道耦合动力学[M].北京:科学出版社,2007:88-101.
[8]许杰,王峰.提速对既有线路桥过渡段路基动力响应影响分析[J].岩土工程学报,2010,32(增2):241-244.(XU Jie,WANG Feng.Impact of Speed Raising on Dynamic Response of Bridge-Subgrade Transition of ExistingRailway[J].Chinese Journal of Geotecchnical Engineering,2010,32(Supplement 2):241-244.in Chinese)
[2]韩自力,张千里.既有线提速路基动应力分析[J].中国铁道科学,2005,26(5):1-4.(HAN Zili,ZHANG Qianli.Dynamic Stress Analysis on Speed-Increase Subgrade of Exsiting Railway[J].ChinaRailway Science,2005,26(5):1-4.in Chinese)
[3]马伟斌,韩自力.提速列车通过时既有线非改建路基的适应性研究[J].铁道工程学报,2008,25(3):1-4.(MA Weibin,HAN Zili.Study on Adaptability of the Existing Subgrade to Train Speed-Increase[J].Journal ofRailway Engineering Soceity,2008,25(3):1-4.in Chinese)
[4]宗军良,刘涛,宫全美,等.既有线提速路基动力响应特性研究[J].中国铁道科学,2007,28(4):7-10.(ZONG Junliang,LIU Tao,GONG Quanmei,et al.Dynamic Response Study on Speed-Increase Subgrade of Ex-isting Railway[J].China Railway Science,2007,28(4):7-10.in Chinese)
[5]宫全美,王炳龙.沪宁线提速铁路路基的强度条件[J].同济大学学报:自然科学版,2006,34(2):1-4.(GONG Quanmei,WANG Binglong.Strength Requirements of Upgrading-Speed Railway Subgrade of Shanghai-Nanjing Line[J].Journal of Tongji University:Natural Science,2006,34(2):1-4.in Chinese)
[6]黄雨,叶为民.上海软土场地的地震反应特征分析[J].地下空间与工程学报,2005,1(5):773-778.(HUANG Yu,YE Weimin.Characteristic Analysis for Seismic Ground Response of Soft Soils in Shanghai[J].Chi-nese Journal of Underground Space and Engineering,2005,1(5):773-778.in Chinese)
[7]翟婉明.车辆-轨道耦合动力学[M].北京:科学出版社,2007:88-101.
[8]许杰,王峰.提速对既有线路桥过渡段路基动力响应影响分析[J].岩土工程学报,2010,32(增2):241-244.(XU Jie,WANG Feng.Impact of Speed Raising on Dynamic Response of Bridge-Subgrade Transition of ExistingRailway[J].Chinese Journal of Geotecchnical Engineering,2010,32(Supplement 2):241-244.in Chinese)
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