检索结果-内蒙古大学图书馆

Experimental study on the effect of stress and water content on resilient modulus of unsaturated subgrade soil: implications for pavement design

引用

Arabian Journal of Geosciences 2025年第4期18卷 1-10页

作者： Amare, Mulugeta Damtew Zoltan, Tompai Asaye, Lemlem Abebaw Mahmood, Yasir Department of Civil Engineering University of North Dakota Grand Forks USA Department of Geotechnics and Engineering Geology Faculty of Civil Engineering Budapest University of Technology and Economics Budapest Hungary Department of Civil Construction and Environmental Engineering North Dakota State University Fargo USA

Subgrade soils possess essential mechanical properties that influence the load-bearing capacity and deformation behavior of pavements. This directly impacts pavement structural performance and longevity. This paper presents the experimental results on determining the factors affecting the resilient modulus (Mr) of a subgrade soil as determined by the triaxial loading machine. A silty sand subgrade soil, tested in its unsaturated form to represent site conditions, was subjected to characterization and cyclic loading tests. The variables considered for this research are deviatoric and constant stress, confining stress, and water content. The Mr is highly dependent on the deviatoric stress, confining pressure, and water content. The shear stress test result at the end of each cyclic loading shows that the soils at the optimum water content level show better shear resistance and elastic deformation below certain stress levels. In contrast, soils in the other moisture levels show complete plastic deformation. Moreover, while confining stress enhances Mr, deviatoric stress reduces it.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Slope deformation partitioning and monitoring points optimization based on cluster analysis

引用

Journal of Mountain Science 2023年第8期20卷 2405-2421页

作者： LI Yuan-zheng SHEN Jun-hui ZHANG Wei-xin ZHANG Kai-qiang PENG Zhang-hai HUANG Meng State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009China Inner Mongolia First Machinery Group Co. LtdBaotou 014030China School of Civil Engineering Chongqing UniversityChongqing 400045China China Communications Construction Fourth Harbor Engineering Institute Co. LtdGuangzhou 510230China

The scientific and fair positioning of monitoring locations for surface displacement on slopes is a prerequisite for early warning and ***,there is no specific provision on how to effectively determine the number and location of monitoring points according to the actual deformation characteristics of the *** are still some defects in the layout of monitoring *** this end,based on displacement data series and spatial location information of surface displacement monitoring points,by combining displacement series correlation and spatial distance influence factors,a spatial deformation correlation calculation model of slope based on clustering analysis was proposed to calculate the correlation between different monitoring points,based on which the deformation area of the slope was *** redundant monitoring points in each partition were eliminated based on the partition's outcome,and the overall optimal arrangement of slope monitoring points was then *** method scientifically addresses the issues of slope deformation zoning and data gathering *** not only eliminates human subjectivity from slope deformation zoning but also increases the efficiency and accuracy of slope *** order to verify the effectiveness of the method,a sand-mudstone interbedded CounterTilt excavation slope in the Chongqing city of China was used as the research ***-four monitoring points deployed on this slope were monitored for surface displacement for 13 *** spatial location of the monitoring points was *** results show that the proposed method of slope deformation zoning and the optimized placement of monitoring points are feasible.

关键词： Excavation slope Surface displacement monitoring Spatial deformation analysis Clustering analysis Slope deformation partitioning Monitoring point optimization

来源：评论

学校读者我要写书评

暂无评论

Economic Conditions of Leaving the construction Site by the Contractor at Different Stages of its Implementation 5th

Economic Conditions of Leaving the Construction Site by the ...

