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A semi-infinite beam theoretical model on predicting rock slope subsidence induced by underground mining

Journal of Mountain Science 2024年第2期21卷 633-647页

作者： LIU Xinrong WANG Nanyun ZHONG Zuliang DU Libing LIANG Erwei School of Civil Engineering Chongqing UniversityChongqing 400045China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing 400044China Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education Chongqing 400045China School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China

When the mining goaf is close to the cliff,rock slope subsidence induced by underground mining is significantly affected by its boundary *** this study,an analytical method is proposed by considering the key strata as a semi-infinite Euler-Bernoulli beam rested on a Winkler foundation with a local subsidence *** analytical solutions of deflection are derived by analyzing the boundary and continuity conditions of the ***,the analytical solutions are verified by the results from experimental tests,FEM and InSAR,*** that,the influence of changing parameters on deflections is studied with sensitivity *** results show that the distance between goaf and cliff significantly affects the deflection of semi-infinite *** response of semi-infinite beam is obviously determined by the length of goaf and the bending stiffness of *** comparisons between semi-infinite beam and infinite beam illustrate the ascendancy of the improved model in such problems.

关键词： Key strata Mining rock slope Winkler foundation Euler-Bernoulli beam Subsidence prediction

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Study on the Mix Proportion of Waste Marble Powder-Ground Granulated Furnace Slag-Based Alkali-Activated Ultra-high Ductility Concrete 2nd

Study on the Mix Proportion of Waste Marble Powder-Ground Gr...

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2nd International Conference on Green Building, civil engineering and Smart City, GBCESC 2023

作者： Zhang, Yi Ren, Ruihao Mo, Binyu Mu, Rongcun Huang, Ting Liu, Bing Guangxi Key Laboratory of Green Building Materials and Construction Industrialization Guilin University of Technology Guilin541004 China College of Civil Engineering and Architecture Guilin University of Technology Guilin541004 China

ISBN: (纸本)9789819999460

The engineered cementitious composites (ECC) has an ultimate tensile strain more than 300 times that of regular concrete, making it highly promising for improving the seismic energy dissipation capacity of buildings, repairing damaged structures, and bridge expansion joints. However, the high CO2 emissions associated with the use of high cement content in ECC contradict the low-carbon and sustainable development principles of the building materials industry. In light of this, this paper investigates the use of solid waste-based alkali-activated cementitious materials to replace cement to prepare ground granulated blast furnace slag (GGBFS)-waste marble powder (WMP) -based alkali-activated ultra-high ductility concrete (AUHDC), achieving high-value utilization of solid waste and low-carbon preparation of ultra-high ductility engineering materials. This study assesses the key parameters of the WMP percentage in the precursor mixture, sand ratio, thickener content, and fiber composition on the tensile properties of AUHDC through uniaxial tensile tests. The results indicate that the ultimate tensile strain initially increases and then decreases with increasing WMP percentage in the precursor mixture, and it increases with increasing sand ratio. The thickener content does not significantly affect the ultimate tensile stress and strain, but the flowability decreases with increasing thickener content. The ultimate tensile strain of AUHDC with 2% polyvinyl alcohol (PVA) fiber and 2% polypropylene (PP) fiber is much lower than that of 1% ultra-high molecular weight polyethylene (PE) + 1% PP fiber and 2% PE fiber AUHDC. The ultimate tensile strain of AUHDC prepared with a WMP percentage of 50%, sand ratio of 55%, thickener content of 0.1%, and 1% PE + 1% PP fiber is 7.4%, which is 700 times that of regular concrete, and the ultimate tensile stress can also reach 6.2 MPa. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.

关键词： Slags

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Effect of water hyacinth ash on properties of concrete containing superplasticizer

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Discover civil engineering 2025年第1期2卷 1-13页

作者： Mitikie, Bahiru Bewket Ayalewu, Waltengus Zegeye Cherkos, Fikreyesus Demeke Department of Civil Engineering Adama Science and Technology University Adama Ethiopia Department of Construction Engineering and Management Wachamo University Hossana Ethiopia

