重载铁路隧道基底结构动力响应特性研究
发布时间：2018-10-16 19:30
【摘要】：摘要：我国自20世纪80年代开始发展重载铁路以来,相继建成大秦线、朔黄线、山西中南部通道等重载运输线路。然而,随着轴重增加,越来越多隧道基底出现开裂、破损、下陷及翻浆冒泥等病害,这些病害直接影响到货运安全性与经济性。本文依托国家自然科学基金煤炭联合基金项目(U1361204)—《30t以上轴重条件下铁路基础设施动力特征及适应性》和国家自然科学基金资助项目(51278494)—《重载铁路隧道底部结构服役性能演化机制与设计方法》,采用数值计算方法,系统分析了重载铁路隧底结构动力响应特性。主要研究成果如下： (1)基于已有重载列车及轨道参数,建立车辆—轨道耦合动力模型,获得了重载列车作用在隧底结构上的荷载时程曲线。 (2)基于已有重载铁路隧道设计参数,建立重载铁路隧道三维动力分析模型,分析了单、双线重载铁路隧道基底结构各部位动力响应特性,得到了轴重对隧底结构动力响应的影响规律。 (3)从隧底结构位移、加速度、应力三方面的增量分析了仰拱矢跨比、填充层厚度、仰拱厚度、铺底厚度对单双线重载铁路隧底结构动力响应的影响,得出了基底各设计参数对其动力响应的影响规律。 (4)从隧底结构位移、加速度、应力三方面的增量分析了基岩软化、脱空对双线隧道隧底结构动力响应的影响,得到了基岩各因素对隧底结构动力响应的影响规律。图78幅,表40个,参考文献94
[Abstract]:Abstract: since the development of heavy-haul railway in 1980s in China, heavy haul transportation lines such as Daqin Line, Shuohuang Line and Central and Southern Corridor of Shanxi Province have been built one after another. However with the increase of axle load more and more defects such as cracking breakage sinking and mud breaking on the base of tunnel appear. These diseases directly affect the safety and economy of freight transportation. This paper relies on the project of the National Natural Science Foundation of China Coal Joint Foundation (U1361204)-dynamic characteristics and adaptability of Railway Infrastructure under the condition of < 30t Axial load "and supported by the National Natural Science Foundation of China (51278494)-< bottom junction of heavy-haul railway tunnel Evolution Mechanism and Design method of structure Service performance. The dynamic response characteristics of heavy haul railway tunnel bottom structure are systematically analyzed. The main research results are as follows: (1) based on the existing heavy haul train and track parameters, the vehicle-track coupling dynamic model is established. The load time history curve of the heavy haul train acting on the tunnel bottom structure is obtained. (2) based on the design parameters of the existing heavy-haul railway tunnel, the three-dimensional dynamic analysis model of the heavy-haul railway tunnel is established, and the single model is analyzed. The influence of axle load on the dynamic response of tunnel bottom structure is obtained. (3) from the increment of displacement, acceleration and stress of tunnel bottom structure, the rise-span ratio of inverted arch is analyzed. The influence of the thickness of the filling layer, the thickness of the inverted arch and the thickness of the bottom laying on the dynamic response of the tunnel bottom structure of single and double lines heavy haul railway tunnel is obtained, and the influence of the design parameters on the dynamic response of the tunnel bottom structure is obtained. (4) the displacement and acceleration of the tunnel bottom structure, The effect of bedrock softening and void removal on the dynamic response of the tunnel bottom structure is analyzed in three aspects of stress increment. The influence of each factor of the bedrock on the dynamic response of the tunnel bottom structure is obtained. 78 figures, 40 tables, 94 refs
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451
本文编号：2275403
[Abstract]:Abstract: since the development of heavy-haul railway in 1980s in China, heavy haul transportation lines such as Daqin Line, Shuohuang Line and Central and Southern Corridor of Shanxi Province have been built one after another. However with the increase of axle load more and more defects such as cracking breakage sinking and mud breaking on the base of tunnel appear. These diseases directly affect the safety and economy of freight transportation. This paper relies on the project of the National Natural Science Foundation of China Coal Joint Foundation (U1361204)-dynamic characteristics and adaptability of Railway Infrastructure under the condition of < 30t Axial load "and supported by the National Natural Science Foundation of China (51278494)-< bottom junction of heavy-haul railway tunnel Evolution Mechanism and Design method of structure Service performance. The dynamic response characteristics of heavy haul railway tunnel bottom structure are systematically analyzed. The main research results are as follows: (1) based on the existing heavy haul train and track parameters, the vehicle-track coupling dynamic model is established. The load time history curve of the heavy haul train acting on the tunnel bottom structure is obtained. (2) based on the design parameters of the existing heavy-haul railway tunnel, the three-dimensional dynamic analysis model of the heavy-haul railway tunnel is established, and the single model is analyzed. The influence of axle load on the dynamic response of tunnel bottom structure is obtained. (3) from the increment of displacement, acceleration and stress of tunnel bottom structure, the rise-span ratio of inverted arch is analyzed. The influence of the thickness of the filling layer, the thickness of the inverted arch and the thickness of the bottom laying on the dynamic response of the tunnel bottom structure of single and double lines heavy haul railway tunnel is obtained, and the influence of the design parameters on the dynamic response of the tunnel bottom structure is obtained. (4) the displacement and acceleration of the tunnel bottom structure, The effect of bedrock softening and void removal on the dynamic response of the tunnel bottom structure is analyzed in three aspects of stress increment. The influence of each factor of the bedrock on the dynamic response of the tunnel bottom structure is obtained. 78 figures, 40 tables, 94 refs
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451
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