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Stability Charts for Fill Slopes Based on Finite Element Limit Analysis Methods

Soil Mechanics and Foundation engineering 2023年第4期60卷 340-347页

作者： Li, A.J. Lim, K. Hsiung, B.-C. Benson Chen, W.C. Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei Taiwan NSW & ACT Transport & Resources Department Arup Sydney Australia Department of Civil Engineering National Chung-Hsing University Taichung Taiwan Department of Civil and Environmental Engineering National University of Kaohsiung Kaohsiung Taiwan

Slope stability assessment is extremely important in geotechnical engineering, as it prevents slope failures and the loss of lives. This paper utilizes the finite element lower bound limit analysis method to investigate and develop a set of 3D stability charts for fill slopes where frictional fill materials are placed on undrained clay with increasing shear strength with depth. Based on the stability charts, preliminary slope designs can be performed with convenience and ease, which is advantageous during the preliminary design stage when options and cost-saving solutions are more important than detailed design. Additionally, for comparison purposes, the results from twodimensional analyses are also presented and discussed. This study shows that the ratio of F3D/F2D is always larger than unity. Discussions on the factors affecting the failure mechanisms of this type of slope are also presented. In particular, a better understanding of such failure mechanisms allows engineers to better predict the footprints and consequences of the failures of such slopes. © 2023, Springer Science+Business Media, LLC, part of Springer Nature.

关键词： Slope stability

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Properties and printability evaluation of three-dimensional printing magnesium oxychloride cement by fully utilizing aeolian sand

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Frontiers of Structural and civil engineering 2023年第11期17卷 1675-1689页

作者： Qinghua WANG Jinggang XU Duo FENG Wei LI Yuanyuan ZHOU Qiao WANG School of Civil and Transportation Engineering Hebei University of TechnologyTianjin 300401China Hebei Investigation Design&Research Institute of Water Conservancy&Hydropower Tianjin 300240China Engineering Research Center on Construction 3D Printing of Hebei Tianjin 300401China

Three-dimensional concrete printing(3DCP)is increasingly being applied in harsh environments and isolated ***,the effective utilization of aeolian sand(AS)resources and by-products derived from arid zones for 3DCP is yet to be fully *** study developed a three-dimensional(3D)printing composite using AS and magnesium oxychloride cement(MOC)from local *** effects of the mole ratio of MgO/MgCl_(2)and sand/binder(S/B)ratio on the mechanical properties such as water resistance,drying shrinkage strain,rheology,and printability,were investigated *** results indicated that the optimal mole ratio of MgO/MgCl_(2),was 8,which yielded the desired mechanical performance and water ***,the S/B ratio can be increased to three within the desired printability to increase the AS utilization *** rheological recovery and buildability of the 3D-printed MOC with AS were *** findings provide a promising strategy for construction in remote deserts.

关键词： 3DCP AS magnesium oxychloride cement mechanical behavior drying shrinkage rheological property

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Self-healing performance of normal strength concrete with Bacillus subtilis bacteria

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Journal of Building Pathology and Rehabilitation 2024年第1期9卷 1-13页

作者： Zamba, Duresa Dubale Mohammed, Tesfaye Alemu Department of Civil Engineering Addis Ababa Science and Technology University Addis Ababa Ethiopia Construction Quality and Technology Center of Excellence Addis Ababa Science and Technology University Addis Ababa Ethiopia

