Railway Engineering Science最新文献_第2页

Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel 探索预应力锚索作为超大跨度隧道开挖临时支护替代方案的可行性

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-06-05 DOI: 10.1007/s40534-024-00340-w

Shunhua Zhou, Yuyin Jin, Zhiyao Tian, Chunhua Zou, Heming Zhao, Zengrun Miao

{"title":"Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel","authors":"Shunhua Zhou, Yuyin Jin, Zhiyao Tian, Chunhua Zou, Heming Zhao, Zengrun Miao","doi":"10.1007/s40534-024-00340-w","DOIUrl":"https://doi.org/10.1007/s40534-024-00340-w","url":null,"abstract":"Excavating super-large-span tunnels in soft rock masses presents significant challenges. To ensure safety, the sequential excavation method is commonly adopted. It utilizes internal temporary supports to spatially partition the tunnel face and divide the excavation into multiple stages. However, these internal supports generally impose spatial constraints, limiting the use of large-scale excavation equipment and reducing construction efficiency. To address this constraint, this study adopts the “Shed-frame” principle to explore the feasibility of an innovative support system, which aims to replace internal supports with prestressed anchor cables and thus provide a more spacious working space with fewer internal obstructions. To evaluate its effectiveness, a field case involving the excavation of a 24-m span tunnel in soft rock is presented, and an analysis of extensive field data is conducted to study the deformation characteristics of the surrounding rock and the mechanical behavior of the support system. The results revealed that prestressed anchor cables integrated the initial support with the shed, creating an effective “shed-frame” system, which successively maintained tunnel deformation and frame stress levels within safe regulatory bounds. Moreover, the prestressed anchor cables bolstered the surrounding rock effectively and reduced the excavation-induced disturbance zone significantly. In summary, the proposed support system balances construction efficiency and safety. These field experiences may offer valuable insights into the popularization and further development of prestressed anchor cable support systems.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":null,"pages":null},"PeriodicalIF":6.3,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141259581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flow and sound fields of scaled high-speed trains with different coach numbers running in long tunnel 不同车厢号的按比例高速列车在长隧道中运行时的流场和声场

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-06-05 DOI: 10.1007/s40534-024-00330-y

Qiliang Li, Yuqing Sun, Menghan Ouyang, Zhigang Yang

{"title":"Flow and sound fields of scaled high-speed trains with different coach numbers running in long tunnel","authors":"Qiliang Li, Yuqing Sun, Menghan Ouyang, Zhigang Yang","doi":"10.1007/s40534-024-00330-y","DOIUrl":"https://doi.org/10.1007/s40534-024-00330-y","url":null,"abstract":"Segregated incompressible large eddy simulation and acoustic perturbation equations were used to obtain the flow field and sound field of 1:25 scale trains with three, six and eight coaches in a long tunnel, and the aerodynamic results were verified by wind tunnel test with the same scale two-coach train model. Time-averaged drag coefficients of the head coach of three trains are similar, but at the tail coach of the multi-group trains it is much larger than that of the three-coach train. The eight-coach train presents the largest increment from the head coach to the tail coach in the standard deviation (STD) of aerodynamic force coefficients: 0.0110 for drag coefficient (Cd), 0.0198 for lift coefficient (Cl) and 0.0371 for side coefficient (Cs). Total sound pressure level at the bottom of multi-group trains presents a significant streamwise increase, which is different from the three-coach train. Tunnel walls affect the acoustic distribution at the bottom, only after the coach number reaches a certain value, and the streamwise increase in the sound pressure fluctuation of multi-group trains is strengthened by coach number. Fourier transform of the turbulent and sound pressures presents that coach number has little influence on the peak frequencies, but increases the sound pressure level values at the tail bogie cavities. Furthermore, different from the turbulent pressure, the first two sound pressure proper orthogonal decomposition (POD) modes in the bogie cavities contain 90% of the total energy, and the spatial distributions indicate that the acoustic distributions in the head and tail bogies are not related to coach number.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":null,"pages":null},"PeriodicalIF":6.3,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141259477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study and numerical simulation of the impact of under-sleeper pads on the dynamic and static mechanical behavior of heavy-haul railway ballast track 轨枕下垫对重载铁路无砟轨道动静态机械性能影响的实验研究与数值模拟

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-05-25 DOI: 10.1007/s40534-024-00337-5

