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Mechanical behavior and damage co.stitutive model of sandstone under hydro-mechanical (H-M) co.pling

International Journal of Mining Science and Technology 2024年第6期34卷 837-853页

作者： Tao Tan Chunyang Zhang Yanlin Zhao Xiaoshuang Li School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Safety and Health in Metal Mines Maanshan 243000China Sinosteel Maanshan General institute of Mining research co. Ltd.Maanshan 243000China School of Resource&Environment and Safety Engineering Hunan University of Science and TechnologyXiangtan 411201China School of Urban construction Changzhou UniversityChangzhouJiangsu 213164China

Underground engineering often passes through water-rich fractured rock masses,which are prone to fracture and instability under the long-term co.pling of in-situ stress field and pore water(P-W)pressure,ultimately threatening the stability of underground *** order to explore the mechanical properties of rocks under H-M co.pling,the co.responding damage co.stitutive(D-C)model has beco.e the focus of *** the inadequacy of the current research on rock strength parameters,energy evolution characteristics and D-C model under H-M co.pling,the mechanical properties of typical sandstone samples are discussed based on laboratory *** results show that the variation of characteristic stresses of sandstone under H-M co.pling co.forms to the normalized attenuation equation and Mohr-co.lomb(MC)*** P-W pressure mechanism of sandstone exhibits a dynamic change from softening effect to H-M fracturing *** closure stress is mainly provided by co.esive strength,while the initiation stress,damage stress,and peak stress are jointly dominated by co.esive strength and friction *** addition,residual stress is attributed to the friction strength formed by the bite of the fracture ***,the energy evolution characteristics of sandstone under H-M co.pling were studied,and it was found that P-W pressure weakened the energy storage capacity and energy dissipation capacity of sandstone,and H-M fracturing was an important factor in reducing its energy storage ***,co.bined with energy dissipation theory and statistical damage theory,two types of D-C models co.sidering P-W pressure are proposed acco.dingly,and the model parameters can be determined by four *** application results indicate that the proposed and modified D-C models have high reliability,and can characterize the mechanical behavior of sandstone under H-M co.pling,overco.e the inco.venience of existing D-C models due to excessive mechanical

关键词： H-M co.pling Water-saturated sandstone Mechanical mechanism Energy evolution D-C model

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Modelling the water diversion of a sustainable co.er system under humid climates

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2429-2440页

作者： Haowen Guo Charles Wang Wai Ng Qi Zhang Chuanxiang Qu Liwen Hu Shenzhen research institute of Hong Kong University of Science and Technology Shenzhen518057China Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong SAR999077China CCCC Fourth Harbor Engineering institute co. LtdGuangzhou510230China

Extreme rainfall significantly threatens the safety of the landfill co.er system,especially under humid *** study aims to provide design reco.mendations for a sustainable landfill co.er system co.sisting of a low-permeability soil layer underlying a two-layer capillary barrier for humid ***,the numerical back-analysis was co.ducted for verification against a series of flume model ***,a parametric study was performed to investigate the effects of inclination angle,particle size and layer thickness on the lateral diversion length(DL)of the three-layer co.er system under the 100-year return period rainfall of humid *** results show that the water lateral DL of the co.er system can be greatly enhanced by increasing the inclination angle from 3to 18.Moreover,the bottom layer of the co.er system with a co.rser d10 was more susceptible to the impact of the heavy rainfall,while this can be alleviated by increasing the thickness of the bottom layer.A dimensionless number,defined as the ratio of thickness and d10 of the bottom layer,is proposed for designing lateral diversion of the three-layer co.er system under humid *** preserve the maximum DL,it is suggested that the proposed dimensionless number should be larger than 95 and 110 for the design of rainfall events with 50-year and 100-year return periods for humid climates,respectively.

关键词： Unsaturated soil Recycling construction waste Three-layer landfill co.er Water infiltration

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Finite Element Simulations of the Localized Failure and Fracture Propagation in co.esive Materials with Friction

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co.puter Modeling in Engineering & Sciences 2024年第7期140卷 997-1015页

作者： Chengbao Hu Shilin Gong Bin Chen Zhongling Zong Xingwang Bao Xiaojian Ru Department of Civil Engineering Hangzhou City UniversityHangzhou310015China Zhejiang Engineering research Center of Intelligent Urban Infrastructure Hangzhou310015China Key Laboratory of Safe construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province Hangzhou310015China School of Civil and Ocean Engineering Jiangsu Ocean UniversityLianyungang222005China institute of Municipal Engineering Hangzhou Shangcheng District Municipal Engineering Group Co.Ltd.Hangzhou310016China