The use of bacteria to improve the mechanical and durability properties of concrete was investigated in this study. B. subtilis bacteria were incorporated into normal strength concrete at a concentration of 10⁸ cells/ml. A total of 66 concrete specimens were cast and tested for mechanical and durability properties (compressive strength, flexural strength, UPV, water absorption, acid resistance, and salt resistance) at 7, 14, 28, and 56 days. Cracked specimens were also examined using 3D optical microscope until cracks were healed. The results showed that the addition of bacteria to concrete significantly improved its mechanical and durability properties. The compressive, flexural, and UPV values of concrete with bacteria increased to 19.55%, 15.25%, and 5.40%, respectively, compared to the control group at 28 days of curing. At 56 days of curing, the acid and salt resistance of concrete with bacteria increased to 11.38% and 18.78%, respectively. Examination of the cracks in the bacterial concrete using a 3D optical microscope revealed a large white crystalline deposit was formed that almost filled the surface of the crack. This is due to the B. subtilis bacteria producing calcite precipitation, which fills concrete cracks. Overall, the results of this study showed that the use of B. subtilis bacteria can significantly improve the mechanical and durability properties of concrete. This makes bacterial concrete a promising material for use in a variety of applications, such as infrastructure, construction, and civil engineering. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Bacterial concrete Calcite precipitation Durability properties Mechanical properties Self-healing

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非对称弦测法中基于梯度下降的轨道不平顺复原方法

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Journal of Central South University 2024年第1期31卷 288-301页

作者：曾晨国巍刘汉云余志武蒋丽忠国振谈遂 School of Civil Engineering Central South UniversityChangsha 410075China National Engineering Research Center of High-speed Railway Construction Technology Changsha 410075China School of Civil Engineering Changsha University of Science&TechnologyChangsha 410114China School of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310058China

本研究提出了一种基于梯度下降的轨道不平顺复原方法。基于非对称弦测法理论,轨道不平顺的复原过程可描述为一个欠定线性系统的优化问题。本文提出采用梯度下降法求解该优化问题,采用了考虑正则项的二次型代价函数。为了评估所提出方法... 详细信息

本研究提出了一种基于梯度下降的轨道不平顺复原方法。基于非对称弦测法理论,轨道不平顺的复原过程可描述为一个欠定线性系统的优化问题。本文提出采用梯度下降法求解该优化问题,采用了考虑正则项的二次型代价函数。为了评估所提出方法的性能,本研究搭建了一个轨道检测小车,并在一个缩尺桥梁模型上进行了现场试验。通过与水准仪测量值的比较,验证了基于梯度下降轨道不平顺复原方法具有良好精度。与传统的需要专门设计逆滤波器的轨道不平顺复原方法相比,本研究所提出的方法物理意义明确,只需基于非对称弦测法原理建立优化模型,这表明本方法在现场实测中具有良好的可操作性。此外,重复性评估表明,在调整不同的弦长以及多次重复测量时,本研究所提出的方法可复现一致的轨道不平顺结果,表明该方法具有良好的测量重复性。本研究所提出的方法可对轨道不平顺进行准确复原,为轨道平顺性状态及时有效评估提供数据支撑,进而保证列车运行的平稳与安全。

关键词：非对称弦测法轨道不平顺复原优化模型梯度下降方法逆滤波器法

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Determination of groundwater buoyancy reduction coefficient in clay:Model tests,numerical simulations and machine learning methods

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Underground Space 2023年第6期13卷 228-240页

作者： Weixin Sun Hanlong liu Wengang Zhang Songlin liu Liang Han School of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing 400045China

Groundwater plays an essential role in stabilizing underground ***,hydrostatic uplift forces from groundwater can create safety *** paper obtained the groundwater buoyancy reduction coefficients of 36 types of clays through model tests and conducted a finite element simulation to obtain the buoyancy reduction coefficients of additional clays with varying soil *** learning methods,including extreme gradient boosting(XGBoost)and random forest(RF)algorithms,were used to analyze and identify the soil parameters that have a significant impact on the reduction of groundwater *** was found that the permeability coefficient and saturation are the primary factors that influence the reduction of groundwater ***,the prediction models developed by XGBoost and RF were compared,and their accuracy was *** research findings can serve as a reference for designing underground structures that can withstand the potential risk of buoyancy in clay.

