Chrome Extension
WeChat Mini Program
Use on ChatGLM
VIPCreated with Sketch.

    • Interfacial Properties of Double-Block Ballastless Track under Various Environmental Conditions

    Rui Zhou, Puyan Yang,Yang Li, YingGang Tao,Jingmang Xu,Zhihui Zhu

    International Journal of Mechanical Sciences（2023）

    Shenzhen Univ | Shijiazhuang Tiedao Univ | Southwest Jiaotong Univ | Natl Engn Res Ctr High speed Railway Construct Tec

    Cited 1|Views21
    Abstract
    The natural environment has a great effect on the interfacial bonding performance of ballastless track in highspeed railways, and the interfacial damage analysis models of the double-block ballastless track (DBBT) on subgrade with two connections and four interface conditions are proposed in this paper. Firstly, the cohesive zone models (CZM) parameters of two interfaces of the DBBT were calculated and the thermal responses of a 1/4 scaled DBBT in an outdoor natural environment were measured. After the validation of outdoor experimental results, the transient heat transfer models of the unitized and longitudinal DBBT with four interfacial CZMs were then established to study their interfacial damage properties under three elevated temperatures, respectively. Thermal responses of the unitized and longitudinal DBBT are also compared under the coupling effect of high temperature and humidity. Results show that the temperature and longitudinal stress generally decrease from the sleeper to the supporting layer in a natural environment. The CZM has a great effect on interfacial thermal responses, and the stresses of the track slab in the longitudinal DBBT are much larger than those of the unitized DBBT under three elevated temperatures. More importantly, the damage factors of the two interfaces of the unitized DBBT are much larger than those of the longitudinal DBBT, and the interfacial damage development of the two interfaces of the unitized DBBT is different from the longitudinal DBBT. In addition, the coupling effect of a high temperature and humidity could effectively increase the thermal responses of the track slab for two DBBTs, especially for the higher humidity that exceeds RH=65 % of the unitized DBBT.
    More
    Translated text
    Key words
    Outdoor nature experiment,Heat transfer model,Interface damage properties,Four interfacial conditions,High temperature and humidity coupling effect,Two types of DBBT
    求助PDF
    上传PDF
    View via Publisher
    Bibtex
    AI Read Science
    AI Summary
    AI Summary is the key point extracted automatically understanding the full text of the paper, including the background, methods, results, conclusions, icons and other key content, so that you can get the outline of the paper at a glance.
    Example
    Background
    Key content
    Introduction
    Methods
    Results
    Related work
    Fund
    Key content
    • Pretraining has recently greatly promoted the development of natural language processing (NLP)
    • We show that M6 outperforms the baselines in multimodal downstream tasks, and the large M6 with 10 parameters can reach a better performance
    • We propose a method called M6 that is able to process information of multiple modalities and perform both single-modal and cross-modal understanding and generation
    • The model is scaled to large model with 10 billion parameters with sophisticated deployment, and the 10 -parameter M6-large is the largest pretrained model in Chinese
    • Experimental results show that our proposed M6 outperforms the baseline in a number of downstream tasks concerning both single modality and multiple modalities We will continue the pretraining of extremely large models by increasing data to explore the limit of its performance
    Upload PDF to Generate Summary
    Must-Reading Tree
    Example
    Generate MRT to find the research sequence of this paper
    Related Papers

    Interfacial Failure Behavior of Longitudinally Coupled Slab Tracks Restored by Interface Adhesives

    Yang Li,Haiyan Li,Luming An,Jian Zhao,Xianfeng Shi, Emmanuel Walubita
    International Journal of Adhesion and Adhesives 2024

    被引用0

    Data Disclaimer
    The page data are from open Internet sources, cooperative publishers and automatic analysis results through AI technology. We do not make any commitments and guarantees for the validity, accuracy, correctness, reliability, completeness and timeliness of the page data. If you have any questions, please contact us by email: report@aminer.cn
    Chat Paper
    【要点】：本文提出了高速铁路无砟轨道双块式轨下基础环境条件下界面粘结性能的界面损伤分析模型，并通过1/4缩尺模型户外实验验证了模型参数，创新性地研究了四种界面粘结区模型（CZM）在三种升高温度下单元式和纵向双块式无砟轨道的瞬态热传递和界面损伤特性，以及高温高湿耦合作用下的界面热响应。
    

    【方法】：通过计算双块式无砟轨道（DBBT）两个界面的粘结区模型（CZM）参数，并测量户外自然环境下1/4缩尺DBBT的热响应，进而建立考虑四种界面CZM的单元式和纵向DBBT的瞬态热传递模型。
    

    【实验】：使用户外自然环境下的1/4缩尺DBBT模型进行实验，通过对比单元式和纵向DBBT在升高温度下的热响应，以及考虑高温高湿耦合作用下的界面热响应，发现界面粘结区模型对界面热响应有显著影响，且在升高温度下单元式DBBT的界面损伤因子大于纵向DBBT，界面损伤发展模式不同，同时高温高湿耦合作用可显著提升轨下基础的热响应，尤其是相对湿度超过65%时对单元式DBBT的影响更为显著。