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Research on engineering Education and Management of Early-Strength Sludge Fluidized Soil Used for Backfilling of Pipes and Trenches of Polluted Water 5th

Research on Engineering Education and Management of Early-St...

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5th International Symposium on Water Pollution and Treatment, ISWPT 2022

作者： Fang, Yuan Jiang, Pengming Xu, Haoqing Zhou, Aizhao Lv, Yiyan Zhang, Heng Physical Education College Jiangsu University of Science and Technology Zhenjiang212100 China Jiangsu Province Engineering Research Center of Geoenvironmental Disaster Prevention and Remediation of School of Architecture and Civil Engineering Jiangsu University of Science and Technology Zhenjiang212100 China Zhejiang Huadong Construction Engineering Co. LTD Hangzhou310014 China

ISBN: (纸本)9789819937363

In order to resourcefully utilize the sludge generated every year, guarantee the backfilling quality of pipes and trenches of polluted water, and accelerate the construction progress, as well as reduce the cement usage amount to lower the engineering costs, the experiment was carried out to prepare the early strength sludge fluidized soil by replacing sulphoaluminate cement with slag in equal amount. Through exploring the influence of different sludge moisture contents and slag replacement rates on the fluidity and filling ability of fluidized soil, and analyzing the influence of different sludge moisture contents, slag replacement rates and periods on the compressive strength of fluidized dynamic soil, it is inferred that the fluidity of the fluidized soil increases linearly with the increase of the moisture content of sludge and remains basically unchanged with the changes of the slag replacement rate. The compressive strength decreases linearly with the increase of sludge moisture content and slag replacement rate, and increases with the increase of period. The filling rate of fluidized soil can reach over 97%, which can solve the backfilling quality problem of pipes and trenches of polluted water better. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Compressive strength

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Analysis of strength characteristics of loess before and after freezing using a hollow cylinder torsional shear apparatus

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Research in Cold and Arid Regions 2024年第2期16卷 63-72页

作者： Peng Shen QingZhi Wang JianHong Fang ChenWei Wang Kui Zhang School of Civil Engineering and Water Resources Qinghai UniversityXiningQinghai 810016China Qinghai Scientific Research Observation Base Key Laboratory of Highway Construction and Maintenance Technology in Permafrost RegionsMinistry of TransportXiningQinghai 810016China

This paper aims to comprehensively analyze the influence of the principal stress angle rotation and intermediate principal stress on loess's strength and deformation characteristics. A hollow cylinder torsional shear apparatus was utilized to conduct tests on remolded samples under both normal and frozen conditions to investigate the mechanical properties and deformation behavior of loess under complex stress conditions. The results indicate significant differences in the internal changes of soil particles, unfrozen water, and relative positions in soil samples under normal and frozen conditions, leading to noticeable variations in strength and strain *** frozen state, loess experiences primarily compressive failure with a slow growth of cracks, while at normal temperature, it predominantly exhibits shear failure. With the increase in the principal stress angle, the deformation patterns of the soil samples under different conditions become essentially consistent, gradually transitioning from compression to extension, accompanied by a reduction in axial strength. The gradual increase in the principal stress axis angle(α) reduces the strength of the generalized shear stress and shear strain *** an increasing α, frozen soil exhibits strain-hardening characteristics, with the maximum shear strength occurring at α = 45°. The intermediate principal stress coefficient(b) also significantly impacts the strength of frozen soil, with an increasing b resulting in a gradual decrease in generalized shear stress strength. This study provides a reference for comprehensively exploring the mechanical properties of soil under traffic load and a reliable theoretical basis for the design and maintenance of roadbeds.