关键词： Clay Buoyancy reduction coefficient Numerical simulation Model test Machine learning

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Air pollution perception among the residents and medical practitioners of an industrial cluster in a developing country

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Discover Environment 2025年第1期3卷 1-16页

作者： Saud, S. Jawahar Zacharias, Anshu George Sekar, Abinaya Binoy, B.V. Varghese, George Kuttiparichel Valsan, Aswathy Erat Civil Engineering Department Federal Institute of Science and Technology Kerala Anagamaly India National Institute of Technology Calicut Kerala Kozhikode India Indian Institute of Infrastructure and Construction Kerala Kollam India

Public perception on pollution and associated risks are important to plan and implement environmental health management programmes. The study was carried out to understand the perception of the residents near an industrial cluster on air pollution and its health impacts through a questionnaire survey. The survey included 28 questions across three areas: demography, general environment, and air pollution. To evaluate the perception of residents on their health vis-à-vis their actual health conditions, the medical practitioners working in the area were also interviewed. The association between the responses and the different demographic attributes of the respondents were explored using descriptive statistics. The study revealed that age had a significant influence on the perception of pollution, while gender, educational qualification, and length of residence had no significant influence. Based on the information shared by the medical practitioners, it is found that more than 100 residents approach them every day for conditions attributable to air pollution. The long-term environmental risk due to pollution among residents was rated 7 or above on a scale of 1 to 10 by the medical professionals. The PM_2.5 concentration monitored continuously at two locations within the residential area covering the period of survey showed that the mean values exceeded the levels prescribed by National Ambient Air Quality Standards. In spite of the negative perception and poor health conditions, there have been no major corrective interventions by the concerned authorities. The study highlights the proactive role a government should play for protecting the health of citizens. © The Author(s) 2025.

关键词： Air pollution Community health Industrial pollution Particulate matter Public perception

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A Study of Characteristics of the Mortar Produced from Waste Ceramic as a Fine Aggregate Replacement 8

A Study of Characteristics of the Mortar Produced from Waste...

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8th International Scientific Conference on Applying New technology in Green Buildings, ATiGB 2023

作者： Vo, Duy-Hai Ngo, Thi-My Phan, Nhat-Long Thi, Khanh-Dung Tran Truong, Thi Thu Ha The University of Danang University of Technology and Education Department of Civil Engineering Danang Viet Nam The University of Danang University of Technology and Education Department of Civil Engineering Danang Viet Nam National Taiwan University of Science and Technology Department of Civil and Construction Engineering Taipei Taiwan

ISBN: (纸本)9798350343977

The aim of this study is to investigate the strength development of mortar samples using waste ceramic (WCS) as a fine aggregate. The WCS was used as a partial replacement for river sand at 25%, 50%, 75%, and 100% for mortar production. The water-To-binder ratio was fixed at 0.4 and the fly ash (FA) was used at 15% of binder weight. The fresh properties of mortar samples were examined by flowability and fresh unit weight, while the compressive strength and electrical surface resistivity (ESR) of mortar specimens were evaluated up to 28 days of curing age. The influence of aggregate phases on the strength development of mortar samples was investigated with dry and saturated aggregate conditions during the mixing process. The testing results illustrated a reduction in flowability and fresh unit weight by using WCS to river sand. Besides, the compressive strength and ESR values also decreased with increasing WCS content. Using the saturated aggregate phase to produce the mortar samples presented a higher compressive strength than using the dry aggregate phase. © 2023 IEEE.

关键词： Compressive strength

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Application Research of the technology of New Integrated Formwork Equipment for Aerial Building construction

Application Research of the Technology of New Integrated For...

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2024 International Conference on construction and Real Estate Management: ESG Development in the construction Industry, ICCREM 2024

作者： Fang, Tingchen Gong, Jian Feng, Yu Fu, Xinli Zhu, Yimin Shen, Qingfeng College of Civil Engineering Tongji Univ. Shanghai China Shanghai Construction Group Co. Ltd. Shanghai China Shanghai Research Center of Intelligent Construction Engineering Technology for Super High-Rise Buildings Shanghai China

ISBN: (数字)9780784485910

ISBN: (纸本)9780784485910

The integrated steel platform aerial building formwork equipment is independently innovated and developed in China, which is mainly used for the construction of concrete structures in super high-rise buildings and high-rise structures. Based on the concept of industrialization and intelligent construction, key technical aspects of the integration of large mechanical equipment, such as tower cranes, dual-purpose elevators for people and cargos, concrete placing-booms, and integral steel platform aerial building formwork equipment, have been analyzed, including the connection method, climbing mode, and force transmission form. Key points of intelligent construction safety monitoring for integrated formwork equipment for aerial building construction are clarified and compared with other types of aerial building formwork equipment based on the application cases of Zikawei Center and Ningbo Center building projects, and the aspects where the new type of equipment needs to be improved have been summarized and analyzed. © ASCE.

