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Effect of Stratum Distribution on Deep Circular Excavation with Dewatering Above a Multi-Aquifer System by Hydro-Mechanical Coupled Numerical Analysis

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Journal of Shanghai Jiaotong University (Science) 2024年 1-11页

作者： Yan, Yueheng Li, Mingguang Xu, Zhonghua Pan, Chunhui Department of Civil Engineering Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure Shanghai Jiao Tong University Shanghai200240 China Shanghai Underground Space Engineering Design & amp Research Institute East China Architecture Design & ampResearch Institute Co. Ltd. Shanghai200002 China Shanghai Municipal Engineering Design Co. Ltd. Shanghai200092 China

Dewatering in multilayered aquifers is closely related to stratigraphic configuration. However, previous studies concentrate on the excavation response to dewatering in particular strata, lacking systematic study on the influence of stratum configuration. This study developed a hydro-mechanical coupled numerical model based on the practical engineering of Shanghai Tower deep excavation. The model and input parameters were validated by field measurements. Besides, a parametric study was conducted to investigate the effect of the thickness, permeability and depth of the aquitard on excavation performances. The analysis indicated that settlements in the excavation were insensitive to the thicknesses and permeability of aquitards, while ground surface settlement increased significantly with the increase of the confined aquifer thickness. Based on the numerical analysis, a fit relationship was established to predict the maximum ground settlements of deep excavation in Shanghai considering the excavation depth, groundwater drawdown and distribution of multilayered aquifers. The applicability of the fit equation was verified by field measurements. © Shanghai Jiao Tong University 2024.

关键词： Dewatering

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Predicting the Number of Registered Vehicles, Road Accident, and Road Accident Deaths Using Winter–Holt’s Seasonal Forecasting Method

Predicting the Number of Registered Vehicles, Road Accident,...

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International Conference on Innovation in Smart and Sustainable infrastructure, ISSI 2022

作者： Saxena, Aditya Prashant, Atri Shrivastava, Bhavana Centre for Urban Science and Engineering Indian Institute of Technology Bombay Mumbai India Ranbir and Chitra Gupta School of Infrastructure Design and Management Indian Institute of Technology Kharagpur Kharagpur India Department of Architecture and Planning MNIT Jaipur Jaipur India

ISBN: (纸本)9789819739936

Road accidents are one of the foremost causes of death in India. Every year almost 1.5 lakh people die in road accidents. India ranks first and accounts for 11% of the road-related deaths in the world (Transport Research Wing, Road accidents in India 2019). To mitigate such an epidemic, every year, the Ministry of Road Transport and Highways (MORTH) reviews, documents, and conducts studies to understand and analyze the road safety scenario. The review report published by MORTH suggests some standards and parameters for assessment. The status report published by MORTH considers the growth in the number of registered vehicles, the number of road accidents, and road accident deaths per year as prominent parameters of evaluation. However post-COVID-19, figures are not available on these parameters. The present study is an attempt to evaluate the figures on road accident rate and road accident death rate. For predicting the data of vehicle registration and road accidents, Winter–Holt’s seasonal forecasting method is used. According to the Holt–Winter’s seasonal forecasting method, it is forecasted that 34, 64, 09,000 registered vehicles, 3, 79,000 road accidents, and 1, 23,000 road accident fatalities will occur in 2021. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Forecasting

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QUESTIONNAIRE SURVEY RESULTS ON CURRENT SOUND INSULATION PERFORMANCE AND SATISFACTION LEVELS IN MULTISTOREY DWELLINGS FOR SALE AND FOR RENT PART 1: CLARIFICATION OF OCCUPANT AND BUILDING ATTRIBUTES AND IDENTIFICATION OF CURRENT ISSUES ON SOUND INSULATION PERFORMANCE

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Journal of Environmental engineering (Japan) 2023年第805期88卷 154-161页

作者： Hirakawa, Susumu Hiramitsu, Atsuo Tomita, Ryuta Abe, Kyoko Equipment Standards Division Building Department National Institute for Land and Infrastructure Management Japan Dept. of Environmental Engineering Building Research Institute Japan Dept. of Architecture College of Science and Technology Nihon Univ Japan Dept. of Design College of Art Nihon Univ Japan

A questionnaire survey was conducted for the clarification of the current state of satisfaction on sound insulation performance in the multistorey dwellings for sale and for rent. The result suggested that the situation was the same with the study completed in 1970s: the floor impact sound insulation performance was one of the most unsatisfied attributes. In addition, tendency of the room type (i.e. 1K or 3LDK), family structures (i.e. single or with kids) and architectural specification (i.e. structure types of the building) on the multistorey dwelling for sale and for rent was different. © 2023 Architectural Institute of Japan. All rights reserved.

