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A study on bus user's perception in selected Indian cities

Materials Today: Proceedings 2022年 65卷 3177-3184页

作者： Chepuri, Akhilesh Prasad Elluri, Venkata Kumar Reddy Bijivemula, Sudheer Department of Civil Engineering GITAM School of Technology Hyderabad 502329 India Department of Construction Technology and Mangaement Dr. YSR Architecture and Fine Arts University Kadapa 516162 India

This study aims at understanding the perception of city bus users in selected Indian cities under given operating conditions. A questionnaire form was designed for capturing the socio-economic characteristics, trip characteristics, satisfaction, and preferences of the bus users. This questionnaire includes seven service quality attributes namely in-vehicle travel time, bus stop waiting time, bus on-time performance, riding comfort, safety, end-to-end connectivity, providing reliable information on the bus stops, and providing reliable information on the smartphone. Personal Interview Surveys were conducted to collect the responses from the city bus users. Total 613 samples were considered for analysis in Hyderabad, 707 samples in Navi Mumbai and 590 samples from Surat BRTS users, 505 samples from Surat city bus users. Further, Garret ranking technique was also employed to analyze the priority preferences based on the sample's responses. Based on Garret's weightages, weighted average satisfaction ratings were evaluated. Based on the results, it was found that females have given more priority for safety attributes. Bus on-time performance, bus reliability, bus stop waiting time and on time performance were given the highest priority and reliable information at bus stops and online sources were given the least priority. © 2022

关键词： Quality of service

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Prediction of lining response for twin tunnels constructed in anisotropic clay using machine learning techniques

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Underground Space 2022年第1期7卷 122-133页

作者： Wengang Zhang Yongqin Li Chongzhi Wu Hongrui Li ATC Goh Hanlong Liu School of Civil Engineering Chongqing UniversityChongqing 400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore

Excessive structural forces generated inside tunnel linings could affect the safety and serviceability of tunnels,emphasizing the need to accurately predict the forces acting on tunnel linings during the preliminary design *** this study,an anisotropic soil model devel-oped by Norwegian Geotechnical Institute(NGI)based on the Active-Direct shear-Passive concept(NGI-ADP model)was adopted to conduct finite element(FE)analyses.A total of 682 cases were modeled to analyze the effects of five key parameters on twin-tunnel struc-tural forces;these parameters included twin-tunnel arrangements and subsurface soil properties:burial depth H,tunnel center-to-center distance D,soil strength s_(u)^(A),stiffness ratio G_(u)=s_(u)^(A),and degree of anisotropy ss_(u)^(P)=s_(u)^(A).The significant factors contributing to the bending moment and thrust force of the linings were the tunnel distance and overlying soil depth,*** degree of anisotropy of the surrounding soil was found to be extremely important in simulating the twin-tunnel construction,and severe design errors could be made if the soil anisotropy is ignored.A cutting-edge application of machine learning in the construction of twin tunnels is presented;multivariate adaptive regression splines and decision tree regressor methods are developed to predict the maximum bending moment within the first tunnel’s linings based on the constructed FE *** developed prediction model can enable engineers to estimate the structural response of twin tunnels more accurately in order to meet the specific target reliability indices of projects.

关键词： Twin tunnel Bending moment Thrust force Multivariate adaptive regression splines Decision tree regressor

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Numerical verification for a cable tension estimation method simply based on local vibration measurements 11

Numerical verification for a cable tension estimation method...

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11th International Conference on Structural Health Monitoring of Intelligent Infrastructure, SHMII 2022

作者： Wu, Wen-Hwa Chen, Chien-Chou Liu, Yan-Ting Lai, Gwolong Department of Civil and Construction Engineering National Yunlin University of Science and Technology Yunlin640 Taiwan

To apply the tension estimation method based on effective vibration lengths, it has been clarified that the installation of at least one sensor near the high end of a stay cable or a suspender of arch bridge is necessary for attaining good accuracy. Efforts are made in this research to release such an undesirable requirement that may greatly hinder popular applications of this method. Re-examination of formulations first reveals that the half-wavelength, rather than the whole effective vibration length, of each considered mode is actually needed in the mode shape based method. Therefore, cable tension estimation simply using local vibration measurements to fit partial mode shapes is a viable alternative as long as the accuracy in determining the half-wavelengths of all the chosen modes can be ensured. Numerical analyses with the finite element models for two stay cables are then conducted to investigate the appropriate covering range of local measurements and the preferred choice of modes. © 2022 International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII. All rights reserved.

