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Model tests and numerical analysis of emergency treatment of co.esionless soil landslide with quick-setting polyurethane

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Journal of Mountain Science 2025年第1期22卷 110-121页

作者： ZHANG Zhichao TANG Xuefeng HUANG Rufa CAI Zhenjie GAO Anhua Key Laboratory of Geohazard Prevention of Hilly Mountains Ministry of Natural Resources of ChinaFuzhou 350002China Technology Innovation Center for Monitoring and Restoration Engineering of Eco.ogical Fragile Zone in Southeast China Ministry of Natural ResourcesFuzhou 350001China Fujian construction Research Engineering co.sulting co. Ltd.Fuzhou 350100China Xin Zhongkun construction Engineering co. LTDLongyan 364399China Fujian Jiakang construction Engineering co. LTDLongyan 364199China

Shotcrete is one of the co.mon solutions for shallow *** works by forming a protective layer with high strength and cementing the loose soil particles on the slope surface to prevent shallow ***,the solidification time of co.ventional cement paste is long when shotcrete is used to treat co.esionless soil *** idea of reinforcing slope with polyurethane solidified soil(i.e.,mixture of polyurethane and sand)was *** tests and finite element analysis were carried out to study the effectiveness of the proposed new method on the emergency treatment of co.esionless soil *** loading on the crest of the slope was applied step by step until landslide was triggered so as to test and co.pare the stability and bearing capacity of slope models with different *** simulated slope displacements were relatively close to the measured results,and the simulated slope deformation characteristics were in good agreement with the observed phenomena,which verifies the accuracy of the numerical *** the co.dition of surcharge loading on the crest of the slope,the unreinforced slope slid when the surcharge loading exceeded 30 k Pa,which presented a failure mode of local instability and co.lapse at the shallow layer of slope *** reinforced slope remained stable even when the surcharge loading reached 48 k *** displacement of the reinforced slope was reduced by more than 95%.Overall,this study verifies the effectiveness of polyurethane in the emergency treatment of co.esionless soil landslide and should have broad application prospects in the field of geological disasters co.cerning the safety of people's live.

关键词： co.esionless soil landslide Polyurethane Emergency treatment Reinforcement effect Model test Finite element analysis

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construction Monitoring and Analysis of Asymmetric Prestressed co.crete 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

co.plex bridge structures designed and co.structed 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 co.crete(PC)variable-section co.tinuous 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 co.pleted 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 co.pressive 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： co.tinuous girder bridge construction monitoring bridge alignment stress monitoring

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Short-Term Photovoltaic Power Prediction Based onMulti-Stage Temporal Feature Learning

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Energy Engineering 2025年第2期122卷 747-764页

作者： Qiang Wang Hao Cheng Wenrui Zhang Guangxi Li Fan Xu Dianhao Chen Haixiang Zang Jiangsu Qitian Power construction Group co. Ltd.Lianyungang222000China Lianyungang Zhiyuan Electricity Design co. Ltd.Lianyungang222000China Lianyungang Power Supply co.pany State Grid Jiangsu Electric Power Co.Ltd.Lianyungang222000China School of Electrical and Power Engineering Hohai UniversityNanjing210098China

Harnessing solar power is essential for addressing the dual challenges of global warming and the depletion of traditional energy ***,the fluctuations and intermittency of photovoltaic(PV)power pose challenges for its extensive inco.poration into power ***,enhancing the precision of PV power prediction is particularly *** existing studies have made progress in short-term prediction,issues persist,particularly in the underutilization of temporal features and the neglect of co.relations between satellite cloud images and PV power *** factors hinder improvements in PV power prediction *** overco.e these challenges,this paper proposes a novel PV power prediction method based on multi-stage temporal feature ***,the improved LSTMand SA-co.vLSTMare employed to extract the temporal feature of PV power and the spatial-temporal feature of satellite cloud images,***,a novel hybrid attention mechanism is proposed to identify the interplay between the two modalities,enhancing the capacity to focus on the most relevant ***,theTransformermodel is applied to further capture the short-termtemporal patterns and long-term dependencies within multi-modal feature *** paper also co.pares the proposed method with various co.petitive *** experimental results demonstrate that the proposed method outperforms the co.petitive methods in terms of accuracy and reliability in short-term PV power prediction.

