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Theory,technology and application of grouted bolting in soft rock roadways of deep coal mines

International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1463-1479页

作者： Hongpu Kang Jianwei Yang Pengfei Jiang Fuqiang Gao Wenzhou Li Jiafeng Li Huiyuan Chen coal Mining Research Institute China Coal Technology and Engineering Group Co.Ltd.Beijing 100013China coal Mining Branch China Coal Research InstituteBeijing 100013China State Key Laboratory of Intelligent Mining and Strata control Beijing 100013China

The grouted bolt,combining rock bolting with grouting techniques,provides an effective solution for controlling the surrounding rock in deep soft rock and fractured *** has been extensively applied in numerous deep mining areas characterized by soft rock roadways,where it has demonstrated remarkable control *** article systematically explores the evolution of grouted bolting,covering its theoretical foundations,design methods,materials,construction processes,monitoring measures,and methods for assessing its *** overview encompassed several key elements,delving into anchoring theory and grouting reinforcement *** new principle of high pretensioned high-pressure splitting grouted bolting collaborative active control is introduced.A fresh method for dynamic information design is also *** discussion touches on both conventional grouting rock bolts and cable bolts,as well as innovative grouted rock bolts and cables characterized by their high pretension,strength,and sealing hole *** examination of the merits and demerits of standard inorganic and organic grouting materials versus the new inorganic–organic composite materials,including their specific application conditions,was ***,the article presents various methods and instruments to assess the support effect of grouting rock bolts,cable bolts,and grouting ***,it provides a foundation for understanding the factors influencing decisions on grouted bolting timing,the sequence of grouting,the pressure applied,the volume of grout used,and the strategic arrangement of grouted rock bolts and cable *** application of the high pretensioned high-pressure splitting grouted bolting collaborative control technology in a typical kilometer-deep soft rock mine in China—the soft coal seam and soft rock roadway in the Kouzidong coal mine,Huainan coal mining area,was ***,the existing problems in grouted bolting control

关键词： deep coal mine soft rock roadway grouted bolting rock bolt and cable grouting material high-pressure splitting grouting collaborative control technology

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中国新材料科学技术的创新发展研究

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Engineering 2024年第1期32卷 10-13页

作者： Yong Gan China Iron and Steel Research Institute group co. Ltd.Beijing 100081China

New materials,which are also known internationally as"advanced materials,"refer to newly emerging materials with excellent performance and special functions or traditional materials with significantly improved performance or new functions after improvement and *** present,the multidisciplinary cooperation of information technology,biotechnology,new energy technology,and new materials technology is triggering a new round of scientific and technologicalrevolution and industrial transformation[1].

关键词：材料科学技术 performance functions

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From tunnel boring machine to tunnel boring robot: perspectives on intelligent shield machine and its smart operation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第5期25卷 357-381页

作者： Yakun ZHANG Guofang GONG Huayong YANG Jianbin LI Liujie JING State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310058China China Railway Engineering Equipment group co. Lid.Zhengzhou 450016China Maha Fluid Power Research Center Purdue UniversityWest LafayetteIN 47905USA

Advances in intelligent shield machines reflect an evolving trend from traditional tunnel boring machines(TBMs)to tunnel boring robots(TBRs).This shift aims to address the challenges encountered by the conventional shield machine industry arising from construction environment and manual *** study presents a systematic review of intelligent shield machine technology,with a particular emphasis on its smart ***,the definition,meaning,contents,and development modes of intelligent shield machines are *** development status of the intelligent shield machine and its smart operation are then *** analyzing the operation process of the shield machine,an autonomous operation framework considering both stand-alone and fleet levels is *** and recommendations are given for achieving autonomous *** study offers insights into the essence and developmental framework of intelligent shield machines to propel the advancement of this technology.