关键词： Vibration measurement

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An optimization model for synchronous road geometric and pavement enhancements

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Journal of Traffic and Transportation engineering(English Edition) 2021年第3期8卷 421-438页

作者： Mohammad Mahanpoor Saeed Monajjem Vahid Balali Department of Civil Engineering K.N.Toosi University of TechnologyTehranIran Department of Civil Engineering and Construction Engineering Management California State UniversityLong BeachCA 90840USA

A synchronous optimization model for rehabilitation of existing two-way two-lane(TWTL)highways is proposed in this paper considering geometric modification and existing pavement rehabilitation. The rehabilitation process of existing roadways is categorized into geometric design modifications and pavement repairs. These two types of modification apply separately in roadway life-cycle because of the difference in nature of these repairs, which impose an extra cost and time of closure to road users and owners. This paper aims to address the modification of existing highways by a new approach linking the existing pavement condition and geometric configuration changes of the developed roadway to provide the optimum vertical alignment. The proposed procedure depends on various parameters of existing pavement condition, cross-section configuration, traffic volume and composition, and current alignment composure. In the first step, all these dependencies are explained and quantified with separate cost models. For each solution,the overall cost is calculated with a life-cycle cost analysis approach. Finally, a particle swarm optimization(PSO) based model is developed to find the optimum solution. The developed model was applied in two case studies with good and adverse geometric conditions. The results show that there is a critical condition in the roadway segments which have all these conditions:(1) the grade is more than three percent,(2) the grade is following with reverse grade, and(3) decommissioning of the asphalt concrete(or extended to lower layers) exist. The optimum solution in these critical conditions suggests the modification of the geometric configuration before the pavement rehabilitation in order to reduce the overall cost. In the absence of these conditions, the optimum alignment is more analogous with the existing alignment of the highway.

关键词： Transportation engineering Geometric modification Pavement rehabilitation Optimization Sustainability Safety

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GHG emission quantification and reduction pathway of subway shield tunnel engineering: a case study on Guangzhou Metro, China

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Environmental Science and Pollution Research 2024年第42期31卷 54768-54784页

作者： Wu, Huanyu Yang, Kehua Chen, Kunyang Zhou, Wenwen Yu, Tao Wang, Kai College of Civil and Transportation Engineering Shenzhen University Shenzhen518060 China Sino-Australia Joint Research Center in BIM and Smart Construction Shenzhen University Shenzhen518061 China National Key Laboratory for Intelligent Construction and Maintenance of Extreme Environment Geotechnical and Tunnel Engineering Shenzhen518061 China Shenzhen Key Laboratory of Green Efficient and Intelligent Construction of Underground Subway Station Shenzhen China Shenzhen TH SWARE Technology Co. Shenzhen518057 China Shaanxi Railway Institute Shanxi Weinan714000 China

The shield method is a commonly used construction technique in subway tunnel engineering. However, studies on greenhouse gas (GHG) emissions specifically in subway shield tunnel engineering are lacking. This study aims to investigate the GHG emission characteristics and GHG reduction pathways during the construction period of subway shield tunnels. Firstly, based on the life cycle assessment (LCA) method, a greenhouse gas (GHG) emission quantification model for the shield tunnel construction period was developed using a multi-level decomposition of construction. Then, the GHG emission level and intensity during the construction period of a case project are quantified, and its emission characteristics and GHG reduction potential points are assessed. Finally, a comprehensive path for GHG reduction in subway shield tunnel engineering is proposed. The research results indicate that constructing 1 km of subway shield tunnel can generate 19,294.28 t CO2eq. Among these, material production element dominates the emissions with a percentage of 89.05%, while transportation and mechanical construction elements contribute 1.81% and 9.14%, respectively. From the structure perspective, the main structure contributes 88.73% of total emissions, while the ancillary structure contributes 11.27%. Among them, the working shaft and tunnel segments are the main sources of emissions for the main structure, accounting for 23.65% and 65.08%, respectively. Connecting channel and end reinforcement are the main emission sources of the ancillary structures, accounting for 43.63% and 31.30%, respectively. These findings provide a scientific foundation for the environmentally friendly transformation of urban railway development regarding pursuing "carbon peaking and carbon neutrality" strategic goals. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Greenhouse gas emissions

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Risk Evaluation and Countermeasures for Shallow Overburden Box Culvert Jacking construction Based on AHP-emergent Level Model 11

Risk Evaluation and Countermeasures for Shallow Overburden B...