关键词： Photovoltaic power prediction satellite cloud image LSTM-Transformer attention mechanism

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Bioenergy reco.ery and carbon emissions benefits of short-term bio-thermophilic pretreatment on low organic sewage sludge anaerobic digestion:A pilot-scale study

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Journal of Environmental Sciences 2025年第2期148卷 321-335页

作者： Hui Wang Xiang Fu Haozhe Huang Danni Shen Dongdong Fan Liming Zhu Xiaohu Dai Bin Dong co.lege of Environmental Science and Engineering Tongji UniversityShanghai 200092China Yangtze Eco.Environment Engineering Research Center China Three Gorges CorporationBeijing 100038China Yangtze River Eco.Environmental Engineering Research Center Shanghai InvestigationDesign and Research Institute Co.LTDShanghai 200092China China construction Third Engineering Bureau First Engineering co. Ltd.Wuhan 430000China

Sewage sludge in cities of Yangzi River Belt,China,generally exhibits a lower organic co.tent and higher silt co.tentdue to leakage of drainage system,which caused low bioenergy reco.ery and carbon emission benefits in co.ventional anaerobic digestion(CAD).Therefore,this paper is on a pilot scale,a bio-thermophilic pretreatment anaerobic digestion(BTPAD)for low organic sludge(volatile solids(VS)of 4%)was operated with a long-term co.tinuous flow of 200 *** VS degradation rate and CH_(4) yield of BTPAD increased by 19.93%and 53.33%,respectively,co.pared to those of *** analysis of organic co.positions in sludge revealed that BTPAD mainly improved the hydrolysis of proteins in *** analysis of microbial co.munity proportions by high-throughput sequencing revealed that the short-term bio-thermophilic pretreatment was enriched in Clostridiales,co.rothermobacter and Gelria,was capable of hydrolyzing acidified proteins,and provided more volatile fatty acid(VFA)for the subsequent *** co.bined with fluorescence quantitative polymerase chain reaction(PCR)analysis showed that the number of bacteria with high methanogenic capacity in BTPAD was much higher than that in CAD during the medium temperature digestion stage,indicating that short-term bio-thermophilic pretreatment co.ld provide better methanogenic co.ditions for ***,the greenhouse gas emission footprint analysis showed that short-term bio-thermophilic pretreatment co.ld reduce the carbon emission of sludge anaerobic digestion system by 19.18%.

关键词： Sludge Anaerobic digestion Bio-thermophilic pretreatment Pilot scale Molecular microbiology Carbon emissions

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How do Notch Shape and Boundary co.ditions Affect the Hydro-Mechanical Behavior of Fractured Geomaterials?Findings via the Darcy-Brinkman-Biot Approach

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Journal of Earth Science 2025年第1期36卷 351-356页

作者： Yi-Xiang Wang Xiao-Pei Guo Ling Xu Shi-Feng Lu Department of Civil Engineering School of Human Settlements and Civil EngineeringXi'an Jiaotong UniversityXi'an 710049China China construction Eighth Engineering Division co. Ltd.Southwest BranchChengdu 610041China

0 INTRODUCTION Natural geomaterials,including soils and rocks,are invariably exposed to intricate stress co.ditions,in addition to water pressure,in various engineering co.texts such as foundation treatment,mining,and *** geomaterials frequently co.tain numerous fractures,which significantly influence hydrological dynamics as water permeates through them,leading to processes like expansion and bifurcation(Shu et al.,2023;Tran and Jha,2021;Lei et al.,2017;Wang et al.,2015).

关键词： bifurcation invar mining

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A Deep Learning Estimation Method for Temperature-Induced Girder End Displacements of Suspension Bridges

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Structural Durability & Health Monitoring 2025年第2期19卷 307-325页

作者： Yao Jin Yuan Ren Chong-Yuan Guo Chong Li Zhao-Yuan Guo Xiang Xu School of Transportation Southeast UniversityNanjing210096China Department of Engineering Guangzhou Expressway Operation Management Co.Ltd.Guangzhou510000China Department of Engineering CCCC Highway Bridge National Engineering Research Center Co.Ltd.Beijing100088China Department of Engineering Jiangsu Provincial Transportation Engineering Construction BureauNanjing210004China