关键词： Intelligent shield machine Tunnel boring machine(TBM) Tunnel boring robot(TBR) Self-driving Autonomous control Shield machine

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Analysis of rotor eddy current loss and thermal deformation of magnetic liquid double suspension bearing

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High Technology Letters 2024年第3期30卷 322-332页

作者： LIU Hongmei YANG Guang SUN Yanan SUN Jian WANG Zhe ZHAO Jianhua Shijiazhuang Rail Transit group co.Ltd Shijiazhuang 050011P.R.China Shijiazhuang Haishan Industrial Development co.Ltd Shijiazhuang 050200P.R.China Fluid Power Transmission and control Laboratory Yanshan UniversityQinhuangdao 066004P.R.China

Magnetic-liquid double suspension bearing(MLDSB)is a new type of suspension bearing based on electromagnetic suspension and supplemented by hydrostatic *** affecting the electromagnetic suspension force,the hydrostatic supporting effect is increased,and the real-time coupling of magnetic and liquid supporting can be ***,due to the high rotation speed,the rotor part produces eddy current loss,resulting in a large temperature rise and large ther-mal deformation,which makes the oil film thickness deviate from the initial *** support and bearing characteristics are seriously ***,this paper intends to explore the internal effects of eddy current loss of the rotor on the temperature rise and thermal deformation of ***,the 2D magnetic flow coupling mathematical model of MLDSB is established,and the eddy current loss distribution characteristics of the rotor are numerically simulated by Maxwell ***,the internal influence of mapping relationship of structural operating parameters such as input current,coil turns and rotor speed on rotor eddy current loss is revealed,and the changing trend of rotor eddy current loss under different design parameters is ***,the eddy cur-rent loss is loaded into the heat transfer finite element calculation model as a heat source,and the temperature rise of the rotor and its thermal deformation are simulated and analyzed,and the influ-ence of eddy current loss on rotor temperature rise and thermal deformation is ***,the pressure-flow curve and the distribution law of the internal flow field are tested by the particle image velocimetry(PIV)*** results show that eddy current loss increases linearly with the in-crease of coil current,coil turns and rotor *** effect of rotational speed on eddy current loss is much higher than that of coil current and coil *** maximum temperature rise,minimum temperature rise and maximum thermal defo

关键词： magnetic-liquid double suspension bearing(MLDSB) oil film thickness cur-rent loss thermal deformation particle image velocimetry(PIV)test

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Arc and Droplet Behaviors in Horizontal Short-Arc Pulsed Gas Metal Arc Welding of 9%Ni Steel with ERNiCrMo-3 Welding Wire

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Journal of Shanghai Jiaotong university(Science) 2024年第2期29卷 361-376页

作者：刘轶玮华学明吴东升李芳蔡艳王欢杨修荣 Shanghai Key Laboratory of Material Laser Processing and Modification Shanghai Jiao Tong UniversityShanghai 200240China Hudong-Zhonghua Shipbuilding(group)co. Ltd.Shanghai 200129China Zhuhai cowin Welding Equipment&consumables co. Ltd.Zhuhai 519015GuangdongChina

Short-arc pulsed gas metal arc welding(P-GMAW)was used to solve the dificulties of molten pool spreading and droplet transfer of Ni-based welding *** of short-circuit current was used to reduce *** length stabilizer was used to acquire a proper and stable arc length maintained at the critical position where short circuit starts to ***-arc P-GMAW with or without arc length stabilizer was *** droplet transfer,arc behaviors and weld bead profiles were investigated and compared based on the high-speed photography and observation of weld *** the arc length stabilizer was deactivated,the arc length was unstable and too *** droplet transfer mode was mainly short circuit partial transfer,with only a small part of the droplet transferred into the molten pool,with the characteristics of no obvious necking,a few spatters,small droplet impact,long short circuit duration and high short-circuit *** was also a small proportion of short circuit complete transfer with obvious necking,larger droplet impact,shorter short-circuit duration and lower short-circuit *** arc length stabilizer,droplet transfer modes were short circuit complete transfer and spray *** spray transfer had the largest droplet impact,no short circuit and no *** the arc length stabilizer activated,a deep penetration,a high penetration ratio,a small reinforcement and a large reinforcement factor were *** provides an innovative method to solve the difficulties of droplet transfer and molten pool spreading and eliminate the incomplete fusion in the GMAW of 9%Ni steel with nickel-based alloy welding wire.