关键词： Loess Hollow cylinder torsional shear apparatus Major principal stress angle Intermediate principal stress coefficient

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Computer vision-based deep learning for supervising excavator operations and measuring real-time earthwork productivity

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Journal of Supercomputing 2023年第4期79卷 4468-4492页

作者： Cheng, Min-Yuan Cao, Minh-Tu Nuralim, Christian Kentaro Department of Construction and Civil Engineering National Taiwan University of Science and Technology #43 Sec. 4 Keelung Rd. Taipei10607 Taiwan Department of Civil Engineering National Yang Ming Chiao Tung University No. 1001 Daxue Rd East Dist. Hsinchu City300093 Taiwan

Its significant influence on overall progress makes excavator productivity a major concern of construction project managers, particularly during initial-stage earthwork activities. The ability to track excavator performance autonomously in real time is essential to monitoring and managing earthwork effectively. A novel, vision-based autonomous excavator action recognition and productivity measurement is introduced in this study that integrates the you only watch once deep learning method to recognize excavator actions, which are used to calculate action time and average cycle time. The average cycle time is then used to calculate the productivity of excavation work. The images of the excavator action used to construct the model were extracted from a video recorded at the construction site. The algorithm recognized excavator actions with an F1 score of 87.6% and mAP value of 81.6%. The outputs were then used in the proposed framework to measure excavator productivity. Omitting the outliers/misclassifications ( © 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

关键词： Excavation

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Disaggregation of Rainfall to Finer Temporal Resolutions for Developing Non-Stationary IFD Curves employing an analytical approach

Disaggregation of Rainfall to Finer Temporal Resolutions for...

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2024 Hydrology and Water Resources Symposium, HWRS 2024

作者： Balacumaresan, Harshanth Hossain, Iqbal Imteaz, Monzur Alam Department of Civil and Construction Engineering Swinburne University of Technology Melbourne Australia

ISBN: (纸本)9781925627893

The robust regional and seasonal variability exhibited in Australian rainfall patterns, superimposed by the large-scale-continental-climate-volatility, is expected to further intensify under climate change impacts, altering the recurrence and austerity of extreme rainfall intensity event(s) prevalence. This needs to be conscientiously addressed while developing Intensity-Frequency-Duration (IFD) curves for employment in the design of flood-mitigation-infrastructure. Current Australian IFD practices are developed based upon the temporal-stationarity-concept, thereby calling for updated IFD practices based upon non-stationarity approaches for future flood mitigation/planning. However, a major obstacle in the adaptation of this approach is centred around the unavailability of projected future rainfall data records at sub-hourly/sub-daily timescales. This has led to extensive research being undertaken on various rainfall disaggregation techniques, using both stochastic and analytical methods. This paper proposes the novel application of one such analytical method, an empirical reduction formula used by the Indian Meteorological Department, dubbed as the IMD Equation, for disaggregating Australian daily rainfall data into sub-daily/sub-hourly timescales. The proposed method is attested on an Eastern Melbourne urban catchment, Gardiners Creek, with good-quality observed rainfall data. Following initial appraisal using the original IMD equation, modified variations of the formula, Modified-IMD (MIMD) and Modified Chowdhury-IMD (MCIMD) formulae, calibrated to befit Australian catchment characteristics are applied and evaluated. The results highlight that the application of the MCIMD approach exhibited supremacy over the other two approaches in the accurate replication of the observed temporal variability in the annual maxima rainfall timeseries at the sub-daily/sub-hourly timesteps, with high estimation accuracy (R2 = 91-96% & NSE = 0.90-0.96) and minimum error magnitude (M

关键词： Rain

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Risk-Reward Allocation among Integrated Project Delivery Method Stakeholders: A Gamified Cooperative Data Simulation Approach

Risk-Reward Allocation among Integrated Project Delivery Met...

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ASCE International Conference on Computing in civil engineering 2023: Visualization, Information Modeling, and Simulation, i3CE 2023

作者： Eissa, Radwa Abdul Nabi, Mohamad El-Adaway, Islam H. Dept. of Civil Architectural and Environmental Engineering Missouri Univ. of Science and Technology RollaMO United States Hurst-McCarthy Professor of Construction Engineering and Management Prof. of Civ. Eng. and Founding Director of Missouri Consortium of Construction Innovation Dept. of Civ. Arch. and Environ. Eng. and Dept. of Engineering Management and Systems Engineering Missouri Univ. of Science and Technology RollaMO United States