To improve the accuracy of thermal response estimation and overco.e the limitations of the linear regression model and Artificial Neural Network(ANN)model,this study introduces a deep learning estimation method specifically based on the Long Short-Term Memory(LSTM)network,to predict temperature-induced girder end displacements of the Dasha Waterway Bridge,a suspension bridge in ***,to enhance data quality and select target sensors,preprocessing based on the sigma rule and nearest neighbor interpolation is applied to the raw ***,to eliminate the high-frequency co.ponents from the displacement signal,the wavelet transform is ***,the linear regression model and ANN model are established,whose results do not meet the requirements and fail to address the time lag effect between temperature and *** study proceeds to develop the LSTM network model and determine the optimal parameters through hyperparameter sensitivity ***,the results of the LSTM network model are discussed by a co.parative analysis against the linear regression model and ANN model,which indicates a higher accuracy in predicting temperatureinduced girder end displacements and the ability to mitigate the time-lag *** be more specific,in co.parison between the linear regression model and LSTM network,the mean square error decreases from 6.5937 to 1.6808 and R2 increases from 0.683 to 0.930,which co.responds to a 74.51%decrease in MSE and a 36.14%improvement in *** to ANN,with an MSE of 4.6371 and an R2 of 0.807,LSTM shows a decrease in MSE of 63.75%and an increase in R2 of 13.23%,demonstrating a significant enhancement in predictive performance.

关键词： Suspension bridges thermal response girder end displacement deep learning

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Experimental Study and a Modified Model for Temperature-Reco.ery Stress of Shape Memory Alloy Wire under Different Temperatures

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Structural Durability & Health Monitoring 2025年第2期19卷 347-364页

作者： Zhi-Xiang Wei Wen-Wei Wang Yan-Jie Xue Wu-Tong ZhangQiu-Di Huang Guangxi Lepu Expressway co. Ltd.Nanning530000China Department of Bridge Engineering School of TransportationSoutheast UniversityNanjing211189China Department of Road and Bridge Engineering College of Construction EngineeringJilin UniversityChangchun130012China

To investigate the performance of utilizing the shape memory effect of SMA(Shape Memory Alloy)wire to generate reco.ery stress,this paper performed single heating reco.ery stress tests and reciprocating heating-co.ling reco.ery stress tests on SMA wire under varying initial strain *** effects of various strains and different energized heating methods on the reco.ery stress of SMA wires were explored in the single heating *** SMA wire was strained from 2%to 8%initially,and two distinct heating approaches were employed:one using a large current interval for rapid heating and one using a small current interval for slower *** experimental outco.es reveal that during a single heating cycle,the temperature-reco.ery stress relationship of SMA wire exhibits three distinct stages:the martensite phase stage,the transition stage from martensite to austenite phase,and the austenite phase ***,the choice of heating method does not influence the maximum reco.ery stress value,and the co.relation between initial strain and maximum reco.ery stress is predominantly ***,co.ducting the reciprocating temperature rise and fall performance test is important to better simulate the scenario in practical engineering where multiple reco.ery stress in SMA wires for structural *** this test,two temperature cycling methods were studied:interval rise and fall,as well as direct rise and *** the case of utilizing the interval temperature rise and fall method,it was observed that the reco.ery stress associated with co.ling was significantly higher than that co.responding to heating at the same ***,the reco.ery stress was lower upon subsequent heating than that measured during the previous heating *** on the experimental results,a prediction model for the temperature-reco.ery stress relationship has been proposed to simplify numerical *** is hoped that an approximate temperaturereco.ery stress curve can be

关键词： SMA wire temperature reco.ery stress modified model phase transition

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Vibration safety assessment and parameter analysis of buried oil pipelines based on vibration isolation holes under strong surface impact

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 69-82页

作者： Wang Guobo Mei Hua Wang Jianning He Wei Yin Yao Zhai Yuxin Zuo Pengfei co.lege of Civil Engineering and Architecture Wenzhou UniversityWenzhou 325035China Zhejiang Engineering Research Center of Disaster Prevention and Mitigation for co.stal Soft Soil Foundation WenZhou 325035China China National Machinery Industry co. Ltd.Beijing 100080China Faculty of Engineering China University of GeosciencesWuhan 430074China China Railway construction Group co. Ltd.Beijing 100072China School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China

Strong surface impact will produce strong vibration,which will pose a threat to the safety of nearby buried pipelines and other important lifeline *** on the verified numerical method,a co.prehensive numerical parameter analysis is co.ducted on the key influencing factors of the vibration isolation hole(VIH),which include hole diameter,hole net spacing,hole depth,hole number,hole arrangement,and soil *** results indicate that a smaller ratio of net spacing to hole diameter,the deeper the hole,the multi-row hole,the hole adoption of staggered arrangements,and better site soil co.ditions can enhance the efficiency of the VIH *** average maximum vibration reduction efficiency within the vibration isolation area can reach 42.2%.The vibration safety of adjacent oil pipelines during a dynamic co.paction projection was evaluated acco.ding to existing standards,and the measurement of the VIH was reco.mended to reduce excessive *** single-row vibration isolation scheme and three-row staggered arrangement with the same hole parameters are suggested acco.ding to different *** research findings can serve as a reference for the vibration safety analysis,assessment,and co.trol of adjacent underground facilities under the influence of strong surface impact loads.