Concrete is a composite material of cement, water, fine aggregate, and coarse aggregates. Among these, cement is the costliest component due to its energy-intensive manufacturing process, which produces significant carbon dioxide emissions and contributes to global warming. To address this issue, the research explores alternative materials like water hyacinth for concrete production, as they require less energy and reduce greenhouse gas emissions. Concrete construction sites also face challenges related to the flow of concrete, its weight, and noise pollution from vibrating equipment used for compaction. This research investigates the effect of superplasticizers on the properties of concrete incorporating water hyacinth ash and superplasticizer. The study examines concrete properties with varying proportions of cement replacement by water hyacinth ash (0%, 5%, 10%, and 15% by weight) and the addition of SP500 superplasticizer in a C-25 concrete mix. The slump test measurements for concrete samples containing 0%, 5%, 10%, and 15% water hyacinth ash were 31 mm, 46 mm, 61 mm, and 83 mm, respectively, at a constant water-cement ratio. In addition, the 28th day of compressive strength with 0%, 5%, 10%, and 15% water hyacinth ash as cement replacement were 30.5 MPa, 31.04 MPa, 32.12 MPa, and 28.21 Mpa respectively. Furthermore, an increased percentage of water hyacinth ash in the cement replacement led to slightly lower water absorption in the concrete. This suggests that the voids in the water hyacinth ash replacement concrete are less porous compared to the control mix concrete. The optimum quantity of water hyacinth ash (10% C was determined using the Technique for Order of Preference by Similarity to the Ideal Solution (TOPSIS) method. The experimental results demonstrate that incorporating superplasticizers with the optimal amount of water hyacinth ash significantly improves the workability, strength, and durability of concrete

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Preparation and Performance Study of Slag-Waste Marble Powder Based Alkali-Activated High Performance Concrete 2nd

Preparation and Performance Study of Slag-Waste Marble Powde...

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2nd International Conference on Green Building, civil engineering and Smart City, GBCESC 2023

作者： Deng, Xiaofang Lin, Weixin Li, Hongtao Li, Yuanju Weng, Yunhao Liu, Bing Guangxi Key Laboratory of Green Building Materials and Construction Industrialization Guilin University of Technology Guilin541004 China College of Civil Engineering and Architecture Guilin University of Technology Guilin541004 China

ISBN: (纸本)9789819999460

In this study, ground granulated blast-furnace slag (GGBS) and waste marble powder (WMP) were used as precursors to prepare slag-waste marble powder-based alkali-activated high-performance concrete (SWAHPC), and the effects and rules of different alkali activator modulus (1.0, 1.2, 1.4, 1.6, 1.8), Na2O dosages (4%, 7%, 10%), and WMP content (replacing 20%, 25%, 30%, 35%, 40% of GGBS) on the performance of SWAHPC were investigated. The results showed that excellent working performance and strength grade not lower than C85 high-strength concrete can be easily prepared when the WMP content does not exceed 40%. With increasing alkali activator modulus, the compressive strength of SWAHPC showed an increase followed by a decrease, while the flexural strength showed a decreasing trend, and the setting times and fluidity all exhibited an increasing trend. With increasing Na2O dosage, the compressive strength of SWAHPC showed an increasing and then decreasing trend, while the flexural strength showed a decreasing trend, the setting time showed an increasing trend, and the fluidity showed an increasing and then decreasing trend. With increasing WMP content, both the compressive and flexural strengths of SWAHPC showed an increase followed by a decrease, the setting times showed an increasing trend, and the fluidity showed a decreasing trend. The optimal values for the alkali activator modulus, Na2O dosage, and WMP content were 1.6, 7% and 25%, respectively for the compressive strength. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.

关键词： High performance concrete

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Thermal Behavior of Old and Recent Façades 8

Thermal Behavior of Old and Recent Façades

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8th International Technical Conference on Frontiers of Hydraulic and civil engineering technology, HCET 2023

作者： Khatib, Milad Mahmoud, Bassam Engineering Department Lebanese International University Mouseitbeh Beirut Lebanon Civil Engineering and Construction Technology Department University of Balamand Souq El Ghareb Aley Lebanon Department of Civil Engineering ISSEA-Cnam Zkak Blat Maurice Barres Beirut Lebanon

