Geological risk assessment of traffic engineering construction among 7.0-8.5 magnitude earthquake areas:Practice from the Sichuan-Tibet transport corridor in the eastern Tibetan Plateau

At least 13 active fault zones have developed in the Ya'an-Linzhi section of the Sichuan-Tibet transport corridor,and there have been undergone 17 MS≥7.0 earthquakes,the largest earthquake is 1950 Chayu MS 8.5 earthquake,which has very strong seismic activity.Therefore,carrying out engineering construction in the Sichuan-Tibet transport corridor is a huge challenge for geological technological personnel.To determining the spatial geometric distribution,activity of active faults and geological safety risk in the Sichuan-Tibet transport corridor.Based on remote sensing images,ground surveys,and chronological tests,as well as the deep geophysical and current GPS data,we investigated the geometry,segmentation,and paleoearthquake history of five major active fault zones in the Ya'an-Linzhi section of the Sichuan-Tibet transport corridor,namely the Xianshuihe,Litang,Batang,Jiali-Chayu and Lulang-Yigong.The five major fault zones are all Holocene active faults,which contain strike-slip components as well as thrust or normal fault components,and contain multiple branch faults.The Selaha-Kangding segment of the Xianshuihe fault zone,the Maoyaba and Litang segment of the Litang fault zone,the middle segment(Yigong-Tongmai-Bomi)of Jiali-Chayu fault zone and Lulang-Yigong fault zone have the risk of experiencing strong earthquakes in the future,with a high possibility of the occurrence of MS≥7.0 earthquakes.The Jinsha River and the Palong-Zangbu River,which is a high-risk area for geological hazard chain risk in the Ya'an-Linzhi section of the Sichuan-Tibet transport corridor.Construction and safe operation Ya'an-Linzhi section of the Sichuan-Tibet transport corridor,need strengthen analysis the current crustal deformation,stress distribution and fault activity patterns,clarify active faults relationship with large earthquakes,and determine the potential maximum magnitude,epicenters,and risk range.This study provides basic data for understanding the activity,seismicity,and tectonic deformation patterns of the regional faults in the Sichuan-Tibet transport corridor.

Innovative Measures Ensuring Integrity of the Entire Supply Chain or Transport Corridor

The EWTC （East-West Transport Corridor） in the Southem part of the Baltic Sea Region includes more effective testing area of new business models for collaborative logistics flows. Since the EWTC is a corridor requiring transport mode interchanges due to crossing the Baltic Sea, development of intermodal transport solutions making different transport modes fully integrated along the corridor is a key issue for the EWTC. To meet an increased global transport demand, ports and intermodal terminals need to make sure that their facilities are prepared for growth. Thus, for ports in the EWTC it is important to offer the services necessary for handling the maritime freight services （container ships, RoRo ships, railway ferries） demanded by transporters and transport buyers. IT services are needed to support transportation activities along the corridor. This is especially important for the EWTC due to its physical nature, interchange points, multi-language and cross boarder interaction. Information on a constantly updated traffic situation and interchange status, tracking of goods, booking and confirmation services, intelligent truck parking and services opening faster border crossing routes would ensure more efficient transportation and handling thereofi It is expected that the outcomes of the recently completed eMAR project will help to develop a modem Klaipeda Seaport community system as well as effective management architecture along the EWTC based on the CSW （Corridor Single Window） approach.

The Challenges of the ＂Development From Above＂ and ＂Development From Below＂ in the Lobito Transport Corridor （Angola）

As the efforts to modernize the Lobito Transport Corridor in Angola advance, people＇s lived experiences are shaped by the interactions between official ＂developments from above＂ efforts and a myriad of inventive, often messy, adaptations that could be seen as ＂developments from below＂. As a result of a combination of a variety of adaptive strategies （of coping and accumulating） pursued by diverse kinds of rural and urban Angolans and of official projects to improve transport infrastructure and services, a transformation of society is in progress. Beyond the obvious utilitarian function, the transport system provides a window on many socio-economic and political facets of the region. From an assessment of the dynamics, effects, impacts and linkages, the modernization of the Lobito Corridor can be made part of a sustainable development and poverty-reduction strategy in the development process. Nevertheless, those dynamics have not induced maximum multiplier effects in terms of increased employment and income earning opportunities of the poor despite their improved mobility. The transport economy is a site of capital accumulation and change where social stratification goes in parallel with increased socio-economic inequality and precarious conditions in the labor transport market. To some extent the government is bound to reinforce long continuities by improving infrastructure. People then adapt to this framework and it partly serves but partly constrains development. In this context, an improved regulatory and institutional framework for the transport system （top-down approach） and an integration of the non-formal dynamics that have been developed within the real transport system with the formal ones （bottom up-top approach） is essential.