关键词： Housing

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A review of fresh properties of self-compacting concrete incorporating sugarcane bagasse ash

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Materials Today: Proceedings 2022年 65卷 852-859页

作者： Das, Debadrita Saravanan, T. Jothi Bisht, Kunal Kabeer, K.I. Syed Ahmed Indian Institute of Technology Bhubaneswar School of Infrastructure Bhubaneswar India KIET Group of Institutions Department of Civil Engineering Delhi NCR India SRM Institute of Science and Technology School of Architecture and Interior Design Chennai India

Self-compacting concrete (SCC) is a new generation concrete having high deformability in the fresh state and the ability to compact by itself without the use of vibrators, thus reducing time and labor. They are widely used nowadays in zones of congested reinforcements in concrete elements and structures. To achieve the necessary performance targets, SCC requires higher use of viscosity modifying agents and superplasticizers, which increase the cost of production significantly. Thereby, studies are being conducted for incorporating the use of agricultural wastes as partial substitutes for cement in SCC production to bring down the usage of the admixtures, along with lowering the cost. Agricultural wastes, such as sugarcane bagasse ash (SBA), a waste generated from the sugar industry, if used as a partial replacement to cement after suitable processing, improve the fresh properties of SCC. The effect of fresh properties of SCC by the addition of SBA, as investigated by different authors is reviewed in this study. Results of slump flow test, V-funnel test, T500, L-box and J-ring test, obtained from the different papers are compiled and optimum content of SBA that has to be used for the required performance is concluded. Slump flow was observed to decrease with increasing SBA content in SCC, due to higher water absorption of the SBA particles, resulting in a more viscous concrete mix. Similarly, V-funnel time increased due to the increased viscosity. An increase was observed in T500, the time required for the slump flow to reach a diameter of 500 mm, as well. Thus, from analysis of the changes in the fresh properties, this literature review has helped us identify that a replacement of 10–15% cement with sugarcane bagasse ash provides desirable results. © 2022

关键词： Self compacting concrete

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Leaching and Heavy Metal-Binding Characteristics of Red Mud-Based Construction Materials—A Review

Leaching and Heavy Metal-Binding Characteristics of Red Mud-...

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International Conference on Structures, Materials and Construction, ICSMC 2021

作者： Kumar, Aman Jothi Saravanan, T. Syed Ahmed Kabeer, K.I. Bisht, Kunal School of Infrastructure Indian Institute of Technology Bhubaneswar Bhubaneswar India School of Architecture and Interior Design SRM Institute of Science and Technology Chennai India Department of Civil Engineering KIET Group of Institutions NCR Delhi India

ISBN: (纸本)9789811940392

The production of Ordinary Portland Cement (OPC) extensively used in construction causes significant environmental damage. With an ongoing attempt at replacing OPC by using numerous waste materials, there is a need to understand the environmental impact of using these contemporary construction materials. It is imperative to appraise heavy metals’ discharge to the soil and the aquatic environment in this domain. Red mud (RM) is one such hazardous waste material utilized to prepare the alkali-activated binders and geopolymers. This paper presents a critical review of RM-based construction materials’ leaching and heavy metal-binding characteristics. The RM particles have a strong capability to absorb pollutants owing to their smaller particle size, large porosity, and large specific surface area. The leaching of heavy metals observed in the geopolymer samples reduced significantly when compared to their corresponding source materials, which helped solidify the heavy metals, serving as a promising material for constructing green buildings. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Global warming

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Challenges and considerations of applying nature-based solutions for future mega-cities: Implications for Karachi as a Sponge City

Human Settlements and Sustainability

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Human Settlements and Sustainability 2025年第1期1卷 50-61页

