Comparative Study Of Different Ventilation Methods During Tunnel Construction,
2024
Guangdong Changzheng Construction Co .， Ltd.， Zhuhai， Guangdong 519000， China
Comparative Study Of Different Ventilation Methods During Tunnel Construction, Yue Kun, Bao Xiaohua, Ao Xiang, Liu Kuan, Wu Han, Li Tao, Shen Jun
Journal of China & Foreign Highway
The continuous improvement of tunnel construction technology brings a rapid increase in the speed and mileage of tunnel excavation，during which ventilation is a main problem affecting construction efficiency and safety.Taking the Zhuhai Xingye Express （West Line ） tunnel project as an example，this paper studied the influences of forced ventilation，exhaust ventilation，and hybrid ventilation on the dilution and discharge of harmful gas CO near the tunnel face and the wind speed in the tunnel.The results show that hybrid ventilation performs better in CO dilution，while exhaust ventilation has higher CO emission efficiency with a lower wind speed near the working face.Therefore，although forced ventilation …
Stability Of Excavation Face Of Double‑Mode Shield In Earth Pressure Mode Crossing Fault Zone Of Pearl River,
2024
China Railway First Group Co ., Ltd., Xi’an, Shaanxi 710054 , China
Stability Of Excavation Face Of Double‑Mode Shield In Earth Pressure Mode Crossing Fault Zone Of Pearl River, Tong Bin, Zhang Bin, Zhu Hanbiao, Wang Shuying
Journal of China & Foreign Highway
In view of the stability of the excavation face of the double-mode shield crossing the fault zone of the Pearl River，the project of the section from Hongshengsha Station to Yufengwei Station of the second phase of Guangzhou Metro Line Seven was studied.Through numerical simulations conducted to analyze the whole area and the local high-risk area of the shield crossing the fault zone of the Pearl River，this paper explored the construction risk of the shield crossing process.Besides，this paper analyzed the influence of different support stresses and grouting pressures on the stability of the excavation face and ground deformation，and finally，the tunneling parameters …
Development Trend On Raw Materials Market Of Ready‑Mixed Concrete Under Green Construction,
2024
Hunan No . 6 Engineering Co ., Ltd., Changsha , Hunan 410015 , China
Development Trend On Raw Materials Market Of Ready‑Mixed Concrete Under Green Construction, Ding Hu, Ding Qingjun, Lin Haojun, Zhang Zhen
Journal of China & Foreign Highway
In the face of resource depletion，high energy consumption in production，high carbon emissions，and serious pollution brought by traditional pumpcrete raw materials，a variety of new raw materials have been gradually developed and promoted to conform with the green construction promoted by China ’s civil engineering industry，witnessing a stable increase in quality，output，and social recognition.High-quality natural river sand and pebbles are in short supply at the origin，and they can be explored in old silted river channels.Gravel and manufactured sand produced using large particle size natural pebbles，limestone，construction waste，and others as raw materials will become new substitutes.In the transformation and upgrading of production enterprises which tend …
Review Of Snow And Ice Melting Techniques For Road And Bridge In Cold Regions,
2024
School of Architecture and Civil Engineering , Xi’an University of Science and Technology , Xi’an, Shaanxi 710054 , China
Review Of Snow And Ice Melting Techniques For Road And Bridge In Cold Regions, Tang Liyun, Shao Haitao, Tang Huaming, Qiu Peiyong, Du Xiaoqi, Zhang Lei, Peng Hui
Journal of China & Foreign Highway
Snow and ice melting of road and bridge surfaces is crucial for traffic safety，but current research on snow and ice melting techniques mainly focuses on engineering effects and technical evaluation，without the analysis and elaboration from the perspective of their mechanisms.To this end，based on the different mechanisms，this study divided snow and ice melting techniques into three types and summarized them：passive deicing，active deicing，and energy utilization deicing.This study systematically evaluated the advantages and disadvantages of traditional deicing methods such as deicing agents and mechanical deicing，analyzed two active deicing techniques，namely inhibitive freezing pavement and phase change material pavement，discussed the environmental-friendly method for road deicing …
Post‑Evaluation Method For Decision‑Making And Implementation Of Highway Maintenance Projects Based On Ahp‑Dematel,
2024
Changsha Science and Technology Testing Consulting Co ., Ltd., Changsha , Hunan 410114 , China
Post‑Evaluation Method For Decision‑Making And Implementation Of Highway Maintenance Projects Based On Ahp‑Dematel, Yu Wei, Yang Na, Li Jue
Journal of China & Foreign Highway