引用

5th International Scientific Conference on Environmental Challenges in civil engineering, ECCE 2022

作者： Przywara, Daniel Rak, Adam Department of Bridges Faculty of Civil Engineering and Architecture Geotechnics and Construction Processes Opole University of Technology Katowicka 48 Opole45-061 Poland

ISBN: (纸本)9783031268786

The article attempts to carry out a detailed economic analysis resulting from the interruption of works executed on the basis of the agreed work schedule. The event of the contract breach by the contractor may result from the identified underestimation of the works at the stage of their valuation, or from diagnosed delays in implementation, not allowing for their timely completion. The decision to discontinue the works is usually preceded by an analysis of the costs necessary to incur, generated by contractual penalties for failure to perform the contract. The comparison of the costs of contractual penalties with the actual expenses for the implementation of the project should also include the actual delay of works, as it generates additional financial losses. The economic analysis of the contractor's leaving the construction site was carried out using the tools of the Earned Value Method (EVM), using its simple and complex indexes. The case study concerns the assessment of costs and the actual pace of works implementation on the construction site – at various stages of their implementation according to the agreed schedule. The aim of the analysis is an attempt to identify the level of production executed on the construction site, at which its non-profitability takes precedence over the non-profitability of the contract, from the contractor's point of view. The economic analysis uses an example of a completed construction project involving the construction of a three-segment multi-family residential development in Opole (Poland). © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Contractors

来源：评论

学校读者我要写书评

暂无评论

Numerical Modeling of the Dynamic Response of an Elastoplastic Seabed Under Wave-Current Interactions

引用

Journal of Ocean University of China 2023年第1期22卷 43-52页

作者： SHAN Zhigang ZHU Zhipeng WANG Dong YE Guanlin Zhejiang Huadong Construction Engineering Corporation Limited Hangzhou 310014China MOE Key Laboratory of Marine Environment and Ecology Ocean University of ChinaQingdao 266100China Laboratory of Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Department of Civil Engineering and State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Wave-induced liquefaction of the seabed is a geohazard frequently encountered in shallow *** widely discussed,most studies paid attention to the seabed response under a single sequence of wave ***,the seabed suffers from repeated‘wave loading–dissipation’phases in a real ocean *** this study,a homogeneous sandy seabed model is established to investigate the mechanism of wave-induced liquefaction by considering the existence of *** element analyses are conducted by incorporating a kinematic hardening elastoplastic model into the commercial package *** constitutive model is validated against centrifugal wave *** studies are conducted to demonstrate the effects of relative densities,current,and wave-loading history on the seabed *** predicted excess pore pressure,effective stress paths,and associated variation of relative density are discussed in *** results show that the densification of soils significantly enhances the resistance against liquefaction,which provides new insight into the mechanism of residual liquefaction during wave sequences.

关键词： seabed liquefaction wave current finite element methods cyclic loading

来源：评论

学校读者我要写书评

暂无评论

Research Analysis on the Microscopic Properties and Damping Performance of Carbon Nanomaterial-Modified Cement Mortar

引用

engineering（科研） 2024年第9期16卷 275-283页

作者： Bin Liu Norhaiza Nordin Jiyang Wang Jingwei Wu Xiuliang Liu Department of Construction Engineering Zhejiang College of Construction Hangzhou China Faculty of Engineering Science and Technology Infrastructure University Kuala Lumpur Selangor Malaysia College of Civil Engineering and Architecture Zhejiang University Hangzhou China

The application of carbon nanomaterials, particularly graphene and carbon nanotubes, in cement-based composites is highly significant. These materials demonstrate the multifunctionality of carbon and offer extensive possibilities for technological advancements. This research analyzes how the integration of graphene into cement-based composites enhances damping and mechanical properties, thereby contributing to the safety and durability of structures. Research on carbon nanomaterials is ongoing and is expected to continue driving innovation across various industrial sectors, promoting the sustainable development of building materials.

关键词： Carbon Nanomaterials Cement-Based Composites Microscopic Properties Damping Properties Modified Cement Mortar

来源：评论

学校读者我要写书评

暂无评论

Challenges to Effective Material Management Practices on construction Project

Challenges to Effective Material Management Practices on Con...