ISBN: (纸本)9781643684642

Losing heat additionally results in greater energy expenses and waste of resources. In any construction building, the façades ensure the heat transfer between the exterior and the interior surfaces of the structure. The thermal transfer of a façade is dominated by conduction. This exchange makes them responsible for guaranteeing thermal comfort to the occupants. Uninsulated outside walls can cause substantial heat loss, particularly during the winter. The heat is able to pass via such façade, leaving it hard to keep the appropriate temperature inside the construction. Furthermore, there is traditional outside insulation that uses isolative boards, which come in a variety of materials. They require a coat of render on top to provide additional protection from the outdoors as well as a beautiful finish. Impermeability and additional costs are the main disadvantages of such systems. In recent façades (rainscreens), the use of ventilated or unventilated cavities influences the thermal resistance. The rainscreen tends to have lower thermal transmittance than the stone façade. The thermal transmittance of the curtain wall depends on the thermal transmittance of the glazing and that of the mullions/transoms including the spacer of the double-glazing, calculated from a 2D analysis, so the total thermal transmittance will be a weighted average value. Surface or interstitial condensation occurs when humid air touches a surface T less than the dew point temperature;it is less likely to occur in a recent façade than in an old one. The aim of this topic is to achieve an energy comparison between two identical resident structures. The first one was provided with an old façade;however, the other house had a recent façade. The obtained results show an important saving of energy of the recent façade (refund in electricity bills), ensures thermal comfort, reduces embodied carbon, and protects the planet, the atmosphere, and the environment. © 2023 The Authors.

关键词： Thermal comfort

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A VALUE-BASED MULTI-CRITERIA DECISION-MAKING APPROACH TOWARDS FLOATING HOUSE DEVELOPMENT: A CASE STUDY IN HONG KONG

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Journal of civil engineering and Management 2022年第3期29卷 223-237页

作者： Wang, Xinhao Xu, Shi-Yu Leung, Mei-Yung Liang, Qi Department of Architecture and Civil Engineering City University of Hong Kong Hong Kong Department of Teaching Wuxi Kuangyuan Bilingual School Wuxi China Department of Civil & Construction Engineering National Taiwan University of Science & Technology Taipei Taiwan School of Civil Engineering and Geomatics Southwest Petroleum University Chengdu China

This study aims at investigating the cost-effectiveness of developing a new type of house, the floating house, as a solution to land scarcity in metropolitan coastal cities. Under value management framework, the "function analysis system technique" diagram was established to identify the functions of land-based and floating houses. Participants with different backgrounds shared their views through the two designed questionnaires, assisting in determining the cost allocation and functional performance levels of the houses. Fuzzy set theory was utilized to convert the collected professional knowledge and public opinions into numerical measurements. The obtained function values disclosed that, despite weaknesses in the conventional living and structural issues, the floating house still shows competitiveness and opportunities in customer at-traction, environmental sustainability, and encouraging local tourism. This paper offers the evidence and reference to both practitioners and governments seeking for a better value of the money they invest in future floating house projects. © 2023 The Author(s). Published by Vilnius Gediminas Technical University.

关键词： Fuzzy set theory

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Probabilistic analysis of gravity retaining wall against bearing failure

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Asian Journal of civil engineering 2023年第8期24卷 3099-3119页

作者： Mustafa, Rashid Samui, Pijush Kumari, Sunita Mohamad, Edy Tonnizam Bhatawdekar, Ramesh Murlidhar Department of Civil Engineering National Institute of Technology Patna Bihar Patna 800 005 India Centre of Tropical Geoengineering (GEOTROPIK) Institute for Smart Infrastructure and Innovative Construction (ISIIC) Department of Civil Engineering Universiti Teknologi Malaysia Johor 81310 Malaysia

Machine learning (ML) models have been extensively used in the stability check of gravity retaining wall. They are renowned as the most capable methods for predicting factor of safety (FOS) of gravity retaining wall against bearing failure. In this work, FOS against bearing is predicted based on extreme gradient boosting (XGBoost), random forest (RF) and deep neural network (DNN). To establish homogeneity and distribution of datasets, Anderson−Darling (AD) and Mann−Whitney U (M−W) tests are carried out, respectively. These three machine learning models are applied to 100 datasets by considering six influential input parameters for predicting FOS against bearing failure. The execution of the established machine learning models is assessed by several performance parameters. The obtained results from computational approach shows that DNN attained the best predictive performance with coefficient of determination (R ²) = 0.998 and root mean square error (RMSE) = 0.006 in the training phase and R ² = 0.929 and RMSE = 0.053 in the testing phase. The models result are also analyzed by using rank analysis, regression error characteristics curve, and accuracy matrix. Sensitivity analysis is carried to know the relative importance of input variables. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： DNN Rank analysis Reliability analysis RF Statistical testing Uncertainty analysis XGBoost

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Shear strength and shear behaviour of H-beam and cruciform-shaped steel sections for concrete-encased composite columns

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Steel and Composite Structures 2023年第3期47卷 423-436页

作者： Lin, Keng-Ta Chen, Cheng-Cheng Department of Civil and Environmental Engineering National University of Kaohsiung No.700 Kaohsiung University Rd. Kaohsiung811 Taiwan Department of Construction Engineering National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd Taipei106 Taiwan