The Challenges Faced on Transit Transport Corridors by Landlocked Countries in Central Africa: Literature Review

The landlocked countries are the one without access to the sea and can be assimilate as countries around the world with a disadvantage of geography situation location. Chad and the Central African Republic are two of the 40 landlocked countries around the world that transport 80% of their goods by road and rail, and as much as almost more than 50% of their passengers through a transit country with a transit transport system which is crucial for their trade and exchanges. The study aims to introduce the importance to have a good and efficiency transport network infrastructure in Central Africa to facilitate the trade for the landlocked countries of Central Africa (Chad and the Central African Republic), member of CEMAC trade area and proposes some measures that can be adopted to improve their conditions and ameliorate the trade for those countries.

Transport Corridor Alive With Possibilities

New Lamu Port infrastructure initiative has potential to improve the economies of East Africa East africa is gearing up to construct a trade lifeline that is set to be one of the largest transport projects in africa. In early February, Kenya, Ethiopia and south sudan launched construction of

Dynamic response of mountain tunnel,bridge,and embankment along the Sichuan-Tibet transportation corridor to active fault based on model tests

The Sichuan-Tibet transportation corridor is prone to numerous active faults and frequent strong earthquakes.While extensive studies have individually explored the effect of active faults and strong earthquakes on different engineering structures,their combined effect remains unclear.This research employed multiple physical model tests to investigate the dynamic response of various engineering structures,including tunnels,bridges,and embankments,under the simultaneous influence of cumulative earthquakes and stick-slip misalignment of an active fault.The prototype selected for this study was the Kanding No.2 tunnel,which crosses the Yunongxi fault zone within the Sichuan-Tibet transportation corridor.The results demonstrated that the tunnel,bridge,and embankment exhibited amplification in response to the input seismic wave,with the amplification effect gradually decreasing as the input peak ground acceleration(PGA)increased.The PGAs of different engineering structures were weakened by the fault rupture zone.Nevertheless,the misalignment of the active fault may decrease the overall stiffness of the engineering structure,leading to more severe damage,with a small contribution from seismic vibration.Additionally,the seismic vibration effect might be enlarged with the height of the engineering structure,and the tunnel is supposed to have a smaller PGA and lower dynamic earth pressure compared to bridges and embankments in strong earthquake zones crossing active faults.The findings contribute valuable insights for evaluating the dynamic response of various engineering structures crossing an active fault and provide an experimental reference for secure engineering design in the challenging conditions of the Sichuan-Tibet transportation corridor.

Potential seismic landslide hazard and engineering effect in the Ya’an-Linzhi section of the Sichuan-Tibet transportation corridor, China

The Sichuan-Tibet transportation corridor is located at the eastern margin of the Qinghai-Tibet Plateau,where the complex topography and geological conditions,developed geo-hazards have severely restricted the planning and construction of major projects.For the long-term prevention and early control of regional seismic landslides,based on analyzing seismic landslide characteristics,the Newmark model was used to carry out the potential seismic landslide hazard assessment with a 50-year beyond probability 10%.The results show that the high seismic landslide hazard is mainly distributed along large active tectonic belts and deep-cut river canyons,and are significantly affected by the active tectonics.The low seismic landslide hazard is mainly distributed in the flat terrain such as the Quaternary basins,broad river valleys,and plateau planation planes.The major east-west linear projects mainly pass through five areas with high seismic landslide hazard:Luding-Kangding section,Yajiang-Xinlong(Yalong river)section,Batang-Baiyu(Jinsha river)section,Basu(Nujiang river)section,and Bomi-Linzhi(eastern Himalaya syntaxis)section.The seismic action of the Bomi-Linzhi section can also induce high-risk geo-hazard chains such as the high-level glacial lake breaks and glacial debris flows.The early prevention of seismic landslides should be strengthened in the areas with high seismic landslide hazard.