Addressing the current lack of post-evaluation management systems related to highways，particularly highway maintenance，this paper proposed a post-evaluation method for the decision-making and implementation of highway maintenance projects based on the combination of analytic hierarchy process （AHP） and decision-making trial and evaluation laboratory （DEMATEL ）.After building a post-evaluation model for the decision-making and implementation of highway maintenance projects and designing the evaluation process，this paper calculated key factors influencing the post-evaluation of the decision-making and implementation of highway maintenance projects and their respective comprehensive weights.The research results indicate that decision-making can possess higher accuracy and efficiency under the above calculation method，providing a …
Asphalt Binder Laboratory Short-Term Aging - Phase Ii,
2024
University of Nebraska - Lincoln
Asphalt Binder Laboratory Short-Term Aging - Phase Ii, Farzad Yazdipanah, Ahmad Muhammad, Zahra Kamali Khanghah, Mahdieh Khedmati, Jamilla Teixeira, Mohammad Ghashami, Hamzeh Haghshenas
Nebraska Department of Transportation: Research Reports
This study examined the effectiveness of laboratory short-term aging processes for warm mix asphalt (WMA) binders using response surface methodology (RSM) with various combinations of aging parameters: time, temperature, airflow, and binder weight. The research aimed to enhance understanding of aging parameter efficacy and propose a modified laboratory short-term aging protocol that accurately simulates plant short-term aging in WMA binders. Additionally, the study explored the potential of thermal simulation techniques to model the heat transfer within asphalt mixtures during the compaction procedure. To achieve these goals, three WMA mixtures produced at 135 ºC were collected from plants, and their asphalt …
Analyzing Daytime/Nighttime Pedestrian Crash Patterns In Michigan Using Unsupervised Machine Learning Techniques And Their Potential As A Decision Support Tool,
2024
Western Michigan University
Analyzing Daytime/Nighttime Pedestrian Crash Patterns In Michigan Using Unsupervised Machine Learning Techniques And Their Potential As A Decision Support Tool, Baraah Qawasmeh, Jun-Seok Oh, Valerian Kwigizile
Waldo Library Student Exhibits
No abstract provided.
A Comprehensive Ml And Ai Framework For Intersection Safety: Assessing Contributing Factors, Surrogate Safety Measures, Non-Compliance Behaviors, And Cost-Inclusive Methodology,
2024
Rowan University
A Comprehensive Ml And Ai Framework For Intersection Safety: Assessing Contributing Factors, Surrogate Safety Measures, Non-Compliance Behaviors, And Cost-Inclusive Methodology, Deep Patel
Theses and Dissertations
Intersection safety, particularly in traffic management, has emerged as a pressing concern due to its substantial contribution to road crashes and fatalities. In recent years, understanding road users' behavior and conflicts at intersections has become essential for evaluating traffic safety. According to the Federal Highway Administration (FHWA), in 2020, over 50% of fatal and injury crashes occurred at or near intersections, necessitating further investigation. This study addresses this issue through an innovative blend of comprehensive literature review, advanced machine learning algorithms, artificial intelligence (AI) technologies, surrogate safety measures (SSMs), non-compliance behavior, and emphasizing the economic aspects of traffic incidents. First, …
Evaluation Of Kentucky’S Driver Focus Camera System,
2024
University of Kentucky
Evaluation Of Kentucky’S Driver Focus Camera System, David Leddy, Brian Beaven, Xiaobing Li, Andrew Martin, Jennifer Walton, Chris Van Dyke
Kentucky Transportation Center Research Report
Commercial motor vehicle (CMV) drivers who engage in federally prohibited activities such as not wearing safety belts, using hand-held mobile phones, or texting while driving endanger themselves and imperil the well-being of everyone who occupies the surrounding roadway environment. Unfortunately, conventional CMV inspection routines fail to detect many of these violations because inspectors have difficulty obtaining a clear view of truck cab interiors from inspection facilities. Recognizing it is critical to improve enforcement of Federal Motor Carrier Safety Regulations, this project evaluated the performance of a Driver Focus Camera System (DFCS) at an inspection facility on Interstate 75 northbound in …
Kentucky Traffic Collision Facts Calendar Year 2023 Report,
2024
University of Kentucky
Kentucky Traffic Collision Facts Calendar Year 2023 Report, Paul Ross, Eric Green, Chris Blackden, Kenneth R. Agent, Chris Van Dyke
Kentucky Transportation Center Research Report
No abstract provided.