In this research, we tested 10 simply supported concrete-encased composite columns under monotonic eccentric loads and investigated their shear behaviour. The specimens tested were two reinforced concrete specimens, three steel-reinforced concrete (SRC) specimens with an H-shaped steel section (also called a beam section), and five SRC specimens with a cruciform-shaped steel section (also called a column section). The experimental variables included the transverse steel shape’s depth and the longitudinal steel flange’s width. Experimental observations indicated the following. (1) The ultimate load-carrying capacity was controlled by web compression failure, defined as a situation where the concrete within the diagonal strut’s upper end was crushed. (2) The composite effect was strong before the crushing of the concrete outside the steel shape. (3) We adjusted the softened strut-and-tie SRC (SST-SRC) model to yield more accurate strength predictions than those obtained using the strength superposition method. (4) The MSST-SRC model can more reasonably predict shear strength at an initial concrete softening load point. The rationality of the MSST-SRC model was inferred by experimentally observing shear behaviour, including concrete crushing and the point of sharp variation in the shear strain. Copyright © 2023 Techno-Press, Ltd.

关键词： Reinforced concrete

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construction Monitoring and Analysis of Asymmetric Prestressed Concrete Bridge Crossing Multiple-Line Railways

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Structural Durability & Health Monitoring 2025年第2期19卷 385-398页

作者： Yi Wang Bing Wang Changwen Li Feng Zheng Yong Liu Shaohua He Guangzhou Railway Investment Construction Group Co. Ltd.Guangzhou510000China China Railway Third Bureau Group Co. LtdTaiyuan030024China School of Civil and Transportation Engineering Guangdong University of TechnologyGuangzhou510006China

Complex bridge structures designed and constructed by humans often necessitate extensive on-site execution,which carries inherent ***,a variety of engineering practices are employed to monitor bridge *** paper presents a case study of a large-span prestressed concrete(PC)variable-section continuous girder bridge in China,proposing a feedback system for construction monitoring and establishing a finite element(FE)analysis model for the entire *** alignment of the completed bridge adheres to the initial design expectations,with maximum displacement and pre-arch differences from the ideal state measuring 6.39 and 17.7 mm,respectively,which were less than the 20 mm limit required by the ***,the stress monitoring showed that the maximum compressive stress was 10.44 MPa,which was 7.5%different from the finite element results,and better predicted the most unfavorable possible *** results demonstrate that a scientifically rigorous construction monitoring and feedback system can ensure the safety of bridge construction and meet the expected construction *** findings presented in this paper provide valuable insights for bridge construction monitoring practices.

关键词： Continuous girder bridge construction monitoring bridge alignment stress monitoring

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Comparative Assessment of Artificial Neural Networks and RORB Model in Simulating Catchment Runoff: A Case Study of East Melbourne

Comparative Assessment of Artificial Neural Networks and ROR...

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2023 IEEE Conference on engineering Informatics, EI 2023

作者： Balacumaresan, Harshanth Imteaz, Monzur Aziz, Md Abdul Choudhury, Tanveer Swinburne University of Technology Department of Civil and Construction Engineering Melbourne Australia Melbourne Water Corporation Melbourne Australia School of Engineering Information Technology and Physical Sciences Federation University Australia Churchill Australia

ISBN: (纸本)9798350338522

Australia's surging climate vulnerability status has amplified the likelihood for prevalence of more recurrent and austere intense rainfall events, triggering an incessant residual flooding risk within the urban landscape. The complex topography and inherent non-linearity of influential hydrological processes of urban catchments limits the prediction accuracy of conventional hydrological models, leading to over/(under)estimation of expected flood flow. Recently, Artificial Neural Networks (ANNs) have shown commendable progress in offsetting most limitations allied with conventional models - especially in simulating highly complex, non-linear relationships without understanding underlying physical processes. Thus, this research proposes an ANN-based enhanced accuracy flow estimation model for accurate simulation of expected flood flow in urban catchments. Gardiners Creek catchment, located in east Melbourne was selected as the study area, where the model is calibrated with historical storm event data and performance is assessed against Victorian Water Industry standard hydrological model, RORB results. The study results depict that the ANN model outperforms the Runoff Routing Burroughs (RORB) model, in terms of superior performance, excellent predictive skill and lower minimal error, highlighting that the ANN model has good understanding and is capable of accurately modelling the current catchment response state to storm events, and can be considered for implementation in improving the accuracy of current flood flow estimation practices, and also for tackling emerging challenges in flood investigation process due to climate change impacts. © 2023 IEEE.

关键词： Runoff

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