作者： Lubaina Soni Asifa Iqbal Faseeha Waheed Ayesha Agha Shah Naji Akbar Green Infrastructure Research Group School of Ecosystem and Forest Sciences The University of Melbourne Australia Department of Computer and Geospatial Sciences Faculty of Engineering and Sustainable Development University of Gavle Sweden Architect and Urban Designer (Freelancer) Pakistan Department of Architecture and Interior Design College of Engineering University of Bahrain Bahrain Department of Interior Design College of Architecture Art and Design Ajman University Ajman UAE

Rapid urbanization contributes to impervious surface areas resulting in higher vulnerability to flooding and loss of green spaces. Recently, sustainable methods like nature-based solutions (NBS) are effectively being used to build resilient cities. These are practices derived from nature by emulating and regulating ecosystem services. Specifically, the adaptation of sponge city (SC) concept as part of NBS is being extensively used in growing cities to help mitigate impacts of development. This study focuses on difficulties encountered by Karachi, such as extreme weather occurrences and flooding. It examines the feasibility of implementing SC methods drawing inspiration from successfully implemented examples of China and Saudi Arabia. The outcomes indicate significance of incorporating NBS and adoption of SC elements in urban planning to provide remedies for Karachi's environmental challenges.

关键词： Urbanization Stormwater management Flood mitigation Nature-based solutions Sponge city Karachi

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A Critical Review of Utilization of Sugarcane Bagasse Ash in Concrete as Partial Replacement to Cement 2nd

A Critical Review of Utilization of Sugarcane Bagasse Ash in...

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2nd International Conference on Materials, Mechanics and Structures, ICMMS 2022

作者： Das, Debadrita Saravanan, T.Jothi Kabeer, K.I.Syed Ahmed Bisht, Kunal School of Infrastructure Indian Institute of Technology Bhubaneswar Bhubaneswar India School of Architecture and Interior Design SRM Institute of Science and Technology Kattankulathur India Department of Civil Engineering KIET Group of Institutions Delhi NCR Ghaziabad India

ISBN: (纸本)9789811933707

There have been rising concerns relating to increasing carbon footprint over the *** major reasons for the cause of increase in carbon footprint was due to excessive production of cement and inappropriate trash handling and maintenance of *** concerns resulted in a lot of studies being done on the use of sugarcane bagasse ash (SBA) in building materials.A thorough examination of the usage of SBA as partial replacement to cement in concrete is essential to comprehend the large scale of papers published in this field over the past two *** a result, this article summarizes the corpus of information on concrete characteristics upon incorporation of SBA, mainly focused on the fresh and mechanical *** to this review, SBA is a novel supplemental cementitious *** workability of mixes with SBA depends on its fineness when compared to cement and can be attained by suitable incorporation of *** improves when SBA content is in the range of 5–10%.Though its usage increases the porosity of the concrete, it has been proven that using SBA is helpful for improving chloride resistance of concrete and to decrease environmental problems. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Cements

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Appraising the Influence of Ceramic Waste Incorporation on the Corrosion and Chemical Attack Resistance of Cement Composites: A Review

Appraising the Influence of Ceramic Waste Incorporation on t...

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International Conference on Structures, Materials and Construction, ICSMC 2021

作者： Agrawal, Anjali Jothi Saravanan, T. Kabeer, K. I. Syed Ahmed Bisht, Kunal Department of Civil and Environmental Engineering Politecnico di Milano Milano Italy School of Infrastructure Indian Institute of Technology Bhubaneswar Bhubaneswar India School of Architecture and Interior Design SRM Institute of Science and Technology Chennai India Department of Civil Engineering KIET Group of Institutions Delhi NCR Uttar Pradesh Ghaziabad India

ISBN: (纸本)9789811940392

The exploitation of waste material in the production of cementitious composites such as mortar and concrete is featured as an emerging research area aiming to curtail cement requirements. This article focuses on the utilisation of ceramic waste for partial cement replacement, reviewing its influence on the corrosion and chemical attack resistance of cementitious composites. The reviewed literature majorly highlights an enhancement in corrosion and chemical attack resistance on exposure to sulphate and chloride attacks for composites having up to 40% ceramic waste. The bulk electrical resistivity test and the rapid chloride penetration test indicated superior corrosion protection on incorporating high ceramic waste content. The pozzolanic reaction and filling effect of ceramic waste favour microstructure refinement and densification, reducing pore connectivity and improving corrosion and chemical attack resistance. The evaluation of the feasibility of using ceramic waste lays out a sustainable choice for achieving desirable properties while simultaneously recognising environmental benefits, reducing the carbon footprint of the construction industry. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Sulfur compounds