Analysis Of Traffic Crash Data In Kentucky 2019-2023,
2024
University of Kentucky
Analysis Of Traffic Crash Data In Kentucky 2019-2023, Paul Ross, Eric Green, Chris Blackden, Christopher Van Dyke, Teng Wang, Mohammad Majidi
Kentucky Transportation Center Research Report
No abstract provided.
Effects Of Low-Cycle Fatigue Fracture Of Longitudinal Reinforcing Steel Bars On The Seismic Performance Of Reinforced Concrete Bridge Piers,
2024
California State University, Long Beach
Effects Of Low-Cycle Fatigue Fracture Of Longitudinal Reinforcing Steel Bars On The Seismic Performance Of Reinforced Concrete Bridge Piers, Yu-Fu Ko, Jessica Gonzalez
Mineta Transportation Institute
Earthquakes, which can cause tremendous local stress and strain on infrastructure, can cause reinforced concrete (RC) bridges to collapse due to the concrete cracking and fracture of the steel reinforcement rebars. The fracture of longitudinal reinforcing steel due to low-cycle fatigue is one of the main causes of failure in RC structures under earthquake loading. The purpose of this research is to include the effects of low-cycle fatigue fracture of longitudinal reinforcing steel bars on the seismic performance of reinforced concrete bridge piers. To obtain a greater understanding of low-cycle fatigue failure of steel reinforcement of RC bridge piers subjected …
Design Of An Above Pavement Wireless Sensor Node (Apwsn) For Real-Time Roadway Monitoring Using Piezoelectric Energy-Harvesting,
2024
Rowan University
Design Of An Above Pavement Wireless Sensor Node (Apwsn) For Real-Time Roadway Monitoring Using Piezoelectric Energy-Harvesting, Jochy Jonathan Perez
Theses and Dissertations
The evolution of Smart Highway and Internet of Things (IoT) technologies offers new opportunities to improve the safety and efficiency of vehicular traffic on roads. This research effort describes the development of a wireless pavement sensor that provides a novel method to detect key pavement parameters while incorporating low-power energy harvesting that leverages the kinetic energy generated by vehicular traffic. The Above Pavement Wireless Sensor Node (APWSN) is the embodiment of the approach. APWSN can facilitate the strategic deployment of sensors on a wide variety of roads to enable real-time data collection to support decision-making processes for road infrastructure maintenance …
Unveiling The Risks Of Speeding Behavior By Investigating The Dynamics Of Driver Injury Severity Through Advanced Analytics.,
2024
Rowan University
Unveiling The Risks Of Speeding Behavior By Investigating The Dynamics Of Driver Injury Severity Through Advanced Analytics., Mouyid Islam, Parisa Hosseini, Anahita Kakhani, Mohammad Jalayer, Deep Patel
Henry M. Rowan College of Engineering Departmental Research
Single-vehicle crashes, particularly those caused by speeding, result in a disproportionately high number of fatalities and serious injuries compared to other types of crashes involving passenger vehicles. This study aims to identify factors that contribute to driver injury severity in single-vehicle crashes using machine learning models and advanced econometric models, namely mixed logit with heterogeneity in means and variances. National Crash data from the Crash Report Sampling System (CRSS) managed by the National Highway Traffic Safety Administration (NHTSA) between 2016 and 2018 were utilized for this study. XGBoost and Random Forest models were employed to identify the most influential variables …
Distracted Driving: Identification, Contributing Factors, And Safety Countermeasures,
2024
Rowan University
Distracted Driving: Identification, Contributing Factors, And Safety Countermeasures, Ahmed Sajid Hasan
Theses and Dissertations