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11th International Symposium on Project Management, ISPM 2023

作者： Zhang, Tianbao Chen, Yong Chang, Junsong Su, Xiaobo Liu, Kaiyang CCTEB Infrastructure Construction Investment Co. Ltd. Wuhan430073 China School of Civil and Resource Engineering University of Science and Technology Beijing100083 China Department of Civil Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9781713877134

In order to manage the shallow overburden box culvert jacking construction efficiently and dynamically, taking the municipal project box culvert jacking construction as an example, proposed the construction method of reducing resistance slip and shallow overburden box culvert jacking construction risk mechanism analysis, and build a risk evaluation system. Combined with analytic hierarchy process and catastrophe theory, a comprehensive evaluation model of catastrophe series in box culvert jacking construction process is constructed, and the dynamic risk prediction of the construction process is carried out.. It is found that: (1) the risk level of the five construction processes of jacking 9m, 18m, 27m, 36m and 44m are all "Grade I", among which the risk of the process of jacking 27m is relatively the largest and the risk of the process of jacking 9m is relatively the smallest, which keeps good consistency with the actual;(2) after the application on the construction site, the construction method of reduced resistance sliding can better control the road settlement and save the construction period, and ensure the safety of shallow overburden box culvert jacking construction. © (2023) by Aussino Academic Publishing House All rights reserved.

关键词： Risk assessment

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A method for support stiffness failure identification in a steel spring floating slab track of urban railway: a case study in China

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2024年第3期25卷 206-222页

作者： Junyuan ZHENG Caiyou ZHAO Duojia SHI Ping WANG Jian WANG Bolong JIANG Xi SHENG Key Laboratoryof High-speed Railway Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 60031China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China 01 DYNA(Qingdao)Test&Data Co. Ltd.Qingdao 266000China Rail Transit Digital Construction and Measurement Technology National Engineering Research Center China Railway Design CorporationTianjin300308China Institute of Urban Smart Transportation&Safety Maintenance Shenzhen UniversityShenzhen 518060China

The extensive use of steel spring floating slab tracks has effectively addressed the challenge of alleviating the environmental vibrations induced by urban rail transit ***,under the combined action of train dynamic loads and complex environmental factors,problems,such as the fracture of steel spring vibration isolators and suspension vibrations induced by the uneven settlement of the base,often *** failure of isolator support stiffness is often hidden in its early stages and is challenging to identify by conventional detection *** the same time,it will aggravate the wheel-rail interaction,accelerate the deterioration of track structure,and even affect the driving *** study first establishes a detailed coupled train-floating slab track-foundation analytical *** the influence of the vibration isolator support stiffness failure on the dynamic indices of the floating slab track system response is analyzed.A set of defect identification methods that can detect the number of failed steel springs,severity of damage,and their location is ***,an intelligent monitoring system for support stiffness of floating slab track is built by combining the density-based spatial clustering of applications with noise algorithm and statistical data analysis and is applied to a rail line in southern *** a three-year monitoring campaign,a suspension failure and a fracture of a steel spring were each successfully detected and detailed failure information was *** investigation results were consistent with the damage identification *** repair,the track structure dynamic response returned to the average pre-damage level and further deterioration had been *** proposed damage identification methods and monitoring system provide an approach for intelligent identification of track structure support stiffness failures.

关键词： Floating slab track Support stiffness Detailed analytical model Failure identification Monitoring system

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Experimental research and energy analysis of a new type of dry ice powder pneumatic rock breaking technology

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International Journal of Mining Science and technology 2023年第4期33卷 423-435页

作者： Xiaofei Wang Shaobin Hu Enyuan Wang Qiang Zhang Bing Liu Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology)Ministry of Education Xuzhou 221116China National Engineering Research Center for Coal Gas Control China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering HoHai UniversityNanjing 210098China Tunnel and Underground Engineering Institute College of Civil and Transportation EngineeringHoHai UniversityNanjing 210098China China Electric Construction East China Survey and Design Institute Hangzhou 311122China

