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Damage evolution analysis of rock under Uniaxial compression and Brazilian splitting based on discrete element method 10

Damage evolution analysis of rock under Uniaxial compression...

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2020 10th Chinese Geosynthetics Conference and International Symposium on Civil Engineering and Geosynthetics, ISCEG 2020

作者： De-Kang, Li Hao-Ran, Li Meng, Liu Zi-Heng, Wang Zheng, Li Structural Health Monitoring and Control Institute Shijiazhuang Tiedao University Shijiazhuang Hebei050043 China Key Laboratory for Health Monitoring and Control of Large Structures Shijiazhuang Tiedao University Shijiazhuang Hebei050043 China Second Geological Team of Hebei Coalfield Geological Bureau Xingtai Hebei054001 China

In order to better analyze the mechanical behavior of rock in uniaxial compression and Brazilian splitting, numerical model was established according to laboratory test by PFC2D particle flow program, and the simulation results were compared with the experimental results. The results show that when the rock reaches the peak stress, the failure curve of cement appears an obvious turning point, and the failure rate of cement *** compressive strength of rock is much greater than the tensile strength under compression condition. The preloading method is more detailed for experimental restoration, and it provides certain reference significance for rock simulation in the future. © The Authors, published by EDP Sciences 2020.

关键词： Rocks

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A long-term vertical displacement prediction method of concrete bridges based on meteorological shared data and optimized GRU model

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Measurement: Journal of the International Measurement Confederation 2025年 253卷

作者： Wang, Xu Xie, Guilin Liu, Wentao Kong, Hu Gao, Yang State Key Laboratory of Mountain Bridge and Tunnel Engineering Chongqing Jiaotong University Chongqing400074 China School of Civil Engineering Chongqing Jiaotong University Chongqing400074 China China Merchants Chongqing Road Engineering Inspection Center Co. Ltd Chongqing400067 China Department of Civil and Transportation Engineering Hohai University Nanjing210098 China Key Laboratory for Structure Health Monitoring and Control in Hebei Province Shijiazhuang Tiedao University Shijiazhuang050043 China

Based on data from the meteorological shared data platform, this study proposes a method for predicting the long-term vertical displacement (VD) of concrete bridges by integrating the Northern Goshawk Optimization (NGO) algorithm with the Gated Recurrent Unit (GRU) network. This method can be employed to safely assess concrete bridges and recover missing VD data. Specifically, it uses historical meteorological information and time information provided by the meteorological shared data platform (European Centre for Medium-Range Weather Forecasts) to generate the input parameters of the GRU model. It then employs the long-term VD data from the concrete bridge structural health monitoring system to produce the output parameters of the GRU model. Moreover, the hyperparameters for the GRU model training are optimized using the NGO algorithm. Four NGO-GRU models with different input conditions are proposed, taking the long-term VD prediction of a prestressed concrete bridge as a case study and considering the correlation between different meteorological factors and VD and the long-term time-dependent effects on concrete structures. Through a comparative analysis of the model's prediction performance of multiple sensors under different conditions, it is found that the NGO-GRU model achieved the best prediction performance when using a combination of air temperature, time information, air pressure, solar radiation intensity, and wind speed as inputs, with a prediction error of less than 6.00%. Furthermore, compared with the benchmark models, the NGO-GRU model demonstrated the highest accuracy in VD prediction. Under the optimal input conditions, the prediction performance of the NGO-GRU model improved by 16.46% to 46.17% compared with the other models, validating the robustness and effectiveness of the proposed method. © 2025 Elsevier Ltd

关键词： Concrete bridges Long-term monitoring Meteorological shared data Northern goshawk optimization-based GRU Structural health monitoring Vertical displacement

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Analysis on strain transfer of fiber optic Fabry-Perot sensors-based on FEM method

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World Forum on Smart Materials and Smart structures Technology, SMSST 07

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control ofHebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing China

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Analysis on a novel reflective intensity modulated fiber optic temperature sensor

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World Forum on Smart Materials and Smart structures Technology, SMSST 07

作者： Dai, Jingyun Zhang, Wentao Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing China

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A novel fiber-mercury temperature sensor

A novel fiber-mercury temperature sensor

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Fundamental Problems of Optoelectronics and Microelectronics III

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei 050043 State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083

ISBN: (纸本)0819467278

Fiber optic sensors are widely used in structure monitoring and smart materials to measure the temperature. In this paper, a novel fiber-mercury temperature sensor (FMTS) is designed and tested. The sensor is made using the surface of the mercury to act as the reflector. The intensity of the reflective light is the function of the distance between the surface of the mercury and the fiber end, which is determined by the thermal extension of the mercury. And different length of the mercury in the capillary defines different sensitivity of the sensor. The modulation function of the sensor is analyzed. Experiment was carried out to evaluate the performance of the sensor, and the results present a good correlation between the theoretical and experimental result.

关键词： Temperature sensors

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FBG sensor network in Qinghai-Tibet railway

FBG sensor network in Qinghai-Tibet railway

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Network Architectures, Management, and Applications V

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei 050043 State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083

ISBN: (纸本)9780819469472

In this paper, fiber Bragg grating (FBG) sensors network in the subgrade temperature monitoring system in Qinghai-Tibet railway is presented. The principle of the FBG temperature sensor is introduced and the feasibility of the FBG sensors in the permafrost regions of Qinghai-Tibet plateau is analyzed. The FBG sensor network architecture is introduced. This sensor network includes the sensor chains embedded in the roadbed, slave optical cables, work stations including the FBG sensor interrogator and the optical router, master optical cables, and center workstation. We give the primary experimental result of this sensor network in monitoring the roadbed temperature of the railway at DK0985+000 near Chumar River. Fifteen FBG temperature sensors were embedded into the roadbed monitoring hole. The temperature data was collected after a month when the temperature field in the monitoring hole is stable. The result of the experiment shows that the FBG temperature sensors have an accuracy of 0.1 centigrade. Furthermore, the experimental result shows the stability and reliability of the FBG sensor network in the harsh environment of Qinghai-Tibet plateau. In the end, the conclusion is drawn and the prospect of the FBG sensor network in monitoring other parameters in the Qinghai-Tibet plateau is also presented.

