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Numerical Simulation of Surrounding Rock Deformation and Grouting Reinforcement of Cross-Fault Tunnel under Different Excavation Methods

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Computer Modeling in Engineering & Sciences 2024年第3期138卷 2445-2470页

作者： duan zhu Zhende zhu Cong Zhang LunDai Baotian Wang Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing210098China Jiangsu Research Center for Geotechnical Engineering Technology Hohai UniversityNanjing210098China

Tunnel construction is susceptible to accidents such as loosening, deformation, collapse, and water inrush, especiallyunder complex geological conditions like dense fault areas. These accidents can cause instability and damageto the tunnel. As a result, it is essential to conduct research on tunnel construction and grouting reinforcementtechnology in fault fracture zones to address these issues and ensure the safety of tunnel excavation projects. Thisstudy utilized the Xianglushan cross-fault tunnel to conduct a comprehensive analysis on the construction, support,and reinforcement of a tunnel crossing a fault fracture zone using the three-dimensional finite element numericalmethod. The study yielded the following research conclusions: The excavation conditions of the cross-fault tunnelarray were analyzed to determine the optimal construction method for excavation while controlling deformationand stress in the surrounding rock. The middle partition method (CD method) was found to be the most ***, the effects of advanced reinforcement grouting on the cross-fault fracture zone tunnel were studied,and the optimal combination of grouting reinforcement range (140°) and grouting thickness (1m) was *** stress and deformation data obtained fromon-site monitoring of the surrounding rock was slightly lower thanthe numerical simulation results. However, the change trend of both sets of data was found to be consistent. Theseresearch findings provide technical analysis and data support for the construction and design of cross-fault tunnels.

关键词： Cross-fault tunnel finite element analysis excavation methods surrounding rock deformation grouting reinforcement

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Railway switch fault diagnosis based on Multi-heads Channel Self Attention,Residual Connection and Deep CNN

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Transportation Safety and Environment 2023年第1期5卷 58-65页

作者： Xirui Chen Hui Liu zhu duan Institute of Artificial Intelligence&Robotics(IAIR) Key Laboratory of Traffic Safety on Track of Ministry of EducationSchool of Traffic and Transportation EngineeringCentral South UniversityChangsha 410075HunanChina.

A novel switch diagnosis method based on self-attention and residual deep convolutional neural networks(CNNs)is *** of the imbalanced dataset,the K-means synthetic minority oversampling technique(SMOTE)is applied to balancing the dataset at ***,the deep CNN is utilized to extract local features from long power curves,and the residual connection is performed to handle the performance *** the end,the multi-heads channel self attention focuses on those important local *** ablation and comparison experiments are applied to verifying the effectiveness of the proposed *** the residual connection and multi-heads channel self attention,the proposed method has achieved an impressive accuracy of 99.83%.The t-SNE based visualizations for features of the middle layers enhance the trustworthiness.

关键词： fault diagnosis railway switch residual connection channel self-attention deep convolutional neural network

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A Hybrid Neural Network Model for Marine Dissolved Oxygen Concentrations Time-Series Forecasting Based on Multi-Factor Analysis and a Multi-Model Ensemble

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Engineering 2021年第12期7卷 1751-1765页

作者： Hui Liu Rui Yang zhu duan Haiping Wu Institute of Artificial Intelligence and Robotics(IAIR) Key Laboratory of Traffic Safety on Track of Ministry of EducationSchool of Traffic and Transportation EngineeringCentral South UniversityChangsha 410075China

Dissolved oxygen(DO)is an important indicator of aquaculture,and its accurate forecasting can effectively improve the quality of aquatic *** this paper,a new DO hybrid forecasting model is proposed that includes three stages:multi-factor analysis,adaptive decomposition,and an optimizationbased ***,considering the complex factors affecting DO,the grey relational(GR)degree method is used to screen out the environmental factors most closely related to *** consideration of multiple factors makes model fusion more ***,the series of DO,water temperature,salinity,and oxygen saturation are decomposed adaptively into sub-series by means of the empirical wavelet transform(EWT)***,five benchmark models are utilized to forecast the sub-series of EWT *** ensemble weights of these five sub-forecasting models are calculated by particle swarm optimization and gravitational search algorithm(PSOGSA).Finally,a multi-factor ensemble model for DO is obtained by weighted *** performance of the proposed model is verified by timeseries data collected by the pacific islands ocean observing system(PacIOOS)from the WQB04 station at *** evaluation indicators involved in the experiment include the Nash–Sutcliffe efficiency(NSE),Kling–Gupta efficiency(KGE),mean absolute percent error(MAPE),standard deviation of error(SDE),and coefficient of determination(R^(2)).Example analysis demonstrates that:①The proposed model can obtain excellent DO forecasting results;②the proposed model is superior to other comparison models;and③the forecasting model can be used to analyze the trend of DO and enable managers to make better management decisions.