关键词： Tower cranes

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Toward effective utilization of fly ash and multi-binder system with fly ash in concrete 15

Toward effective utilization of fly ash and multi-binder sys...

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15th International Conference on Concrete engineering and technology, (CONCET 2022

作者： Tantermsirikul, S. Saengsoy, W. Kaewmanee, K. Julnipitawong, P. Samranwanich, T. School of Civil Engineering and Technology Sirindhorn International Institute of Technology Thammasat University Pathumthani Thailand Construction and Maintenance Technology Research Center School of Civil Engineering and Technology Sirindhorn International Institute of Technology Thammasat University Pathumthani Thailand Department of Civil Engineering Burapha University Chonburi Thailand

This paper describes first the situation of fly ash in various ASEAN countries. Then the development of fly ash utilization in Thailand is discussed, which includes fly ash specification, standards on durability and service life design for fly ash concrete, and in the final, study results of application potential of various off-spec fly ashes are elaborated. Characteristics of fly ash in different ASEAN countries are different and have different problems. Thailand has 2 major sources of fly ash which have significantly different properties, especially CaO content (high and low CaO). Therefore, the standard specification of the Thai fly ashes classifies the fly ashes based on both quality classes (Classes 1, 2, and 3, with class 1 having the highest quality) and CaO content (high and low CaO). The effects of the fly ash were considered in the durability and service life design standard, for example in estimating the diffusion coefficient of chloride, critical chloride content, carbonation coefficient, and sulfate resistance. Lastly, examples of comparative study results on some off-spec fly ashes (high free lime, dumped wet, and high LOI fly ashes) are demonstrated. © Published under licence by IOP Publishing Ltd.

关键词： Fly ash

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Quality Assurance Management Practices in Public Building construction Projects: The Case of Bahir Dar City 10th

Quality Assurance Management Practices in Public Building Co...

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10th EAI International Conference on Advancements of Science and technology, EAI ICAST 2022

作者： Getie, Abrham Zegeye Mitikie, Bahiru Bewket Belay, Solomon Melaku University of Gondar Department of Construction Technology and Management Institute of Technology Gondar Ethiopia Faculty of Civil and Water Resources Engineering Bahir Dar Institute of Technology Bahir Dar University Bahir Dar Ethiopia Adama Science & Technology University Department of Civil Engineering Adama Ethiopia

ISBN: (纸本)9783031411724

Quality assurance (QA) is an important subject in the construction industry. The industry has been challenged with serious QA issues. The stakeholders of the industry (that is, clients, consultants, contractors, and the regulatory body) collectively play a vital role in addressing the challenges of QA in the industry. The research investigates or finds current and existing QA methods, techniques, and practices that determine the major factors that affect QA management practices, explores mechanisms to improve QA management practices, and prepares a conceptual framework for public construction projects in Bahir Dar City. The survey questionnaires conducted interviews, and case studies for three projects. The questionnaires were administered to the respondents (clients, consultants, contractors, and regulatory bodies in Bahir Dar) who were directly involved in the 26 public construction projects. The study points out that following instructions standards and codes, direct supervision, laboratory experiment, and inspection were major techniques for QA management practices. Project type and complexity, design, contract, materials, labor, and equipment were major factors that affect QA management practices, and management commitment, reducing miscommunication, and review/analysis were improving mechanisms for QA management practices for public construction projects in Bahir Dar City. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： construction project Management practices Public construction Quality Quality assurance Quality management

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