Development characteristics and failure modes of reactivated ancient landslides in the Sichuan–Tibet transportation corridor,China

The risk of reactivated ancient landslides in the Sichuan–Tibet transportation corridor in China is significantly increasing,primarily driven by the intensification of engineering activities and the increased frequency of extreme weather events.This escalation has resulted in a considerable number of fatalities and extensive damage to critical engineering infrastructure.However,the factors contributing to the reactivation and modes of destruction of ancient landslides remain unknown.Therefore,it is imperative to systematically analyze the developmental characteristics and failure modes of reactivated ancient landslides to effectively mitigate disaster risks.Based on a combination of data collection,remote sensing interpretation,and field investigations,we delineated the developmental attributes of typical ancient landslides within the study area.These attributes encompass morphological and topographic aspects,material composition,and spatial structure of ancient landslides.Subsequently,we identified the key triggers for the reactivation of ancient landslides,including water infiltration,reservoir hydrodynamics,slope erosion,and excavation,by analyzing representative cases in the study area.Reactivation of ancient landslides is sometimes the result of the cumulative effects of multiple predisposing factors.Furthermore,our investigations revealed that the reactivation of these ancient landslides primarily led to local failures.However,over extended periods of dynamic action,the entire zone may experience gradual creep.We categorized the reactivation modes of ancient landslides into three distinct types based on the reactivation sequences:progressive retreat,backward thrusting,and forward pulling–backward thrusting.This study is of great significance for us to identify ancient landslides,deepen our understanding of the failure modes and risks of reactivated ancient landslides on the eastern margin of the Tibetan Plateau,and formulate effective disaster prevention and mitigation measures.

Ecological vulnerability assessment of the Ya'an-Qamdo section along the southern route of the Sichuan-Tibet transportation corridor

Identifying the ecological vulnerability of the sensitive and fragile ecosystem of the Ya’anQamdo section along the southern route of the Sichuan-Tibet transport corridor is of paramount importance to reduce environmental damage resulting from infrastructure construction.This paper divided the Ya’an-Qamdo transport section into 22subzones according to their ecological environment characteristics.Based on the vulnerability evaluation model established by the fuzzy matter-element analysis method,the eight main assessment indicators of ecological vulnerability were windstorm,rainstorm,snowstorm,extreme temperature,extreme air pressure,geological hazard,natural conditions,and social resources.The rating and ranking of vulnerability in each subzone were based on the weight of the judgment indicators.Scientific processes were used to verify the rationality of both the indicators themselves and their weights.The results of this study show that subzone 9,located in the subalpine cold and humid forest and scrubland zone,is the most vulnerable,and subzone 1,located in the low-to mid-land warm and humid forest zone,is the least vulnerable.The conclusion of the study suggests that targeted measures of ecological protection should be formulated before development and construction of major transportation infrastructure.Construction should evade the most vulnerable areas,and in-depth research on ecological restoration should be carried out in low-to midvulnerability areas so that the ecological environment along the route can be protected effectively for sustainable economic and social development.

关于打通铁路网运输能力堵点对策探究

国铁企业落实党中央部署要求并加快推进铁路货运市场化改革,采取有效措施尽快打通铁路网运输能力堵点,有效降低物流成本。通过分析路网总体规模、旅客运输供给能力、货物运输保障能力等铁路网运输能力现状,剖析铁路网运输能力堵点及成因。在此基础上,提出加强铁路网运输能力经验借鉴,探析打通铁路网运输能力堵点对策,即:畅通普速干线通道,加强煤运通道能力保障,强化中欧班列通道能力,完善港口铁路通过能力,增强西部陆海新通道线路能力,完善枢纽点线配套能力,强化铁路货运设施设备卸车能力等方面,在助力降低全社会物流成本中发挥“火车头”的重要作用。