ISBN: (数字)9780784485231

ISBN: (纸本)9780784485231

Integrated project delivery (IPD) method is associated with numerous benefits, including enhanced project performance, collaboration, and information sharing among project stakeholders. However, the lack of adequate incentive and reward mechanisms is still considered as the main reason for slowing down the adoption of IPD. As such, the goal of this paper is to identify a fair and efficient risk pool distribution among IPD project stakeholders. The adopted methodology included (1) assigning the risks associated with each stakeholder, (2) computing valuations for all possible subset coalitions among IPD project stakeholders that reflect their risk control capabilities as well as their coordination effects, and (3) utilizing cooperative game theory to generate fair and efficient distribution mechanisms given different a priori working and coalitional preferences. As such, a total of 22 risks were identified and quantified to calculate the risk control valuations of all subset coalitions using Monte-Carlo simulations. Afterward, these valuations were utilized to generate fair risk and reward distributions using the Shapley value and Owen value for games with a priori unions. The coalitional stability of the generated results was evaluated using propensity-to-disrupt ratios. Ultimately, the findings of this paper indicate that an IPD-multiparty agreement where all parties are engaged early on in establishing the contract results in the most balanced willingness to cooperate among stakeholders. Finally, the outcome of this paper equips industry practitioners with a distribution mechanism that corresponds to the adopted IPD relational configuration on one hand and the overall IPD project stability on the other. © 2024 Computing in civil engineering 2023: Visualization, Information Modeling, and Simulation - Selected Papers from the ASCE International Conference on Computing in civil engineering 2023. All rights reserved.

关键词： Game theory

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比较三种稳定剂对FeS纳米颗粒的稳定效果及对水土中镉的固定与去除性能的影响

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Journal of Central South University 2024年第4期31卷 1064-1075页

作者：田舒婷赵东叶霍丽娟马骏杨睿 Department of Environmental Science School of Environment and ResourcesTaiyuan University of Science and TechnologyTaiyuan 030024China Environmental Engineering Program Department of Civil&Environmental EngineeringAuburn UniversityAuburnAL 36849USA Department of Civil Constructionand Environmental EngineeringSan Diego State UniversitySan DiegoCA 92182USA

本研究评估了三种多糖稳定剂(羧甲基纤维素钠(CMC)、羧甲基淀粉钠(CMS)和一种水溶性淀粉)用于稳定FeS纳米颗粒的有效性,并测试了相应稳定化纳米颗粒在水和土壤中固定Cd^(2+)的性能。使用0.010 wt%CMC、0.025 wt%CMS或0.065 wt%淀粉可获... 详细信息

本研究评估了三种多糖稳定剂(羧甲基纤维素钠(CMC)、羧甲基淀粉钠(CMS)和一种水溶性淀粉)用于稳定FeS纳米颗粒的有效性,并测试了相应稳定化纳米颗粒在水和土壤中固定Cd^(2+)的性能。使用0.010 wt%CMC、0.025 wt%CMS或0.065 wt%淀粉可获得完全稳定的FeS纳米颗粒(100 mg/L FeS)。CMC-FeS表现出较高的zeta负电位,淀粉-FeS保持中性,而CMS-FeS则表现出中等负电位。CMCFeS对Cd^(2+)的吸附速率最快,吸附容量也最高。当用100 mg/L CMC-FeS或CMS-FeS处理一种含Cd土壤(58.3 mg/kg Cd)后,Cd的TCLP浸出率分别降低了88.4%和68.0%。CMC-FeS和CMS-FeS均可在模型土壤中运移,显示出其在土壤中原位固定Cd^(2+)方面的潜力。土壤穿透曲线实验表明,CMC-FeS在4.5个孔体积,CMS-FeS在约25个孔体积处几乎完全穿透。柱实验结果表明,当用55个孔体积的CMC-FeS或CMS-FeS悬浮液(100 mg/L)处理该含Cd土壤后,Cd的水浸出率分别降低了98.2%和98.0%。根据目标污染物、材料在土壤中的传输特性和材料成本,可找到这三种稳定剂在土壤修复中的最佳应用。

关键词：硫化铁纳米颗粒稳定剂重金属污染物固定土壤修复地下水污染

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Research on Sugarcane Recognition based on Joint Spatial and Spectral Information from Satellite-Based Hyperspectral Imagery

Research on Sugarcane Recognition based on Joint Spatial and...