Yihao Chi, Hong Xiao, Yang Wang, Zhihai Zhang, Mahantesh M. Nadakatti

{"title":"Experimental study and numerical simulation of the impact of under-sleeper pads on the dynamic and static mechanical behavior of heavy-haul railway ballast track","authors":"Yihao Chi, Hong Xiao, Yang Wang, Zhihai Zhang, Mahantesh M. Nadakatti","doi":"10.1007/s40534-024-00337-5","DOIUrl":"https://doi.org/10.1007/s40534-024-00337-5","url":null,"abstract":"Laying the under-sleeper pad (USP) is one of the effective measures commonly used to delay ballast degradation and reduce maintenance workload. To explore the impact of application of the USP on the dynamic and static mechanical behavior of the ballast track in the heavy-haul railway system, numerical simulation models of the ballast bed with USP and without USP are presented in this paper by using the discrete element method (DEM)—multi-flexible body dynamic (MFBD) coupling analysis method. The ballast bed support stiffness test and dynamic displacement tests were carried out on the actual operation of a heavy-haul railway line to verify the validity of the models. The results show that using the USP results in a 43.01% reduction in the ballast bed support stiffness and achieves a more uniform distribution of track loads on the sleepers. It effectively reduces the load borne by the sleeper directly under the wheel load, with a 7.89% reduction in the pressure on the sleeper. Furthermore, the laying of the USP changes the lateral resistance sharing ratio of the ballast bed, significantly reducing the stress level of the ballast bed under train loads, with an average stress reduction of 42.19 kPa. It also reduces the plastic displacement of ballast particles and lowers the peak value of rotational angular velocity by about 50% to 70%, which is conducive to slowing down ballast bed settlement deformation and reducing maintenance costs. In summary, laying the USP has a potential value in enhancing the stability and extending the lifespan of the ballast bed in heavy-haul railway systems.","PeriodicalId":41270,"journal":{"name":"Railway Engineering Science","volume":null,"pages":null},"PeriodicalIF":6.3,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141151943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanism of cross-level settlements and void accumulation of wide and conventional sleepers in railway ballast 铁路道碴中宽轨枕和传统轨枕的跨层沉降和空隙积累机理

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-04-22 DOI: 10.1007/s40534-024-00329-5

O. Nabochenko, M. Sysyn, Norman Krumnow, Szabolcs Fischer

引用次数: 0

NeTrainSim: a network-level simulator for modeling freight train longitudinal motion and energy consumption NeTrainSim：模拟货运列车纵向运动和能耗的网络级模拟器

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-04-09 DOI: 10.1007/s40534-024-00331-x

Ahmed S. Aredah, Karim Fadhloun, H. Rakha

引用次数: 0

The effectiveness of different wear indicators in quantifying wear on railway wheels of freight wagons 不同磨损指标在量化铁路货车车轮磨损方面的有效性

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-04-09 DOI: 10.1007/s40534-024-00334-8

Philipe Augusto de Paula Pacheco, M. Magelli, Matheus Valente Lopes, P. Corrêa, N. Zampieri, N. Bosso, A. A. dos Santos

引用次数: 0

Simplified prediction models for acoustic installation effects of train-mounted equipment 列车安装设备的声学安装效应简化预测模型

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-04-09 DOI: 10.1007/s40534-024-00333-9

David J. Thompson, Dong Zhao, G. Squicciarini

引用次数: 0

Parametric investigation of railway fastenings into the formation and mitigation of short pitch corrugation 铁路扣件形成和减轻短节距波纹的参数调查

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-03-17 DOI: 10.1007/s40534-024-00332-w

Pan Zhang, Shaoguang Li, R. Dollevoet, Zili Li

引用次数: 0

Numerical modeling techniques for noise emission of free railway wheels 自由铁路车轮噪声排放的数值建模技术

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-03-05 DOI: 10.1007/s40534-023-00327-z

Linus Taenzer, Urs Pachale, Bart Van Damme, Andrea Bergamini, Domenico Tallarico

引用次数: 0

A discussion about the limitations of the Eurocode’s high-speed load model for railway bridges 关于欧洲规范铁路桥梁高速荷载模型局限性的讨论

IF 6.3 1区工程技术

Railway Engineering Science Pub Date : 2024-02-28 DOI: 10.1007/s40534-023-00321-5

G. Ferreira, P. Montenegro, José Rui Pinto, António Abel Henriques, R. Calçada

引用次数: 0