关键词： droplet transfer arc behaviors weld bead formation short-arc pulsed gas metal arc welding(P-GMAW) high nickel alloy 9%Ni steel

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Immunological disturbance effect of exogenous histamine towards key immune cells

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Food Science and Human Wellness 2024年第4期13卷 1856-1863页

作者： Yanan Liu Huan Li Chong Wang Shanjun Chen Renjie Lian Weiqiang Wang Linglin Fu Yanbo Wang Food Safety Key Laboratory of Zhejiang Province School of Food Science and BiotechnologyZhejiang Gongshang UniversityHangzhou 310018China Jinghai group co. Ltd.Rongcheng 264307China Jinhua Jinnian Ham co. Ltd.Jinhua 321041China School of Food and Health Beijing Technology and Business UniversityBeijing 100048China

Histamine in food has attracted widespread attention due to the potential toxicity and associated health ***,its influences on immunological components,especially the function of key immune cells,are still poorly *** this work,we explored the effects of exogenous histamine on the function of key immune cells such as intestinal epithelial cells,dendritic cells,and T *** results showed that histamine could affect the expression of allergy-related genes in CMT93 cells at a high dose of ***,it’s found that histamine could cause an imbalance in the levels of relevant immune factors secreted by dendritic cells and T cells,especially those related to *** the same time,the proportion of MHC class IIpositive dendritic cells and the proportion of T helper 2(Th2)cells in CD4^(+)T cells increased after histamine *** concluded that the presence of a certain level of histamine in food may affect the expression of allergy-related cytokines,disrupt the balance of the immune homeostasis,and potentially lead to adverse immune *** work demonstrated the importance of including the estimation of histamine’s immune safety in aquatic products rather than merely considering the potential risk of food poisoning.

关键词： Histamine Immunological disturbance Food allergy Immune factor Edible safety

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Research status, hot spots, difficulties and future development direction of microbial geoengineering

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Journal of Road Engineering 2024年第2期4卷 234-255页

作者： Yingxin Zhou Zhiqing Li Peng Zhang Qi Wang Weilin Pan Shuangjiao Wang Xiongyao Xie Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Yunnan communications investment&construction group co. Ltd.Kunming 650103China Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China college of Earth and Planetary Science University of Chinese Academy of SciencesBeijing 100049China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China China Energy Technology and Economics Research Institute Beijing 102211China Cangzhou Qugang Expressway construction co. Ltd.Cangzhou 062450China Henan Yelu Expressway construction co. Ltd.Pingdingshan 467000China Beijing Zhongyan Tiandi Technology co. Ltd.Beijing 100029China

Microbial geoengineering technology,as a new eco-friendly rock and soil improvement and reinforcement technology,has a wide application ***,this technology still has many deficiencies and is difficult to achieve efficient curing,which has become the bottleneck of large-scale field *** paper reviews the research status,hot spots,difficulties and future development direction microbial induced calcium carbonate precipitation(MICP)*** principle of solidification and the physical and mechanical properties of improved rock and soil are systematically *** solidification efficiency is mainly affected by the reactant itself and the external *** present,the MICP technology has been preliminarily applied in the fields of soil solidification,crack repair,anti-seepage treatment,pollution repair and microbial ***,the technology is currently mainly limited to the laboratory level due to the difficulty of homogeneous mineralization,uneconomical reactants,short microbial activity period and large environmental interference,incidental toxicity of metabolites and poor field *** directions include improving the uniformity of mineralization by improving grouting methods,improving urease persistence by improving urease activity,and improving the adaptability of bacteria to the environment by optimizing bacterial ***,the authors point out the economic advantages of combining soybean peptone,soybean meal and cottonseed as carbon source with phosphogypsum as calcium source to induce Caco3.

关键词： Microbial geoengineering Microbial induced calcium carbonate precipitation Bacillus pasteurii Urease Phosphogypsum

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Heterogeneous information phase space reconstruction and stability prediction of filling body–surrounding rock combination

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1500-1511页

作者： Dapeng Chen Shenghua Yin Weiguo Long Rongfu Yan Yufei Zhang Zepeng Yan Leiming Wang Wei Chen School of Civil and Resources Engineering University of Science and Technology of BeijingBeijing 100083China Production Technology Department Longshou MineJinchuan Group Co.Ltd.Jinchang 737100China School of Civil Engineering and Architecture East China Jiaotong UniversityNanchang 330013China