关键词： Dissolved oxygen concentrations forecasting Time-series multi-step forecasting Multi-factor analysis Empirical wavelet transform decomposition Multi-model optimization ensemble

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Novel Method for Spatial Angle Measurement Based on Rotating Planar Laser Beams

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Chinese Journal of Mechanical Engineering 2010年第6期23卷 758-764页

作者： YANG Linghui YANG Xueyou zhu Jigui duan Muqiong LAO Dabao State Key Laboratory of Precision Measuring Technology and Instruments Tianjin University Tianjin 300072 China

Spatial angle measurement, especially the measurement of horizontal and vertical angle, is a basic method used for industrial large-scale coordinate measurement. As main equipments in use, both theodolites and laser trackers can provide very high accuracy for spatial angle measurement. However, their industrial applications are limited by low level of automation and poor parallelism. For the purpose of improving measurement efficiency, a lot of studies have been conducted and several alternative methods have been proposed. Unfortunately, all these means are either low precision or too expensive. In this paper, a novel method of spatial angle measurement based on two rotating planar laser beams is proposed and demonstrated. Photoelectric receivers placed on measured points are used to receive the rotating planner laser signals transmitted by laser transmitters. The scanning time intervals of laser planes were measured, and then measured point＇s horizontal/vertical angles can be calculated. Laser plane＇s angle parameters are utilized to establish the abstract geometric model of transmitter. Calculating formulas of receiver＇s horizontal/vertical angles have been derived. Measurement equations＇ solvability conditions and judgment method of imaginary solutions are also presented after analyzing. Proposed method for spatial angle measurement is experimentally verified through a platform consisting of one laser transmitter and one optical receiver. The transmitters used in new method are only responsible for providing rotating light plane signals carrying angle information. Receivers automatically measure scanning time of laser planes and upload data to the workstation to calculate horizontal angle and vertical angle. Simultaneous measurement of multiple receivers can be realized since there is no human intervention in measurement process .Spatial angle measurement result indicates that the repeatable accuracy of new method is better than 10＂. Proposed method can improve m

关键词： large-scale coordinate measurement spatial angle measurement rotating planar laser beams measurement automation

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Topology of Knotted Optical Vortices

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Communications in Theoretical Physics 2008年第8期50卷 345-348页

作者： REN Ji-Rong zhu Tao duan Yi-Shi Institute of Theoretical Physics Lanzhou University Lanzhou 730000 China

Optical vortices as topological objects exist ubiquitously in *** this paper,by making use of the duan's topological current theory,we investigate the topology in the closed and knotted optical *** topological inner s... 详细信息

关键词： optical vortices knot topology topological current

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A hybrid ensemble deep reinforcement learning model for locomotive axle temperature using the deterministic and probabilistic strategy

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Transportation Safety and Environment 2023年第3期5卷 20-29页

作者： Guangxi Yan Hui Liu Chengqing Yu Chengming Yu Ye Li zhu duan Institute of Artificial Intelligence&Robotics(IAIR) Key Laboratory of Traffic Safety on Track of Ministry of EducationSchool of Traffic and Transportation EngineeringCentral South UniversityChangsha 410075HunanChina

This paper proposes a hybrid deep reinforcement learning framework for locomotive axle temperature by combining the wavelet packet decomposition(WPD),long short-term memory(LSTM),gated recurrent unit(GRU)reinforcement learning and generalized autoregressive conditional heteroskedasticity(GARCH)*** WPD is utilized to decompose the raw nonlinear series into *** the deep learning predictors LSTM and GRU are established to predict the future axle temperatures in each *** Q-learning could generate optimal ensembleweights to integrate the predictors to finish the deterministic forecasting and GARCH is used to conduct the deterministic forecasting based on the deterministic forecasting *** parts of the hybrid ensemble structure contributed to optimal modelling accuracy and provided effective support in the real-time monitoring and fault diagnosis of transportation.