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An Employability Skills Model for Built Environment Graduates: A Partial Least Squares Structural Equation Modeling Analysis

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International Journal of Construction Education and Research 2025年第1期21卷 74-93页

作者： Aliu, John Aghimien, Douglas Aigbavboa, Clinton Oke, Ayodeji Emmanuel Ebekozien, Andrew Institute for Resilient Infrastructure Systems College of Engineering University of Georgia Athens GA United States School of Art Design and Architecture Faculty of Arts Design and Humanities De Montfort University Leicester United Kingdom SARChi in Sustainable Construction Management and Leadership in the Built Environment Faculty of Engineering and the Built Environment University of Johannesburg Johannesburg South Africa Research Group on Sustainable Infrastructure Management Plus (RG-SIM+) Department of Quantity Surveying Federal University of Technology Akure Ondo Akure Nigeria CIDB Centre of Excellence Faculty of Engineering and Built Environment University of Johannesburg Auckland Park Gauteng South Africa School of Social Sciences Universiti Sains Malaysia Pulau Pinang Minden Malaysia Department of Quantity Surveying Auchi Polytechnic Edo Auchi Nigeria

This study presents a six-construct employability skills model for built environment graduates in the context of the Fourth Industrial Revolution (4IR). The model examines the influence of generic skills, discipline-specific skills, work-integrated learning, emotional intelligence, university-industry collaboration and 4IR knowledge on graduate employability. A mixed-method approach was employed, including the Delphi technique for qualitative analysis and a well-structured questionnaire for quantitative analysis. The findings highlight the significant impact of work-integrated learning on improved employability, while also revealing the direct influence of other exogenous variables. Notably, discipline-specific skills showed a weaker influence. This research contributes to the field by presenting a tailored employability skills model for built environment graduates, addressing the sector’s unique challenges in the 4IR era. The study also offers practical implications for stakeholders involved in employability skills development. Overall, this study provides a substantive contribution to the research area of engineering education and graduate employability in the context of 4IR. In an ever-evolving job market shaped by technological advancements, this study underscores the importance of equipping built environment graduates with a diverse set of skills and knowledge to thrive in the dynamic landscape of the 4IR. © 2024 Associated Schools of Construction.

关键词： Built environment construction education employability fourth industrial revolution higher education skills revolution

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Sustainable approach to quality assurance in cement-improved soil: applications of handheld XRF for geotechnical solutions

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Smart Construction and Sustainable Cities 2024年第1期2卷 1-21页

作者： Sindete, Mathiro José Usui, Hirofumi Some, Donzala David Hino, Takenori Civil Engineering and Architectural Design Course Graduate School of Science and Engineering Saga University Saga Japan Department of Civil Engineering and Architecture Faculty of Science and Engineering Saga University Saga Japan Ministry in Charge of Infrastructure General Secretariat Ouagadougou Burkina Faso

Traditional methods for evaluating the quality of the Deep Mixing Method (DMM) in Japan, such as the phenolphthalein tracer method, present limitations in ensuring strength improvement. This study explores handheld X-ray fluorescence (XRF) as a sustainable alternative for quality assessment. The elemental composition of cement-treated soil was investigated, focusing on Calcium (Ca), Silicate (Si), and Sulfate (S), which play crucial roles in the formation of hydrated products, aiming to accurately determine their influence on the strength development of the improved soil. A controlled protocol was employed using commercial Kaolin clay and the needle penetration test for strength assessment. Our laboratory experiments, conducted with a cement-based binder (C) dosage of 110 kg/m3 and a water-cement (W/C) ratio of 1, furthered our understanding of the hydration process. Results indicate an apparent increase in Ca amount over time, correlating with improved strength, while the apparent amount of Si decreases, suggesting its integration into hydration products such as C-S–H gel. Strength assessment rose significantly between day 1 and 28, aligning with variations observed in Si, Ca, and S, underlining their role in strength evolution. This research underscores the potential of handheld XRF as a sustainable substitute for conventional methods in field-quality assurance, offering real-time data on the formation of possible hydrated products during the hydration process for improved soil in geotechnical engineering.

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