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ISPRS Technical Commission I Midterm Symposium on Intelligent Sensing and Remote Sensing Application

作者： Shi, Yujun Su, Chengjie Yue, Tao Jiang, Lin Fan, Yajun Rong, Jing School of Civil Engineering Guangxi Polytechnic of Construction Guangxi Nanning530007 China Guangxi Key Laboratory of Spatial Information and Geomatics Guilin University of Technology Guangxi Guilin541004 China

The total amount of sugarcane planting in China ranks third in the world, and Guangxi is the largest sugarcane planting base in China. In order to help the Guangxi government and industry better understand the annual planting distribution and scale of sugarcane in the whole region, it is convenient to optimize the planting structure and improve the efficiency of resource utilization, so as to ensure the stable development of Guangxi sugar industry. Based on the satellite-based hyperspectral image data of ' Zhuhai No.1 ', this paper carries out sugarcane recognition and area extraction, which fills the application gap of satellite-based hyperspectral image data in extracting sugarcane area in China. A globally optimized extended random walk model was used to identify and extract sugarcane by combining the spatial-spectral information of hyperspectral imagery. Firstly, the Initial probability estimation is performed using the LOR classifier, and then use the data after MNF dimensionality reduction to construct a weighted graph, and finally the probability optimization and recognition are carried out based on the extended random walk model. The results show that the spatial-spectral joint method based on extended random walk can effectively identify sugarcane, and the sugarcane recognition accuracy of 2021 year image can reach 91.4 %, the misrecognition rate is 2.8%;the sugarcane recognition accuracy of 2020 year image can reach 90.5 %, the misrecognition rate is 3.1%. © Author(s) 2024.

关键词： Remote sensing

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Optimization of Mortar Compressive Strength Prepared with Waste Glass Aggregate and Coir Fiber Addition Using Response Surface Methodology

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Journal of Renewable Materials 2023年第10期11卷 3751-3767页

作者： Cut Rahmawati Lia Handayani Muhtadin Muhammad Faisal Muhammad Zardi S.M.Sapuan Agung Efriyo Hadi Jawad Ahmad Haytham F.Isleem Department of Civil Engineering Universitas AbulyatamaAceh Besar23372Indonesia Advanced Engineering Materials and Nano Technology Research Center Universitas AbulyatamaAceh Besar23372Indonesia Faculty of Fisheries Universitas AbulyatamaAceh Besar23372Indonesia Department of Mechanical Engineering Universitas AbulyatamaAceh Besar23372Indonesia Advanced Engineering Materials and Composites Research Center(AEMC) Department of Mechanical and Manufacturing EngineeringUniversiti Putra MalaysiaSelangor43400Malaysia Department of Mechanical Engineering Universitas MalahayatiLampung35153Indonesia Department of Civil Engineering Millitary College of EngineeringRisalpur24080Pakistan Department of Construction Management Qujing Normal UniversityQujing655011China

Waste Glass(WGs)and Coir Fiber(CF)are not widely utilized,even though their silica and cellulose content can be used to create construction *** study aimed to optimize mortar compressive strength using Response Surface Methodology(RSM).The Central Composite Design(CCD)was applied to determine the optimization of WGs and CF addition to the mortar compressive *** strength and microstructure testing with Scanning Electron Microscope(SEM),Fourier-transform Infrared Spectroscopy(FT-IR),and X-Ray Diffraction(XRD)were conducted to specify the mechanical ability and bonding between the matrix,CF,and *** results showed that the chemical treatment of CF produced 49.15%cellulose,with an average particle size of 1521μ*** regression of a second-order polynomial model yielded an optimum composition consisting of 12.776%WGs and 2.344%CF with a predicted compressive strength of 19.1023 MPa.C-S-H gels were identified in the mortars due to the dissolving of SiO_(2) in WGs and *** silica from WGs increased the C-S-H *** plays a role in preventing,bridging,and branching micro-cracks before reaching maximum *** aggregates and chemically treated CF are suitable to be composited in mortar to increase compressive strength.