关键词： Optical sensors

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Experiment on dynamic response of fiber optic Fabry-Perot sensors and its application in structural health monitoring

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World Forum on Smart Materials and Smart structures Technology, SMSST 07

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing China

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Estimation of hydraulic parameters from pumping tests in a multiaquifer system

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Underground Space 2020年第3期5卷 210-222页

作者： Da Ha Gang Zheng Haizuo Zhou Chaofeng Zeng Huihui Zhang School of Civil Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Coast Civil Structure Safety of Ministry of Education Tianjin UniversityTianjin 300072China Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring School of Civil EngineeringHunan University of Science and TechnologyXiangtanHunan 411201China School of Resources and Environmental Sciences Wuhan UniversityWuhan 430079China

The hydrogeologic conditions in Tianjin,China,are characterized by a system of multiple alternating aquifers and aquitards and a high groundwater ***,the groundwater system to a depth of 70 m includes one phreatic aquifer and three semiconfined aquifers(AqI–AqIII).The distribution of aquifers varies *** estimates of aquifer parameters from pumping tests are essential in geotechnical engineering *** this study,the applicability of different models for estimating hydraulic parameters in a multiaquifer system is *** avoid errors in the graphic-analytical process and to enhance the efficiency and accuracy,a hybrid algorithm,called GALMA(a genetic algorithm(GA)combined with the Levenberg–Marquardt(LM)algorithm),is used with the Neuman and Witherspoon model and ratio *** estimated values in the second and third semiconfined aquifers(AqII and AqIII)from various solutions are compared with the measured *** validations based on the prediction of the drawdown values are performed via a three dimensional numerical simulation.

关键词： Hydraulic parameter Leaky aquifer Pumping test Optimal approach

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A novel fiber optic concrete sensor based on EFPI

A novel fiber optic concrete sensor based on EFPI

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International Conference on Smart Materials and Nanotechnology in Engineering

作者： Zhang, Wentao Dai, Jingyun Sun, Baochen Du, Yanliang Key Lab. of Structure Health Monitoring and Control of Hebei Province Shijiazhuang Railway Institute Shijiazhuang Hebei 050043 China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083

ISBN: (纸本)9780819465368

In this paper, a novel fiber optic concrete sensor based on extrinsic fiber Fabry-Perot interferometer (EFPI) is designed and analyzed. Two fiber ends are inserted into a glass capillary and encapsulated into a cement cylinder to act as the sensor head. In this way, the cement cylinder itself is the sensor head instead of the traditional steel tube, which makes it very convenient to embed the sensor head into the concrete, because the cement consists with the concrete well. Based on the theory of white light interferometry and the theory of elasticity, the wavelength modulation method and the strain transfer are analyzed theoretically. The demodulation system is also introduced in this paper. The experiment being made by our research group is aimed at testing the consistency, stability, reliability and the sensitivity of the fiber optic sensor. The sensor head of the cement cylinder is embedded into a model ferroconcrete beam together with traditional strain gauges. The experiment is carried out using the PEM-500A hydraulic pulsation fatigue test machine after 2 million stress circles. The readout of the fibre optic sensor and the strain gauges is recorded and made a contrast. It can be found from the result that the fibre optic sensors have good stability and reliability, the accuracy for the fibre optic sensor is better than 0.5 micro-strain, which shows that the sensor can meet the demand of the long-term monitoring of large-size concrete structure.

关键词： Fiber optic sensors

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Comparative analysis of thermodynamic and mechanical responses between underground hydrogen storage and compressed air energy storage in lined rock caverns

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International Journal of Mining Science and Technology 2024年第4期34卷 531-543页

作者： Bowen Hu Liyuan Yu Xianzhen Mi Fei Xu Shuchen Li Wei Li Chao Wei Tao Zhang State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Key Laboratory of Large Structure Health Monitoring and Control Shijiazhuang Tiedao UniversityShijiazhuang 050043China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China

Underground hydrogen storage(UHS)and compressed air energy storage(CAES)are two viable largescale energy storage technologies for mitigating the intermittency of wind and solar ***,it is meaningful to compare the properties of hydrogen and air with typical thermodynamic storage *** study employs a multi-physical coupling model to compare the operations of CAES and UHS,integrating gas thermodynamics within caverns,thermal conduction,and mechanical deformation around rock *** thermodynamic responses are validated using additional simulations and the field test *** and pressure variations of air and hydrogen within rock caverns exhibit similarities under both adiabatic and diabatic simulation *** reaches higher temperature and pressure following gas charging stage compared to air,and the ideal gas assumption may lead to overestimation of gas temperature and *** steel lining of CAES,the sealing layer(fibre-reinforced plastic FRP)in UHS is prone to deformation but can effectively mitigates stress in the sealing *** CAES,the first principal stress on the surface of the sealing layer and concrete lining is tensile stress,whereas UHS exhibits compressive stress in the same *** present research can provide references for the selection of energy storage methods.

关键词： Underground hydrogen storage Compressed air energy storage Mechanical response Thermodynamic response Lined rock caverns

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