Distracted driving is a hazardous behavior responsible for 25% of all fatal traffic crashes in New Jersey. While traditional methods such as surveys, videos, and simulations have been used to identify and evaluate distracted driving events, these approaches primarily provide cross-sectional data that fails to capture the true rate of distraction on the road. This study addresses this limitation by collecting longitudinal data on distracted driving events across selected corridors in New Jersey. A data collection team continuously drove through these corridors, manually counting and video recording driver distraction events. The collected data was then analyzed to assess the significance …
Sustainable Mobility,
2024
California Polytechnic State University, San Luis Obispo
Sustainable Mobility, Shams Tanvir
Mavs Open Press Open Educational Resources - Archive
This textbook and OER material cover tools and basic knowledge required to prepare transportation engineers and planners to contribute towards a carbon-neutral mobility future. The goal of the textbook is to train engineering students on existing tools and policy levers that can be used to incorporate emerging transportation technologies in a sustainable, equitable, and efficient manner.
Fundamentals Of Math, Physics, And Statistics For Future Transportation Professionals,
2024
California Polytechnic State University, San Luis Obispo
Fundamentals Of Math, Physics, And Statistics For Future Transportation Professionals, Anurag Pande, Peyton Ratto, Ahmed Farid
Mavs Open Press Open Educational Resources - Archive
This textbook and OER material cover tools and basic knowledge required to master the prerequisite essentials of physics, mathematics, and statistics applied in transportation engineering. The textbook modules are intended for students with undergraduate degrees in planning and other less technical fields who are interested in pursuing transportation careers where background engineering knowledge is required.
2024 Safety Belt Usage Survey In Kentucky,
2024
University of Kentucky
2024 Safety Belt Usage Survey In Kentucky, Erin Lammers-Staats, Derek Young, Kenneth R. Agent
Kentucky Transportation Center Research Report
No abstract provided.
Spot, Zone And Overcoat Painting Of Steel Bridges,
2024
University of Kentucky
Spot, Zone And Overcoat Painting Of Steel Bridges, Christopher Goff, Sudhir Palle
Kentucky Transportation Center Research Report
Over the past 25 – 30 years, the Kentucky Transportation Cabinet (KYTC) has replaced lead-based coatings on many bridges, often with zinc-based systems. But many of these coating systems are now degrading and reaching the ends of their service lives. Historically, KYTC has relied entirely on remove-and-replace painting, however, given the programmatic costs associated with remove-and-replace painting and constraints imposed by limited funding, the agency needs to explore more economical options, such as spot, zone, and overcoat painting. This report discusses use cases for spot, zone, and overcoat painting and lays out guidelines staff can use to determine what method …
High-Mast Tower Foundation – Phase Ii,
2024
University of Nebraska - Lincoln
High-Mast Tower Foundation – Phase Ii, Ammar Al Maabreh, Abdelrahman Awawdeh, Marc Maguire, Jay Puckett, Brandon Kreiling
Nebraska Department of Transportation: Research Reports
Challenge: High-mast luminaire supports used in the US transportation sector are typically steel poles that are attached to a baseplate via a butt or socket weld. Many have failed primarily due to fatigue cracking at the weld toe. Significant research in the US improved the fatigue performance of these structures; however, failures still occur due to high-cycle cracking at the weld toes, or at other fatigue-prone details. Additionally, poles are failing in moderate winds that create galloping. Galloping is an aerodynamic phenomenon where the wind excitation frequency matches the pole’s natural frequency creating resonance. The top amplitudes are many times …
