高速列车-轨道系统地震波激励下计算机仿真研究     

姜福香  岳渠德  王玉田 《世界地震工程》2003,19(3):139-143

本文在列车—轨道三维耦合动力学模型的基础上，对地震波激励下高速列车—轨道系统的响应及防灾进行了计算机仿真研究，得出了初步结论。  相似文献   

A Geographical Analysis of Potential Railway Load Centers in China*     

Becky P. Y. Loo  Kai Liu 《The Professional geographer》2005,57(4):558-579

Railway containerization is important to the development of an efficient inland‐port distribution (IPD) system in China. After reviewing the general transportation network evolution and local circumstances, a strategy of focusing the limited capital investment at a few railway stations with the highest potential to develop into land‐based load centers (LLCs) was proposed. The fifteen major railway stations designated in the 2002 Plan form the basis for an evaluation. With the application of geographic information systems (GIS), each station's potential to become a LLC is evaluated under infrastructural, economic, logistics, and capacity dimensions. The 250‐ and 500‐km hinterland scenarios are considered.  相似文献   

Paleosubsidence and active subsidence due to evaporite dissolution in the Zaragoza area (Huerva River valley, NE Spain): processes, spatial distribution and protection measures for transport routes     

Jesús Guerrero  Francisco Gutirrez  Pedro Lucha 《Engineering Geology》2004,72(3-4):309-329

The lowest 17-km long reach of the Huerva River valley, down to its confluence with the Ebro River in Zaragoza city, flows across salt-bearing evaporites of the Ebro Tertiary Basin (NE Spain). Upstream, the horizontally lying Miocene evaporites are interfingered with non-soluble distal alluvial fan facies (shales and sandstones). The proportion of soluble facies in the Huerva River valley increases in a downstream direction towards the basin depocenter. On the basis of the type and magnitude of the paleosubsidence features, the valley has been divided into four reaches. Along reach I, undeformed terrace deposits less than 4 m thick rest on insoluble detrital bedrock. In reaches II and III, dissolution at the alluvium–bedrock boundary has generated local thickening, deformation and paleocollapse structures, which only affect the alluvial mantle. In reach IV, terrace deposits thicken to over 60 m resulting from a large-scale synsedimentary subsidence. In this sector, subsidence locally affects to both the alluvium and the underlying bedrock. This indicates that dissolution acts at the rockhead beneath the alluvial cover (alluvial karst) and within the evaporitic substratum (interstratal karst). The development of an intraevaporitic karst in reach IV is attributed to gypsum and salt dissolution. Irregular terrace gravel bodies (gravel pockets) embedded in a fine-grained matrix associated with paleocollapse structures have been interpreted as liquefaction–fluidization structures resulting from ground acceleration and suction induced by catastrophic collapses. Subsidence is currently active in the region affecting areas with a thin alluvial cover in reaches III and IV. The low subsidence activity in most of Zaragoza city is explained by the presence of thickened (around 50 m) and indurated alluvial deposits. In the surrounding area, numerous buildings in Cadrete and Santa Fe villages have been severely damaged by subsidence. Natural and human-induced subsidence favours the development of slope movements in the gypsum scarp overlooking Cadrete village. Several transport routes including the Imperial Canal (irrigation canal) and the recently completed Madrid–Barcelona high-speed railway are affected by human-induced sinkholes. The paleocollapse structures exposed in the trenches of this railway and a ring road under construction point to hazardous locations underlain by cavities and collapse structures where special protection measures should be applied. Rigid structures are recommended beneath the high-speed railway with sufficient strength to span the larger sinkholes with no deformation. Electronic monitoring devices linked to a warning system can detect subtle subsidence-induced deformations in carriageways or railways. This research demonstrates that the study of the paleokarst helps to understand the processes involved in the present-day subsidence phenomena and their general spatial distribution.  相似文献   

兰新线玉门段防护体系经济效益分析     

张宏川  杨爱军 《中国沙漠》1998,18(4):390-393

兰新线玉门段防护体系的主要组成部分是阻（固）沙带和防风带。调查计算了体系中各措施的防护周期、截沙量、林带对风速的影响及成本投资,从防护效果和成本两方面进行经济价值分析,为建造经济型铁路防护体系提供科学依据。  相似文献   

青藏铁路可调式通风管路基的数值仿真分析     

李国玉  李宁  全晓娟 《冰川冻土》2004,26(Z1):108-114

Finite Element Method has been used to operate the numerical analysis and comparison between the traditional ventilated embankment and the adjustable ventilated embankment adopted in Qinghai-Tibet Railway construction. The numerical results show that: 1) The adjustable ventilated embankments can prevent the thermal entry from air into ducts during summer from thawing the permafrost beneath the embankments; 2) The cooling effects of the adjustable ventilated embankments on permafrost is much better than the traditional ventilated embankments although two kinds of embankments can generate the thawing bulbs at the beginning of finishing construction; 3) The drop of the mean temperature of permafrost under the adjustable ventilated embankments keeps faster than that of the mean temperature of permafrost under the traditional ventilated embankments. It is clear that the adjustable ventilated embankments can keep the embankment more stable than the traditional ventilated embankments.  相似文献   