Strain localization frequently occurs in co.esive materials with friction(e.g.,co.posites,soils,rocks)and is widely reco.nized as a fundamental cause of progressive structural ***,achieving high-fidelity simulation for this issue,particularly co.cerning strong disco.tinuities and tension-co.pression-shear behaviors within localized zones,remains significantly *** response,this study introduces an integrated algorithmwithin the finite element framework,merging a co.pled co.esive zone model(CZM)with the nonlinear augmented finite elementmethod(N-AFEM).The co.pledCZMco.prehensively describes tension-co.pression and co.pressionshear failure behaviors in co.esive,frictional materials,while the N-AFEM allows nonlinear co.pled intraelement disco.tinuities without necessitating extra nodes or nodal *** CZM validation using existing experimental data,this integrated algorithm was utilized to analyze soil slope failure mechanisms involving a specific tensile strength and to assess the impact of mechanical parameters(e.g.,tensile strength,weighting factor,modulus)in soils.

关键词： FEM analysis strong disco.tinuity nonlinear soil rupture co.esive zone model tension-co.pression-shear co.pling

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Vision-based survey method for extraordinary loads on buildings

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 815-831页

作者： Yang LI Jun CHEN Pengcheng WANG co.lege of Civil Engineering Tongji UniversityShanghai 200092Chinab China United Engineering co.Ltd. Hangzhou 310052China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China Shanghai Key Laboratory of Engineering Structure Safety Shanghai Research Institute of Building Sciences Co.Ltd.Shanghai 200032China

The statistical modeling of extraordinary loads on buildings has been stagnant for decades due to the laborious and error-prone nature of existing survey methods,such as questionnaires and verbal *** study proposes a new vision-based survey method for co.lecting extraordinary load data by automatically analyzing surveillance *** this purpose,a crowd head tracking framework is developed that integrates crowd head detection and reidentification models based on co.volutional neural networks to obtain head trajectories of the crowd in the survey *** crowd head trajectories are then analyzed to extract crowd quantity and velocities,which are the essential factors for extraordinary *** survey areas with frequent crowd movements during temporary events,the equivalent dynamic load factor can be further estimated using crowd velocity to co.sider dynamic effects.A crowd quantity investigation experiment and a crowd walking experiment are co.ducted to validate the proposed survey *** experimental results prove that the proposed survey method is effective and accurate in co.lecting load data and reasonable in co.sidering dynamic effects during extraordinary *** proposed survey method is easy to deploy and has the potential to co.lect substantial and reliable extraordinary load data for determining design load on buildings.

关键词： load survey extraordinary load live load object detection multiple-object tracking

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A telomere-to-telomere genome assembly of Hongyingzi,a sorghum cultivar used for Chinese Baijiu production

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The Crop Journal 2024年第2期12卷 635-640页

作者： Yanqing Ding Yilin Wang Jianxia Xu Feng Jiang Wenzhen Li Qiaoling Zhang Longping Yang Zhenyu Zhao Bin Cheng Ning Cao Xu Gao Xin Zhang Guihua Zou Fan Yang Liyi Zhang Guizhou institute of Upland Crops Guizhou Academy of Agricultural SciencesGuiyang 550006GuizhouChina Kweichow Moutai co. Ltd.Maotai TownRenhuai 564501GuizhouChina Kweichow Moutai Distillery(Group)Hongyingzi Agricultural Technology Development co. Ltd.Maotai TownRenhuai 564501GuizhouChina Wuhan GrandOmics Biosciences co. Ltd.Grandomics BiosciencesWuhan 430000HubeiChina institute of Crop and Nuclear Technology Utilization Zhejiang Academy of Agricultural SciencesZhejiang

Sorghum(Sorghum bico.or(L.)Moench)is a world cereal crop used in China for producing Baijiu,a distilled *** report a telomere-to-telomere genome assembly of the Baijiu cultivar Hongyingzi,HYZ-T2T,using ultralong *** 10 chromosome pairs co.tained 33,462 genes,of which 93%were functionally *** 20 telomeres and 10 centromeric regions on the HYZ-T2T chromosomes were predicted and two co.secutive large inversions on chromosome 2 were characterized.A 65-gene reconstruction of the metabolic pathway of tannins,the flavor substances in Baijiu,was performed and may advance the breeding of sorghum cultivars for Baijiu production.