关键词： locomotive axle temperature reinforcement learning wavelet packet decomposition(WPD) deterministic forecasting probabilistic forecasting

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JOINT　MODEL　AND　CRITERION　OPTIMAL　EXPERIMENT　DESIGN

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Applied Mathematics(A Journal of Chinese Universities) 1997年第1期12卷 41-48页

作者： LIU HANCONG, zhu WEIYONG AND duan XIAODONG

Abstract In this paper, a new optimal design criterion——joint model and criterion optimal design criterion is put forward. The design that is subject to this criterion satisfies many kinds of linear optimal criterion and D optimal criterion on several experiment models at the same time. The equivalent condition of this optimal design is given. Its iterative algorithm and the algorithm covergence are stated.

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Effects of laser power density on static and dynamic mechanical properties of dissimilar stainless steel welded joints

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Acta Mechanica Sinica 2012年第5期28卷 1334-1339页

作者： Yan-Peng Wei Mao-Hui Li Gang Yu Xian-Qian Wu Chen-Guang Huang zhu-Ping duan Key Laboratory of Hydrodynamics and Ocean Engineering Institute of MechanicsChinese Academy of Sciences The Quartermaster Equipment Research Institute of the General Logistics Department of PLA Key Lab of Mechanics in Advanced Manufacturing Institute of MechanicsChinese Academy of Sciences The State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of Sciences

The mechanical properties of laser welded joints under impact loadings such as explosion and car crash etc. are critical for the engineering designs. The hardness, static and dynamic mechanical properties of AISI304 and AISI316L dissimilar stainless steel welded joints by CO2 laser were experimentally studied. The dynamic strainstress curves at the strain rate around 103 s-1 were obtained by the split Hopkinson tensile bar （SHTB）. The static mechanical properties of the welded joints have little changes with the laser power density and all fracture occurs at 316 L side. However, the strain rate sensitivity has a strong depen- dence on laser power density. The value of strain rate factor decreases with the increase of laser power density. The welded joint which may be applied for the impact loading can be obtained by reducing the laser power density in the case of welding quality assurance.

关键词： Laser welding Dynamic mechanics Strain rate.Power density

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Renormalization Group Approach on Nanostructured Systems

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Chinese Physics Letters 1997年第4期14卷 291-294页

作者： YAN Xiao-hong ZHANG Li-de duan zhu-ping YANG Qi-bin Institute of Solid State Physics Chinese Academy of SciencesHefei 230031 Department of Physics Xiangtan UniversityXiangtan 411105 LNM Institute of MechanicsChinese Academy of SciencesBeijing 100080

The electronic spectra of one-dimensional nanostructured systems are calculated within the pure hopping model on the tight-binding *** means of the renormalization group Green's function method,the dependence of the density of states on the distributions of nanoscaled grains and the changes of values of hopping integrals in nanostructured systems are *** is found that the frequency shifts are dependent rather on the changes of the hopping integrals at nanoscaled grains than the distribution of nanoscaled grains.

关键词： integrals pure spectra

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Bioinformatics analysis of potential essential genes that response to the high intraocular pressure on astrocyte due to glaucoma

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International Journal of Ophthalmology(English edition) 2015年第2期8卷 395-398页

作者： Yang Yang Jing-zhu duan Yu Di Dong-Mei Gui Dian-Wen Gao Department of Ophthalmology China Medical UniversityShengjing Hospital Department of Orthopedics China Medical UniversityShengjing Hospital

AIM: To study the gene expression response and predict the network in cell due to pressure effects on optic nerve injury of ***: We used glaucoma related microarray data in public database [Gene Expression Omnibus(GEO)] to explore the potential gene expression changes as well as correspondent biological process alterations due to increased pressure in astrocytes during glaucoma ***: A total of six genes were identified to be related with pressure increasing. Through the annotation and network analysis, we found these genes might be involved in cell morphological remodeling, angiogenesis,mismatch ***: Increasing pressure in glaucoma on astrocytes might cause gene expression alterations,which might induce some cellular responses changes.

关键词： high intraocular pressure microarray glaucoma astrocytes

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