Traditional research believes that the filling body can effectively control stress concentration while ignoring the problems of unknown stability and the complex and changeable stress distribution of the filling body–surrounding rock combination under high-stress *** monitoring data processing methods cannot fully consider the complexity of monitoring objects,the diversity of monitoring methods,and the dynamics of monitoring *** solve this problem,this paper proposes a phase space reconstruction and stability prediction method to process heterogeneous information of backfill–surrounding rock *** three-dimensional monitoring system of a large-area filling body–surrounding rock combination in Longshou Mine was constructed by using drilling stress,multipoint displacement meter,and *** information,such as the stress and displacement of the filling body–surrounding rock combination,was continuously *** with the average mutual information method and the false nearest neighbor point method,the phase space of the heterogeneous information of the filling body–surrounding rock combination was then *** this paper,the distance between the phase point and its nearest point was used as the index evaluation distance to evaluate the stability of the filling body–surrounding rock *** evaluated distances(ED)revealed a high sensitivity to the stability of the filling body–surrounding rock *** new method was then applied to calculate the time series of historically ED for 12 measuring points located at Longshou *** moments of mutation in these time series were at least 3 months ahead of the roadway return *** the ED prediction experiments,the autoregressive integrated moving average model showed a higher prediction accuracy than the deep learning models(long short-term memory and Transformer).Furthermore,the root-mean-square error distribution of the prediction results peaked at 0

关键词： deep mining filling body–surrounding rock combination phase space reconstruction multiple time series stability prediction

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Pudilan Xiaoyan oral liquid regulates tissue inflammation and apoptosis in mice with influenza virus pneumonia

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Traditional Medicine Research 2024年第6期9卷 55-63页

作者： Shan Cao Shuang-Rong Gao Chen Ni Zi-Han Geng Ying-Li Xu Bo Pang Meng-Ping Chen Yu Zhang Shan-Shan Guo Yu-Jing Shi Li-Qi Ni Kun Wang Rong-Hua Zhao Xiao-Lan Cui Yan-Yan Bao Institute of Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing 100700China Jumpcan Pharmaceutical group co. Ltd.Taizhou 225400China

Background:The influenza A virus is the primary cause of respiratory infections and poses a global health *** Xiaoyan oral liquid(PDL)exhibits anti-inflammatory and immunomodulatory *** is commonly employed in clinical practice to manage upper respiratory tract ***,there is still much to uncover regarding its potential therapeutic ***:Institute of cancer research mice were infected with influenza A virus via nasal *** general state of the mice,lung index,and lung index inhibition rate were used to evaluate the efficacy of ***-linked immunosorbent assay,western blotting,and immunohistochemistry were used to observe the presence of proteins and cytokines in the lung *** was evaluated using the TUNEL ***:PDL improved the mental state of influenza A virus-infected mice,reduced the lung index,and inhibited viral *** expression of interleukin-1βand tumor necrosis factor-αwere decreased,whereas the expression of interleukin-10 in the lung tissue was increased due to PDL *** addition,PDL treatment modulated Toll-like receptor 4 and MyD88 expressions in the lung *** significantly reduced apoptosis and decreased cleaved caspase-3 and PARP levels,whereas increased B-cell lymphoma-2 expression in the lung ***,the moderate-dose group of PDL exhibited a more pronounced *** findings indicate that PDL exerts a protective effect against pneumonia injury in influenza A virus-infected ***:PDL inhibited the inflammatory response and regulated apoptosis by regulating Toll-like receptor 4 and MyD88 protein expressions,thereby protecting the lung tissue from viral infection-induced lung tissue injury.

关键词： Pudilan Xiaoyan oral liquid influenza A virus immune response apoptosis Toll-like receptors

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A Review of 2023 Supervision Updates of cosmetics in China

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China Detergent & cosmetics 2024年第2期9卷 18-25页

作者： Li Neng Shanghai WEIPU Testing International group co. Ltd.China

In 2023,multiple supporting documents of the Regulations on the Supervision and Administration of cosmetics and regulatory requirements for toothpaste were successively *** article provides a detailed introduction to the updates of domestic cosmetics regulations in China in 2023,and sorts out the details of the 2023 unqualified cosmetics notification and flight inspection issued by regulatory authorities,analyzes the reasons,and helps cosmetics companies further understand regulatory requirements,implement the main responsibility of cosmetics quality and safety,and respond to changes in cosmetics regulatory policies,so as to avoid being notified of unqualified products,economic and reputation losses as much as possible.

关键词： cosmetic toothpaste regulatory status review

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