引用

International Conference of Sustainable Development and Smart Built Environments, SDSBE 2024

作者： Aregbesola, Tunde Adekunle, Samuel Aigbavboa, Clinton Construction Management and Quantity Surveying Department University of Johannesburg Johannesburg South Africa Department of Civil Engineering College of Engineering and Technology William V.S. Tubman University East Harper Maryland County Liberia

ISBN: (纸本)9789819640508

A critical aspect often overlooked in achieving construction project success is the management of materials on construction sites. Poor material inventory and procurement handling, among others, severely impact the project's success. This study explores the challenges of material management on construction project performance. A quantitative approach was adopted to achieve this, and a well-structured questionnaire was distributed to construction industry professionals. A total of 70 data sets were considered for analysis after data collection. The results identified and ranked the challenges under seven headings: ‘Material Schedule’, ‘Material Scheduling’, ‘Material Control’, ‘Material Handling’, ‘Material Storage’ and ‘Material Wastages’. construction project success is heavily dependent on the efficient management of materials and the lack of appropriate material management can adversely impact successful project delivery. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Project management

来源：评论

学校读者我要写书评

暂无评论

Towards Sustainable Transport: An Analysis of Urban Mobility in Hyderabad, Telangana Using Uber Movement Data

引用

Periodica Polytechnica Transportation engineering 2025年第2期53卷 158-168页

作者： Kuchu, Jayasree Tatipamula, Srinivas Ankam, Chandrakanth Birukuri, Navyashanthi Department of Civil Engineering Vasavi College of Engineering Ibrahimbagh Telangana Hyderabad500031 India Spectrum Techno Consultants Pvt. Ltd. BSEL Tech Park Sector 30A Vashi Maharashtra Navi Mumbai400703 India DAZN Software Private Ltd. Telangana Hyderabad500081 India Construction Technology and Management National Institute of Technology Karnataka Surathkal Surathkal Mangalore Karnataka 575025 India

Cities worldwide face traffic congestion, challenging sustainable development and requiring insight into its dynamics, dispersion, and stability. Effective traffic management is pivotal for fostering sustainable urban mobility and enhancing quality of life. Leveraging Uber movement data, this study examines travel times and speeds across Hyderabad over a four-year span from 2016 to 2019. Congestion and friction indices from travel time matrices, along with network analysis, gauge urban accessibility, revealing similar magnitudes of Congestion and Travel Time Delay Transition Indices for inbound and outbound traffic within specific intervals. Notably, there is an inverse proportional relationship between these two indices. The Congestion Index values indicate that most zones experience significant traffic jams, while the Travel Time Delay Transition Index was calculated to affirm its inverse relationship with the Congestion Index. Employing fractal geometry, the study delves into the spatial complexity of the network and its correlation with urban growth parameters, contributing to sustainable urban planning efforts. Furthermore, the fractal dimension value obtained from the Mass-Radius method is 1.6955, with a correlation coefficient of 0.99, indicating a high degree of linearity between the road network and friction index. Results underscore the intricate interplay between traffic congestion, macroeconomic factors, and urban form, highlighting the imperative of integrating sustainability principles into transportation policies. By leveraging readily available Uber movement data, this research provides a comprehensive assessment of citywide traffic conditions, offering valuable insights for crafting sustainable transportation management strategies aimed at mitigating congestion and promoting equitable access to mobility. © 2025 Budapest University of technology and Economics. All rights reserved.

关键词： Traffic congestion

来源：评论

学校读者我要写书评

暂无评论

construction Duration Forecasting Based on Machine Learning Method

Construction Duration Forecasting Based on Machine Learning ...

引用

2023 International Conference on construction and Real Estate Management: The Human-Centered construction Transformation, ICCREM 2023

作者： Jiang, Xinmei Li, Baoshan Fang, Yuan Liu, Feng Zhao, Gexiao Dept. of Civil and Transportation Engineering Guangdong Univ. of Technology Guangdong China Construction Engineering Standard Quota Station of Guangdong Province Guangdong China Guangdong Jiandong Engineering Supervision Co. Guangdong China

ISBN: (数字)9780784485217

ISBN: (纸本)9780784485217

With the continuous development of the world economy, many advanced technologies are attempted to be used in the construction practice. It requires high level of management method during the construction process. However, there is still a phenomenon that some construction plans, such as construction duration is predicted according to personal experience. Accurate and scientific prediction methods are lack. As one of the important factors for the construction project, the construction duration is of great significance to the cost control of the whole project. It directly affects the recovery of the contractors' economic profit. In order to accurately predict the construction duration, this paper discusses the main factors affecting the construction duration A machine learning model is built for the construction duration prediction and the affecting factors are inputted as parameters to the model. The data from about 30 construction projects are used for the model training. The importance of the affecting factors is found. The machine learning based method for construction duration forecasting offer a dependent reference for the construction managers when making construction plan. © ASCE.

