共查询到19条相似文献,搜索用时 78 毫秒
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秦沈客运专线路基技术特点 总被引:3,自引:0,他引:3
针对客运专线,高速铁路对路基的技术要求,简要阐述客运专线及高速铁路路基技术的主要特点,并对今后高速铁路路基的修建,提出应进一步开展研究的课题。 相似文献
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采用有限元软件对高速铁路路基在列车作用的动应力、振动加速度、速度、沉降、动应力衰减等应力应变规律进行理论性分析,结果表明:路基刚度的变化对路基顶面动应力的影响较小;路基综合刚度越高,路基的动力稳定性越高;采用振动加速度、速度及沉降三项指标作为高速铁路设计的控制参数较为合理. 相似文献
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高速铁路路基施工技术 总被引:1,自引:0,他引:1
根据我局收集到的中国铁路工程总公司《京沪高速铁路线桥施工技术的探讨》等资料,结合我局曾施工过的广深准高速铁路、高速公路、市政大面积软基处理工程实例,试述高速铁路基施工技术。 相似文献
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为预测高速铁路路基在列车荷栽下的变形,以用虚功原理建立的路基体系运动方程为理论基础,采用粘弹性人工边界,土体本构采用Drucker—Prager模型,用ANSYS建立一双线路基有限元模型。利用ANSYS的函数加载器导入列车荷载,计算出列车以时速200km单向行驶和双向行驶两种工况时弹性、塑性状态下路基土内的变形和应力情况,并得到其时程分析结果。弹性状态下的计算结果和实测值相比吻合较好,但塑性状态下的计算结果与实测值相比尚有差距。所建模型及分析结果可为高速铁路路基设计及变形控制提供参考。 相似文献
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通过有限元软件对路基振动碾压进行仿真计算,主要分析了振动碾压在路基中的能量分布。以应变能衰减至10%为控制标准,得出振动碾压在深度方向的影响范围在0.45 m之内,为高速铁路及高速客运专线设计施工提供参考。 相似文献
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高速铁路路基过渡段包括正梯形和倒梯形两种过渡形式。为评价不同过渡段形式对车辆-轨道-路基过渡耦合系统动力特性的影响,基于车辆-轨道-路基耦合力学原理,运用MATLAB计算程序建立了列车-轨道-路基过渡段垂向耦合动力模型。计算结果表明:正梯形路基过渡段形式的刚度变化在纵向和深度方向比倒梯形过渡段形式更平缓,更有利于高速列车行驶的安全和平顺;过渡段3 m范围内系统动力响应变化较为剧烈,在过渡段尺寸及形状均匀段两种过渡段形式下系统动力响应无差异,在过渡段尺寸及形状变化范围内,系统动力响应表现出一定差异,且正梯形过渡段形式下动力响应波动较小。 相似文献
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高速铁路路基变形控制值的研究 总被引:5,自引:0,他引:5
本文在参考国内外资料的基础上,分析了高速铁路路基变形控制值的确定原则和方法。通过车辆/轨道/路基竖向动力分析和有限元计算,针对我国高速铁路路基设计原则,提出了基床的累积下沉、基床的弹性变形和路基填土的压密下沉的控制值的建议值。 相似文献
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Elias Kassa Clas Andersson Jens C. O. Nielsen 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2006,44(3):247-258
Dynamic train-track interaction is more complex in railway turnouts (switches and crossings) than that in ordinary tangent or curved tracks. Multiple contacts between wheel and rail are common, and severe impact loads with broad frequency contents are induced, when nominal wheel-rail contact conditions are disturbed because of the continuous variation in rail profiles and the discontinuities in the crossing panel. The absence of transition curves at the entry and exit of the turnout, and the cant deficiency, leads to large wheel-rail contact forces and passenger discomfort when the train is switching into the turnout track. Two alternative multibody system (MBS) models of dynamic interaction between train and a standard turnout design are developed. The first model is derived using a commercial MBS software. The second model is based on a multibody dynamics formulation, which may account for the structural flexibility of train and track components (based on finite element models and coordinate reduction methods). The variation in rail profile is accounted for by sampling the cross-section of each rail at several positions along the turnout. Contact between the back of the wheel flange and the check rail, when the wheelset is steered through the crossing, is considered. Good agreement in results from the two models is observed when the track model is taken as rigid. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):247-258
Dynamic train–track interaction is more complex in railway turnouts (switches and crossings) than that in ordinary tangent or curved tracks. Multiple contacts between wheel and rail are common, and severe impact loads with broad frequency contents are induced, when nominal wheel–rail contact conditions are disturbed because of the continuous variation in rail profiles and the discontinuities in the crossing panel. The absence of transition curves at the entry and exit of the turnout, and the cant deficiency, leads to large wheel–rail contact forces and passenger discomfort when the train is switching into the turnout track. Two alternative multibody system (MBS) models of dynamic interaction between train and a standard turnout design are developed. The first model is derived using a commercial MBS software. The second model is based on a multibody dynamics formulation, which may account for the structural flexibility of train and track components (based on finite element models and coordinate reduction methods). The variation in rail profile is accounted for by sampling the cross-section of each rail at several positions along the turnout. Contact between the back of the wheel flange and the check rail, when the wheelset is steered through the crossing, is considered. Good agreement in results from the two models is observed when the track model is taken as rigid. 相似文献
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应用温度应力场和湿度应力场的相似性原理,采用有限元软件进行模拟分析湿软路基遇水作用时的湿度应力问题.针对湿软路基不同情况进行数值模拟分析,对比模拟计算结果,得出土路基遇水作用后的变形和应力分布规律,供湿软路基设计施工参考. 相似文献
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通过对兰渝铁路南充段嘉陵江两岸路基的静力触探测试成果进行统计分析,得到了软土、粘性土和砂类土的静力触探参数值,可快速确定和划分土类.提出利用端阻qc和基本承载力σ0判别松软土的方法,对现行规范利用双桥静力触探参数进行土类划分作了有益的补充.而各类土的基本承载力σ0.和压缩模量Es与端阻qc之间关系式的建立,为相关专业设计提供较可靠的力学参数. 相似文献
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