When the traditional drill and blast method is applied to rock crushing projects,it has strong vibration,loud noise and dust pollution,so it cannot be used in densely populated areas such as urban public *** developed a supercritical CO_(2)true triaxial pneumatic rock-breaking experimental system,and conducted laboratory and field tests of dry ice powder pneumatic *** characteristics of the blast-induced vibration velocity waveform and the evolution of the vibration velocity and frequency with the focal distance were analyzed and *** fracturing mechanism of dry ice powder pneumatic rock breaking is *** research results show that:(1)The vibration velocity induced by dry ice powder pneumatic rock breaking decays as a power function with the increase of the focal distance;(2)The vibration frequency caused by dry ice powder pneumatic rock breaking is mainly distributed in 1–120 *** to the dispersion effect,the dominant frequency of 10–30 Hz appears abnormally attenuated;(3)The traditional CO_(2)phase change fracturing energy calculation formula is also applicable to dry ice pneumatic rock breaking technology,and the trinitrotoluene(TNT)equivalent of fracturing energy is applicable to the Sadovsky formula;(4)Dry ice powder pneumatic rock breaking is shock wave and highenergy gas acting together to fracture rock,which can be divided into three stages,among which the gas wedge action of high-energy gas plays a dominant role in rock mass damage.

关键词： Dry ice powder pneumatic rock breaking Cracking mechanism Energy analysis Vibration frequency

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Analysing the critical delay factors and delay in material supply for construction projects in India

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Materials Today: Proceedings 2022年 60卷 1890-1897页

作者： Vidyasagar Reddy, M. Rao, Hanumantha Construction Technology and Management Koneru Lakshmaiah Education Foundation AP Vaddeswaram India Department of Civil Engineering Koneru Lakshmaiah Education Foundation AP Vaddeswaram India

The study of construction delays has remained the subject of much research, and the construction sector in India is nevertheless beset by reoccurring issues. As a consequence of delineating the most prevalent sources of construction project delays and the core elements that influence to delays, this research provides to the theory and practice of construction scheduling. Because the Indian construction sector's hade tremendous growth in efficiency and quantity over the previous generation, a thorough examination of the reasons of delays and the formation of a common comprehension with industry professionals are vital. The literature research identified 47 distinct reasons of delay;the 25 most commonly reported are grouped as client, contractor, consultant, labour and machinery, inventory, and other associated categories. The opinions of 142 construction experts from client, consultant, and contractor organizations were gathered through a survey. These factors are prioritized using a weighted relevance score that considers both frequency and severity, with the top five being Contractors' financial difficulties. Inadequate planning and scheduling on the part of the entrepreneur, non-payment of invoices or a failure to collect payment for completed work Incompetent site administration and oversight, a high volume of client-requested changes. These findings are significant for reflective practice in the planning and control of building activities. The study's findings will assist the Indian construction community in revising delay causes and realigning project management practices to guarantee projects are completed on schedule. © 2022

关键词： Contractors

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Risk Assessment Models for Pipeline Infrastructure Failure

Risk Assessment Models for Pipeline Infrastructure Failure

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ASCE Inspire 2023: Infrastructure Innovation and Adaptation for a Sustainable and Resilient World

作者： Zhang, Xiaoyue Duan, Junyi Tao, Chengcheng Huang, Ying School of Construction Management Technology Purdue Univ. West LafayetteIN United States Dept. of Civil Construction and Environmental Engineering North Dakota State Univ. United States

ISBN: (纸本)9780784485163

Pipeline failures caused by aging, corrosion, and damage may result in irreparable societal, economic, and environmental consequences. Therefore, pipeline safety and integrity are crucial to the robustness of modern societies. However, current pipeline risk analysis and management have some limitations in predicting pipeline holistic failure for integrity management. In this paper, we develop a machine learning-based risk model to predict the failure type of pipelines. We train and test the risk models based on the historical data from a report covering 50 years of spillage data in Europe. Various factors, such as pipeline diameter, age, pipeline location, and land use, are considered in the models. We propose nine risk models and apply the support vector machine (SVM) approach to obtain the best model type with the highest prediction accuracy. The best risk model will provide pipeline operators with an efficient and effective way to evaluate pipeline conditions and guide pipeline rehabilitation and maintenance procedures. © 2023 by the American Society of civil Engineers. All Rights Reserved.

关键词： Pipelines

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