关键词： Forecasting

来源：评论

学校读者我要写书评

暂无评论

The Influence of Carbon Nanotubes and Nano-Silica Fume on Enhancing the Damping and Mechanical Properties of Cement-Based Materials

引用

Materials Sciences and Applications 2024年第9期15卷 399-416页

作者： Bin Liu Norhaiza Nordin Jiyang Wang Jingwei Wu Xiuliang Liu Department of Construction Engineering Zhejiang College of Construction Hangzhou China Faculty of Engineering Science and Technology Infrastructure University Kuala Lumpur Kajang Malaysia College of Civil Engineering and Architecture Zhejiang University Hangzhou China

This paper conducted experimental studies on the damping and mechanical properties of carbon nanotube-nanosilica-cement composite materials with different carbon nanotube contents. The damping and mechanical properties enhancement mechanisms were analyzed and compared through the porosity structure test, XRD analysis, and scanning electron microscope observation. The results show that the introduction of nanosilica significantly improves the dispersion of carbon nanotubes in the cement matrix. At the same time, the addition of nanosilica not only effectively reduces the critical pore size and average pore size of the cement composite material, but also exhibits good synergistic effects with carbon nanotubes, which can significantly optimize the pore structure. Finally, a rationalization suggestion for the co-doping of nanosilica and carbon nanotubes was given to achieve a significant increase in the flexural strength, compressive strength and loss factor of cement-based materials.

关键词： Cement-based Composites Carbon Nanotubes Nano Silica Fume Damping Property Mechanical Property

来源：评论

学校读者我要写书评

暂无评论

Drone-based acquisition of as-built models for the automation of processes within the digital management of bridge assets 8th

Drone-based acquisition of as-built models for the automatio...

引用

8th International Symposium on Reliability engineering and Risk Management, ISRERM 2022

作者： Kaufmann, F. Tschickardt, T. Glock, C. Department of Civil Engineering Institute of Concrete Structures and Structural Design TU Kaiserslautern - University of Technology Germany Digital Construction Manager Wayss and Freytag Ingenieurbau AG Corporate Development and Process Management Germany Concrete and Masonry Structures Department of Civil Engineering Institute of Concrete Structures and Structural Design TU Kaiserslautern - University of Technology Germany

ISBN: (纸本)9789811851841

Particularly in the execution and operation phase, little research has been done on how data and information can be automatically acquired and integrated into building information models (BIMs). The presented approach thus includes autonomous data acquisition with UAVs (unmanned aerial vehicle), semantic information extraction and an update of existing BIMs. All steps shall be automated to enable real-time information delivery in short cycles. Based on the 4D-Monitoring-BIM (4D-MBIM), relevant components are identified and waypoints for the drone-based data acquisition are derived. Subsequently, the UAV mission is planned based on the 4DMBIM, considering the data acquisition technology, possible obstacles and other boundary conditions. The UAV mission and quality of acquired data is evaluated within a full simulation of the data acquisition mission. The data acquisition is carried out by means of autonomously operating UAVs. Within the acquired point clouds, a semantic segmentation using Machine Learning methods is performed to detect objects. Per object class, single objects are clustered and subsequently (i) a full BIM reconstruction, (ii) BIM to scan comparison and (iii) further information extraction e.g., concrete crack and spalling detection, is performed. All information will be represented according to the BIM methodology using open standards. © 2022 ISRERM Organizers. Published by Research Publishing, Singapore.

关键词： Drones

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：