Effects of sunspot cycle length and CO2 on air temperature along Qinghai-Xizang railway and air temperature''s trend prediction   总被引：15，自引：0，他引：15  

Li Dongliang  GUO Hui  WANG Wen  WEI Li 《中国科学D辑(英文版)》2004,47(Z1)

There are well coherences between annual averaged air temperatures at every meteorological station along the Qinghai-Xizang railway, and its 10-year moving average correlation coefficient is 0.92. Thus, the regional averaged annual mean temperature series along the Qinghai-Xizang railway (Trw) from 1935 to 2000 are constructed. The investigation is suggested that: Trw had significant responses to the 5-year lagged sunspot cycle length (SCL) and 15-year lagged concentration of atmospheric carbon dioxide (CO2), and the correlation coefficients between them are -0.76 (SCL) and 0.88 (CO2), respectively. The future SCL is predicted by the model of average generated function constructed with its main cycles of 76a, 93a, 108a, 205a and 275a. The result shows that the SCL would be becoming longer in the first half of the 21st century, and then it could be becoming shorter in the second half of the 21st century. Based on the natural change of SCL and the effect of double CO2 concentration, Trw in the 21st century is forecasted. It could warm up about 0.50℃ in the first half of the 21st century compared with the last decade of last century. The mean maximum air temperature could be likely about 0.20℃ in July and from 0.40℃ to 1.10℃ in January. The annual air temperature difference would likely reduce 0.3-1.00℃. The probability of above predictions ranges from 0.64 to 0.73.  相似文献   

GNSS/INS多传感器组合高速铁路轨道测量系统     

黎奇  白征东  陈波波  过静珺  辛浩浩  程宇航  黎琼  吴斐 《测绘学报》2020,49(5):569-579

高速铁路轨道必须保持高平顺性、高稳定性和高可靠性,这直接关系到高速列车高速、安全且平稳运行。高速铁路轨道测量至少包括控制测量、线路测量和变形测量等工作。传统高速铁路轨道测量方法存在测量周期长、维护成本高、检测效率低等问题。为此,本文提出了一种基于全球导航卫星系统(global navigation satellite system,GNSS)/惯性导航系统(inertial navigation system,INS)多传感器组合的高速铁路轨道测量方法,并研制了相应的轨道测量系统。本文详细介绍了其主要构成和方法流程,并在实际高速铁路轨道精调工程中进行了应用示范。结果表明:该系统实现了轨道路基变形监测和高速铁路轨道不平顺绝对测量与相对测量的一体化,其轨道横向偏差精度2 mm、垂向偏差精度2 mm,变形点水平方向精度1 mm、垂直方向精度1.5 mm,显著提高了测量效率。  相似文献   

Analysis of Power Supply Interference of Geomagnetic Second Data Observation-Take Changli Seismic Station as An Example     

TONG Xin  ZHOU Jianqing  LIU Zhe  ZHANG Guoling  GUO Jianfang 《中国地震研究》2020,34(2):240-254

This paper analyzes two types of power supply interference encountered in the observation of geomagnetic second data:the HVDC interference and the discharge interference of electrified railway. By taking the FGM fluxgate magnetometer of Changli Seismic Station as the research object, we analyze interference characteristics and conduct intensive observational experiment of electrified railway interference. Finally, several conclusions are obtained:① HVDC interference is closely related to the changes in the current system of the interference source, such as current size, distance or orientation of the interference source. Although the characteristics of each change are not the same, the main changes are variable. ② The discharge phenomenon caused by the contact of the pantograph system or other reasons during the operation of the electrified railway is a factor that may cause random small interference in the geomagnetic second data at Changli Seismic Station. This study explains similar phenomena discovered in previous years and meanwhile correct previous misjudgments including unstable working systems, unstable power supply, and occasional sudden jumps that are considered to be discrete.  相似文献   

宝成铁路滑坡与降雨关系探讨   总被引：6，自引：0，他引：6  

鄢毅 《水文地质工程地质》1993,20(4):14-16

本文在阐述宝鸡—成都铁路滑坡特点基础上,运用典型滑坡实例,重点讨论、分析滑坡与降雨的关系,拟定出导致滑坡发生、发生的降雨模式。  相似文献   

寒冻地区铁路隧道气温状态   总被引：7，自引：0，他引：7  

乜风鸣 《冰川冻土》1988,(4)

本文根据实测资料论述了寒冻地区铁路隧道内的气温状态,给该地区隧道防冻及排水设计提供了依据,并指出在寒冻地区非多年冻土中开挖隧道后有可能形成多年冻土。  相似文献