长三角内河集装箱运输通道布局研究

长三角内河集装箱运输不仅是建设长三角世界级港口群、助力长三角综合立体交通及经济一体化发展的重要组成部分,也是运输结构调整、节能减排降碳的重要方向,符合国家战略导向。通过分析长三角内河集装箱运输发展特点,结合内河集装箱运输通道布局的影响因素,通过定性定量相结合的三阶段分析方法,确定长三角内河集装箱主要运输通道的布局层次,在此基础上提出编制长三角内河集装箱运输通道布局规划、高标准贯通主要通道建设、完善优化物流组织体系以及建立区域集装箱一体化发展机制等建议。

国际南北运输走廊发展进程与前景分析

俄乌冲突爆发后,西方国家对俄制裁趋于常态化,欧亚运输网络中经俄罗斯进入欧洲的运输路线遭遇阻碍。在此背景下,联通波罗的海、里海、印度洋的南北向国际运输走廊地缘战略意义得到提升。以俄罗斯、伊朗、印度为代表的国家正将国际南北运输走廊建设重新提上议事日程,试图在新的动荡变革时期寻求新的战略通道突破,为贸易发展与能源领域合作创造机遇。当前,国际南北运输走廊沿线国家的主观建设需求显著提升,但沿线国家发展走廊的主观需求与客观建设能力及货运需求不匹配的核心问题短期内难以解决。长远来看,国际南北运输走廊以里海—中亚为轴心,拥有与传统欧亚运输线路对接的重要潜力,有望促进欧亚运输体系的多象限发展,深度激发欧亚大陆的国际物流大通道作用。国际南北运输走廊辐射面广,需要沿线及辐射地区国家齐心协力积极应对复杂局面,共同营造多方共赢的开放发展格局。为发挥更为巨大的联通效应,国际南北运输走廊的未来发展离不开与“一带一路”倡议的务实对接。

中欧班列开通对中国城市出口结构升级的影响研究

利用双重差分模型,实证检验了中欧班列开通对中国城市出口结构升级的影响,并探讨背后的相关机制。研究表明,中欧班列开通能够显著促进中国城市出口结构的升级,多种稳健性检验方法下研究结论依然成立。机制检验表明,城市资源配置效率提高和城市创新水平提升是城市开通中欧班列促进出口结构升级的有效途径。进一步分析表明,中欧班列开通的影响效应存在非均衡性特征,西部城市、非资源型城市和中心节点城市更易享有政策红利。

考虑风向不确定性的航班时刻优化

针对风向的不确定会影响航班的飞行时间和到达走廊口的时刻,造成走廊口出现流量过饱和的现象,提出基准风向的概念,并统计整个航季不同月份的基准风向概率;其次依据基准风向概率,以误差平方和与轮廓系数为指标将所有月份聚类为三类;然后基于聚类结果建立考虑风向不确定性的走廊口流量风险模型,并设计了改进粒子群算法实现模型求解;最后以首都机场的航班时刻表为例进行验证。研究表明:上述模型可以在一定程度上缓解风向不确定导致的走廊口流量饱和问题,增强航班时刻表的鲁棒性。相比初始航班时刻表,不同基准风向时的走廊口流量方差分别降低26%和14%,超出走廊口容量的总航班量减少45%。

中尼交通廊道建设对周边植被生态环境的影响分析

本研究聚焦于中尼交通廊道建设对周边植被覆盖度(FVC)的影响,FVC是评估交通基础设施建设对植被生态环境影响的重要指标。采用GEE平台处理并分析1992-2022年的数据,利用地理探测器比较分析了自然因素和道路因素对植被的影响。结果显示,2005年前植被覆盖度下降约17%,之后呈上升趋势,2020年达峰值。植被覆盖度随到公路距离呈先减后增趋势,表明人类活动在受自然条件限制时对植被覆盖度有不同影响。地理探测器揭示自然因子是影响植被覆盖度的主要因素,公路距离的影响相对较小。研究结果强调了自然条件在植被生态变化中的主导作用,并为相应生态环境改善提供科学依据。

轨道交通数字化规划研究——交通走廊分析与线路布局

为实现轨道交通与城市空间的有效融合,发挥交通走廊对城市发展的引领作用,文章在阐述交通走廊概念及其与轨道交通线路互动机理的基础上,提出通过交通走廊功能及公交特征分析,确定轨道交通线路功能、服务水平、线站位方案、技术标准等的研究思路;然后将数据分析方法与空间模型应用在交通走廊分析中,以厦门市为例,开展基于空间计量学的交通走廊功能分析、基于公交特征的线路功能分析、交通走廊量级与轨道交通层次制式的匹配分析,以指导轨道交通线路布局。研究结果表明,利用空间计量学、公交刷卡数据分析等量化研究方法,能够全面、有效地反映交通走廊特征,为轨道交通线路功能识别、客流预测、线站位布局、制式选择、技术标准确定提供依据。