关键词： Sorghum Telomere-to-telomere assembly Hongyingzi(HYZ) Chinese Baijiu-making cultivar

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Polyoxometalates-derived nanostructures for electrocatalysis application

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Rare Metals 2024年第5期43卷 1845-1866页

作者： Chao-Yue Sun Wen Li Kai Wang Wei-Jia Zhou Hai-Qing Wang institute for Advanced Interdisciplinary research(iAIR) College of Chemistry and Chemical EngineeringUniversity of JinanJinan250022China Shandong Electrical Engineering and Equipment Group Intelligent Electric co. Ltd.Jinan 250022China

The co.version of intermittent renewable electrical energy to chemical energy is of great importance which can not only mitigate current energy and environmental crisis but also co.tribute to the ongoing carbon neutrality national *** is serving as a low-carbon co.version technology that enables green and efficient energy co.version mainly through hydrogen evolution reaction(HER),carbon dioxide reduction reaction(co.(2)RR),and nitrogen reduction reaction(NRR).The co.e of electrocatalysis is the design and construction of low-co.t high-activity and high-stability electrocatalyst to drive reaction thermodynamics and *** employment of polyoxometalates(POMs)as platforms or precursors to co.struct different types of electrocatalysts has been widely ***,we systematically summarized the recent advances in POM-derived nanostructures for electrocatalysis *** strategies for precursor design and electrocatalyst synthesis were briefly *** morphology co.trol,phase co.trol,co.posite modulation,and heterostructure engineering in POM-derived nanostructures were presented in *** structure–activity relationship of POM-derived nanostructures is fully discussed for HER co.(2)RR,and NRR ***,the current challenges and future outlooks of POM-derived nanostructures are summarized to provide insights toward high-efficiency electrocatalysts for energy co.version technologies.

关键词： Microforming Cylindrical co.pression Size effects Grain orientation Inhomogeneous deformation

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A method for support stiffness failure identification in a steel spring floating slab track of urban railway: a case study in China

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第3期25卷 206-222页

作者： Junyuan ZHENG Caiyou ZHAO Duojia SHI Ping WANG Jian WANG Bolong JIANG Xi SHENG Key Laboratoryof High-speed Railway Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 60031China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China 01 DYNA(Qingdao)Test&Data co. Ltd.Qingdao 266000China Rail Transit Digital construction and Measurement Technology National Engineering research Center China Railway Design CorporationTianjin300308China institute of Urban Smart Transportation&Safety Maintenance Shenzhen UniversityShenzhen 518060China

The extensive use of steel spring floating slab tracks has effectively addressed the challenge of alleviating the environmental vibrations induced by urban rail transit ***,under the co.bined action of train dynamic loads and co.plex environmental factors,problems,such as the fracture of steel spring vibration isolators and suspension vibrations induced by the uneven settlement of the base,often *** failure of isolator support stiffness is often hidden in its early stages and is challenging to identify by co.ventional detection *** the same time,it will aggravate the wheel-rail interaction,accelerate the deterioration of track structure,and even affect the driving *** study first establishes a detailed co.pled train-floating slab track-foundation analytical *** the influence of the vibration isolator support stiffness failure on the dynamic indices of the floating slab track system response is analyzed.A set of defect identification methods that can detect the number of failed steel springs,severity of damage,and their location is ***,an intelligent monitoring system for support stiffness of floating slab track is built by co.bining the density-based spatial clustering of applications with noise algorithm and statistical data analysis and is applied to a rail line in southern *** a three-year monitoring campaign,a suspension failure and a fracture of a steel spring were each successfully detected and detailed failure information was *** investigation results were co.sistent with the damage identification *** repair,the track structure dynamic response returned to the average pre-damage level and further deterioration had been *** proposed damage identification methods and monitoring system provide an approach for intelligent identification of track structure support stiffness failures.

关键词： Floating slab track Support stiffness Detailed analytical model Failure identification Monitoring system

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POX1 regulates the formation of viable but non-culturable brewer’s yeast induced by iso-alpha acid from hops

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Food Science and Human Wellness 2024年

作者： Zengyan Wang Yang Xiao Xuchen Li Zhenqing Li Yan Wang Wei He Jiayang Wang Li Liu Ting Ding Pengdong Sun Jingyuan Li Yang Deng Shandong Technology Innovation Center of Special Food 4. Qingdao Special Food research institute Key Laboratory of Special Food Processing (co.construction by Ministry and Province) Ministry of Agriculture Rural Affairs Qingdao Agricultural University School of Food Engineering Qingdao institute of Technology co.lege of Food Science and Engineering Qingdao Agricultural University Shandong Huifa Foodstuff co. Ltd.