关键词： Cellulose response surface methodology waste glass coir fiber composite

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Experimental study on frost resistance of hybrid fiber fly ash concrete

Experimental study on frost resistance of hybrid fiber fly a...

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作者： Zhang, Jingshuang Wu, Yanqing Ren, Bin Engineering Research Center of Underground Mine Construction Ministry of Education Anhui University of Science and Technology Anhui Huainan232001 China School of Civil Engineering and Architecture Anhui University of Science and Technology Anhui Huainan232001 China

Based on the orthogonal test, the optimized ratio of hybrid fiber fly ash concrete prepared with different volume admixtures of polypropylene fiber and polyacrylonitrile fiber, and different lengths, was obtained, and its frost resistance was evaluated in terms of mass change, dynamic elastic modulus, compressive strength, and splitting tensile strength before and after water and salt freezing. Then, the damage mechanism was discussed by combining the pore structure and SEM analysis. The results show that the tensile strength and relative dynamic elastic modulus of specimens after the water freezing cycle are better than those after the salt freezing cycle with the same number of freeze-thaw cycles, and the mass loss rate is less than that of the salt freezing cycle;the compressive strength and the splitting tensile strength of hybrid fiber fly ash concrete increased by 8.5% and 9.5%, and 46.8% and 12.1%, respectively, after 60 times of water freezing and salt freezing cycles compared with the benchmark fly ash concrete. As the number of freeze-thaw cycles increased, the pore air content and the frequency of large pores increased and the frequency of small pores decreased;in terms of the pore distribution of concrete, the distribution of pore structure was more reasonable for water freeze cycle relative to salt freeze cycle and for hybrid fiber fly ash concrete relative to the base fly ash concrete. Thus, it can be found that hybrid fibers incorporated into concrete can reduce the damage to the concrete interior by the freeze-thaw cycle and significantly improve the frost resistance of concrete. © 2023 Author(s).

关键词： Frost resistance

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Fluctuation of Near-Wall Pressure During the Cavitation Bubble Collapse 8th

Fluctuation of Near-Wall Pressure During the Cavitation Bubb...

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8th International Conference on Advances in construction Machinery and Vehicle engineering, ICACMVE 2023

作者： Yuan, Zhicheng Li, Haowen Yang, Meng Bian, Yongming Chen, Li School of Mechanical Engineering Tongji University Shanghai201804 China National Engineering Technology Research Center for Prefabrication Construction in Civil Engineering Tongji University Shanghai200092 China School of Automotive Engineering Tongji University Shanghai201804 China School of Mechanical and Automotive Engineering Zhejiang University of Water Resources and Electric Power Zhejiang Hangzhou310018 China

ISBN: (纸本)9789819718757

Cavitation bubble collapse, which generates strong shock waves and high-velocity liquid jets, is responsible for the erosive damage to hydraulic components. In order to assess the fluctuation of near-wall pressure, in this work, an open-source package OpenFOAM is utilized for solving the Navier–Stokes equation. To track the liquid–air interface, the volume of fluid (VoF) method-based compressibleInterFoam solver is selected, and its shipped dynamic contact angle model is modified to obtain better accuracy when considering the wettability of substrates. Numerical methods are first validated by comparing with experiment, and then it is extended to study the effect of bubble diameter, pressure difference, and surface wettability on the fluctuation of near-wall pressure. Simulation results show that the initial sphere bubble goes through three stages of growth, shrinkage, and collapse near the wall. A larger bubble size leads to higher impact pressure due to the higher speed of the liquid jet. The difference in initial pressure in and out of the bubble has a great effect on the collapse behaviour. In addition, a hydrophobic surface, meaning hard liquid pining, can speed up the damping of near wall pressure. The findings in this work will be a guide to designing hydraulic components for limiting the erosive damages of cavitation bubble collapse. © The Author(s) 2024.

关键词： Navier Stokes equations

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