关键词： vibration isolation hole buried oil pipeline strong surface impact vibration velocity vibration safety assessment

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Anisotropy characterization of upper shanghai clays: Shear strength and small-strain stiffness

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Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 493-508页

作者： Lixin Lan Wenxuan Zhu Guanlin Ye Qi Zhang Tongshuai Yang Department of Civil Engineering State Key Laboratory of Ocean EngineeringShanghai Key Laboratory for Digital Maintenance of Buildings and InfrastructureShanghai Jiao Tong UniversityShanghai200240China Department of Civil Engineering Shanghai Jiao Tong UniversityShanghai200240China The Fourth construction co. Ltd.of China Construction Eighth Engineering DivisionQingdao266100China

co.prehensive investigations have been co.ducted to study the structure and overco.solidation of upper Shanghai clays, i.e. Layers 2–6 clays, typically located at depths of 30–40 m. However, limited information is available on their anisotropy, and even less is known about the co.relation between structure, overco.solidation, and anisotropy. In this study, the undrained anisotropy characteristics of shear strength and small-strain shear stiffness in upper Shanghai Layers 2–6 clays were thoroughly assessed using a series of K0-co.solidated undrained triaxial co.pression (TC) and triaxial extension (TE) tests (K0 is the co.fficient of lateral earth pressure at rest). The effective stress paths, shear strength, and small-strain shear stiffness from the undrained TC and TE tests demonstrate the anisotropic behaviors in upper Shanghai clays. Analyses of data from upper Shanghai clays and other clays worldwide indicate that the shear strength anisotropy ratio (Ks) co.verges at 0.8 as the overco.solidation ratio (OCR) and plasticity index (Ip) increase, while the small-strain shear stiffness anisotropy ratio (Re) co.verges at 1.0. The influence of OCR on Ks and Re is more pronounced than that of Ip and sensitivity (St). Nevertheless, no clear co.relation between Ks and Re is observed in upper Shanghai clays.

关键词： Shanghai clays Anisotropy Shear strength Small-strain stiffness

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Influence of ultrafine cement on cement-soil in peat soil environment of Dianchi Lake

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土木与环境工程学报(中英文) 2025年第2期47卷 1-12页

作者： CAO Jing SUN Huafeng HUANG Siyang KONG Cheng LIU Fangyi LIU Fuhua TIAN Lin ZHU Weiming Faculty of Civil Engineering and Mechanics Kunming University of Science and TechnologyKunming 650500P.R.China China Power construction Group Kunming Survey Design&Research Institute co. LtdKunming 650500P.R.China Zhejiang Wanning Technology co. LtdHangzhou 310000P.R.China

Treatment of peat soil foundation in Yunnan surrounding Dianchi and Erhai Lakes poses co.plex problems for engineering *** is insufficient to rely on ordinary cement to reinforce peat *** order to make the reinforcement reliable,this experiment mixed(ultrafine cement)UFC into ordinary cement to form a co.posite solidify *** study aimed to analyze the influence of UFC proportion on the strength of cement-soil in the peat soil *** co.pressive strength(UCS)and scanning electron microsco.e(SEM)tests were co.ducted on samples soaked for 28 and 90 days,*** test results show that without co.sidering the effects of Humic Acid(HA)and Fulvic Acid(FA),inco.porating UFC can significantly improve the UCS of *** rapid hydration of the fine particles generates a large number of cementitious products,improves the co.esion of the soil skeleton,and fills the ***,when the proportion of UFC increases,the aggregate structure formed by a larger quantity of fine particles reduces the hydration rate and degree of cement hydration,making the UCS growth rate of cement-soil *** the peat soil environment,HA significantly weakened the UCS of cement-soil in both physical and chemical ***,UFC can mitigate the adverse effect of HA on cement-soil by its small particle size,high surface energy,and solid binding *** addition,FA has a positive effect on the UCS of cement-soil soaked for 28 days and 90 *** UFC addition co.ld promote the enhancement effect of FA on cement-soil *** test results showed that cement hydration products increased significantly with the increase of UFC proportion,and cementation between hydration products and soil particles was *** size and co.nectivity of cement-soil pores were significantly reduced,thereby improving cement-soil structural integrity.

关键词： peat soil environment ultrafine cement(UFC) cement-soil strength test microstructure

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