中尼交通廊道318国道沿线泥石流分布及特征数据集(2022年)

中尼交通廊道地区在特殊的地理地质环境限制下,缺乏可信且较为完整的泥石流分布数据。本数据集是基于泥石流早期识别和野外实地调查,结合数字高程模型(DEM)和地质图,得到的1990年至2022年中尼交通廊道318国道沿线范围内的泥石流编目及特征信息。泥石流流域的提取主要采用Arc GIS中的水文分析方法,考虑到DEM的精度限制,结合Google Earth影像进行必要的人工校正。降水和温度参数信息取自1980–2009年共30年的国家气象站点实况数据内插年降水数据和年气温数据,断层分布信息来自中国地质调查局发布的《中国1∶50万数字地质图》,地形信息来自12.5 m分辨率的ALOS DEM数据。在28.0°–29.4°N,85.1°–88.9°E范围内,共提取255条泥石流记录,覆盖面积为1660.73 km^(2)。本数据集包含中尼交通廊道318国道沿线泥石流主要分布范围的矢量文件、泥石流目录矢量文件、泥石流参数特征文档3个文件。本数据集均经过现场实地调查、确认,数据信息可靠,可作为基础数据集,应用到该地区的泥石流研究中。

晋陕蒙地区煤炭运输通道运营对策研究

晋陕蒙地区煤炭运输通道的建设是落实国家“双碳”战略导向、运输结构调整政策,健全煤炭内循环体系的重要组成部分。基于保障国家能源安全战略目标,结合现阶段晋陕蒙地区煤炭生产布局调整及能源安全,分析晋陕蒙地区煤炭运输通道功能分工及运输通道症结,根据晋陕蒙地区煤炭产销结构与趋势分析及煤炭运输通道外运量预测,提出晋陕蒙地区铁路煤炭运输通道格局调整优化方案,从煤运通道需求、运输企业运营2个方面,提出打通运输市场隐形“瓶颈”,合理分流公路运量,降低铁路运营成本,提高铁路运输效率,优化铁路运输结构等运营对策。

郑州航空港经济综合实验区轨道交通线网优化

轨道交通作为城市交通的主动脉,承担着城市公共交通主骨架作用,是提高群众生活品质的民生工程,也是提升城市品质和竞争力的基础工程。通过对郑州市既有轨道交通线网规划适应性进行分析,论证航空港区轨道交通线网优化的必要性。借鉴国内外类似城市轨道交通发展经验,提出航空港区三级六类轨道交通功能层级。采用多种方法预测航空港区轨道交通线网规模。秉承分层级、先对外、后对内的规划思路以及对外强联系、内部成体系的优化理念,按照区域协同、组团融合、服务优化的优化策略,对城市轨道交通快线A、快线B以及普速线路提出优化方案,并对线路运营组织提出合理化建议。优化后航空港区轨道交通线网规模274.8 km,串联重要节点和组团中心,覆盖主次客流走廊,对建设“轨道上的航空港区”具有重要意义。

“双碳”目标下中蒙煤炭铁路运输通道发展前景分析

中蒙间加强煤炭贸易合作是落实两国元首会晤精神的重要方面,而铁路运输通道是保障煤炭贸易的物流基础设施。从煤电功能定位和达峰时间两个方面分析“双碳”目标下煤炭行业发展前景,分析进口煤市场结构将对国内市场带来三个影响:海运进口煤对沿海市场的挤压作用和不确定因素同步增强,优质炼焦煤对进口将长期依赖,我国煤炭进口的不确定性进一步增加。从蒙古国煤炭供需运现状、蒙古国铁路网规划建设现状、中蒙煤运通道互联互通现状三方面梳理了中蒙煤炭铁路运输通道现状,提出铁路运输通道建设的影响因素以及煤炭铁路运输通道的发展建议。