In this study， we utilized gene knockout and overexpression techniques to generate brewer’s yeast strains with either a deletion or overexpression of the POX1 gene. The strains studied included the parental strain， the POX1 deletion strain， and the POX1 overexpression strain. These strains were exposed to iso-alpha acid from hops at a co.centration of 300 mg/L， leading to the induction of a viable but non-culturable (VBNC) state. Our results indicated that the silencing of the POX1 gene rendered brewer’s yeast cells unable to withstand the high co.centration of iso-alpha acid stress， ultimately leading to cell death. co.versely， the overexpression of POX1 accelerated the transition of yeast cells into the VBNC state co.pared to the parental strain. Furthermore， we evaluated the levels of reactive oxygen species (ROS)， catalase (CAT) activity， superoxide dismutase (SOD) activity， glutathione reductase (GR) activity， and the mRNA expression of genes that regulate these enzymes (SYM1， CTA1， SOD1， and GLR1) in brewer’s yeast cells at three distinct stages: normal， short-term stress， and VBNC states. Based on these findings， it can be inferred that the formation of the VBNC state in brewer’s yeast is associated with the response to oxidative stress.

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Mechanical behavior and damage co.stitutive model of sandstone under hydro-mechanical(H-M) co.pling

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International Journal of Mining Science and Technology 2024年第06期 837-853页

作者： Tao Tan Chunyang Zhang Yanlin Zhao Xiaoshuang Li School of Resources and Environmental Engineering Wuhan University of Technology State Key Laboratory of Safety and Health in Metal Mines Sinosteel Maanshan General institute of Mining research co. Ltd. School of Resource & Environment and Safety Engineering Hunan University of Science and Technology School of Urban construction Changzhou University

Underground engineering often passes through water-rich fractured rock masses, which are prone to fracture and instability under the long-term co.pling of in-situ stress field and pore water(P-W) pressure, ultimately threatening the stability of underground structures. In order to explore the mechanical properties of rocks under H-M co.pling, the co.responding damage co.stitutive(D-C) model has beco.e the focus of attention. co.sidering the inadequacy of the current research on rock strength parameters,energy evolution characteristics and D-C model under H-M co.pling, the mechanical properties of typical sandstone samples are discussed based on laboratory tests. The results show that the variation of characteristic stresses of sandstone under H-M co.pling co.forms to the normalized attenuation equation and Mohr-co.lomb(M-C) criterion. The P-W pressure mechanism of sandstone exhibits a dynamic change from softening effect to H-M fracturing effect. The closure stress is mainly provided by co.esive strength, while the initiation stress, damage stress, and peak stress are jointly dominated by co.esive strength and friction strength. In addition, residual stress is attributed to the friction strength formed by the bite of the fracture surface. Subsequently, the energy evolution characteristics of sandstone under H-M co.pling were studied, and it was found that P-W pressure weakened the energy storage capacity and energy dissipation capacity of sandstone, and H-M fracturing was an important factor in reducing its energy storage efficiency. Finally, co.bined with energy dissipation theory and statistical damage theory, two types of D-C models co.sidering P-W pressure are proposed acco.dingly, and the model parameters can be determined by four methods. The application results indicate that the proposed and modified D-C models have high reliability, and can characterize the mechanical behavior of sandstone under H-M co.pling, overco.e the inco.venience of existing D-C models

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research on Quality Management Measures of Green building construction

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Journal of Architectural research and Development 2024年第3期8卷 8-13页

作者： Jie Hong Xiang Xu Zhongtian construction Group co. Ltd.Dongyang 322100Zhejiang ProvinceChina

Urbanization has led to the rapid development of the construction ***,this has also led to higher requirements for the construction engineering *** than the quality monitoring of engineering construction,the energy-saving properties of the building should also be ***,a scientific management approach should be adopted to improve green building *** paper primarily examines the importance of quality management in green building construction,along with the factors influencing *** also identifies the quality issues present in current green building ***,it proposes measures for quality management in the green building construction process to facilitate the industry’s healthy development.

关键词： Green building engineering construction process co.trol Quality management construction publicity

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