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31 December 2024, Volume 34 Issue 4 Previous Issue    Next Issue
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Road and Bridge Engineering Column
Column on Water Conservancy Engineering and Water Conservancy Informatization
Project Management Column
Computer Application and Automatic Control Column
Remote Sensing and Ecology Environment Column


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Road and Bridge Engineering Column

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Research on the Application of Invito Prestress Reinforcement Technology Based on MIDAS Multi-condition Simulation SHI Xianzeng, SHAN Guoqing 2024, 34(4): 1-6.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.001 Abstract ( )   PDF (870KB) ( )   With the prosperity and development of China's economy, the rapid growth of traffic flow poses a severe challenge to the structural safety of old bridges. In this paper, taking a continuous box girder bridge in the south approach of a Yangtze River Bridge as the object of study, aiming at a variety of crack diseases caused by the lack of effective maintenance due to long-term operation, the cause of the disease was determined by field detection and finite element analysis, such as the loss of steel bundle prestress and the degradation of structural performance. The applicability of different reinforcement technologies was comprehensively analyzed, and a reinforcement scheme for arranging external prestressed steel bundles inside the box girder was proposed. This scheme not only significantly improves the stress state of the bridge span structure, increases its bearing capacity by about 17.26%, but also greatly reduces the tensile stress level of the bridge span by up to 50.80%, effectively eliminating the structural safety hazards and ensuring the safe operation of the bridge. References | Related Articles | Metrics

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Analysis of Pavement Diseases Caused by Thermal Regeneration and Research on On-site Thermal Regeneration Construction Technology for Mtn LI Guangyu, WANG Haijiao, WANG Qiyue 2024, 34(4): 7-10.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.002 Abstract ( )   PDF (722KB) ( )   In this paper, the surface layer diseases of K291+250-K315+085 Xinyuan Expressway in Hebei province and the technical indicators of thermal regeneration pavement were statistically analyzed, and the key technical points of geothermal regeneration construction were summarized. the special maintenance project on the upper layer of the highway can adopt the geothermal regeneration construction technology, make full use of waste milling material, by adding 5% ~ 7% (the content of regenerator is 5% ~ 7% of the asphalt content in the milling waste) Mtn modified regenerator, 20% newly mixed modified asphalt mixture (the blending ratio of milling material and new additive is milling material: new additive =80∶20), through the heating unit heating, so that after the “field processing” of the new asphalt mixture to meet the technical requirements of road upgrading. After paving and compacting, the overall quality of the road reaches the qualified standard and meets the traffic conditions. the construction technology is mature, safe and reliable, energy saving and environmental protection, meets the national requirements of low carbon and economy, and provides construction reference and basis for the special maintenance of highway pavement geothermal regeneration technology. References | Related Articles | Metrics

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Dynamic Response Analysis of Continuous Beam Bridges Based on Lateral Collision Effect CHEN Kanglong 2024, 34(4): 11-16.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.003 Abstract ( )   PDF (1036KB) ( )   The study of beam dynamic response is an important branch in the field of bridge engineering, especially when considering lateral collision effects. In order to study the effect of lateral collision on the dynamic response of continuous beam bridges, an open system for earthquake engineering simulation (OpenSees) finite element software was used to build a finite element model of the entire bridge. The dynamic response and vulnerability changes of the bridge were compared and analyzed with and without lateral collision. The results show that when the peak ground acceleration is 1.0 gal, the probability of minor and complete damage to the support is 0.97 and 0.71, respectively, without lateral collision, and 0.92 and 0.65, respectively, with lateral collision. The lateral collision effect limits the relative displacement of the support through the limiting effect of the stopper, thereby reducing the probability of damage. This has practical guidance significance for the evaluation, reinforcement, and maintenance of bridges in seismic design. References | Related Articles | Metrics

Column on Water Conservancy Engineering and Water Conservancy Informatization

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Three-dimensional Numerical Simulation of a Landslide in South Bend River Basin Based on the Variation of Reservoir Water Level YU Pei 2024, 34(4): 17-22.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.004 Abstract ( )   PDF (949KB) ( )   Taking Nanwan landslide in Southwest Henan Province as an engineering example, combined with soil mechanics seepage theory and FLAC3D software, three-dimensional numerical simulation of Nanwan landslide in southwest Henan Province was carried out by using finite difference software FLAC3D software through the influence of reservoir water level sudden drop on pore water pressure and seepage field distribution, combined with two-dimensional unsaturated seepage theory and two-dimensional seepage analysis software in soil mechanics. The results show that the pore water pressure of the soil mass in Nanwan landslide in southwest Henan Province tends to increase when the reservoir water level was at 105.89m, and the soil mass was relatively dense, which has no adverse effect on the stability of the landslide. When the reservoir water level drops abruptly, the pore water pressure of the landslide body drops rapidly, driving the flow of soil particles in the landslide body. Due to the change of seepage force, the safety factor of landslide soil mass was reduced, and then the local instability of landslide soil mass was caused. It provides a theoretical reference for the analysis and evaluation of landslide stability under the state of reservoir water level rise and fall. References | Related Articles | Metrics

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Simulation of Residual Chlorine Decay in Water Supply Network Based on Hydraulic Model LIU Xiangxiang 2024, 34(4): 23-30.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.005 Abstract ( )   PDF (1010KB) ( )   In order to understand and master the variation of residual chlorine attenuation in water supply network and ensure the safety of water quality, a dynamic model of residual chlorine attenuation was established to simulate the decay trend of residual chlorine in water supply network of a district in Tianjin. The decay reaction coefficient of residual chlorine in the model was determined by the decay coefficient of total residual chlorine in the pipe network, the decay coefficient of residual chlorine in the main water of the pipe network and the decay coefficient of residual chlorine in the pipe wall water. The checking of the model coefficients can be divided into two aspects. On the one hand, the main water reaction coefficient of the pipe network is checked and determined to be 0.265d-1; on the other hand, the attenuation coefficient of residual chlorine in the pipe wall is checked. The checking is made by combining particle swarm optimization with the modeling software EPANET2.0, and the water quality model is finally determined when the iteration number is 100 and the particle size is 30. The effect is the best. Through the establishment of residual chlorine decay model of water supply network in this area, the decay trend of residual chlorine can be monitored in real time, so that water supply enterprises can carry out water quality evaluation and auxiliary dispatching maintenance and management work. References | Related Articles | Metrics

Project Management Column

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Analysis of the Key Factors for the Continuous Revival of Baiquan Spring Area in Xingtai WANG Buxin 2024, 34(4): 31-35.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.006 Abstract ( )   PDF (721KB) ( )   With the development of industrial and agricultural production and the increasing exploitation of groundwater, the Baiquan River in Xingtai has been shut down since the 1980s. In recent years, through a variety of measures to comprehensively control over-exploitation of groundwater and water ecological protection and restoration, the Baiquan Spring area has emerged one after another. To ensure the continued revival of Baiquan, the key problems such as the causes of the water cut-off in Baiquan Spring Basin, the causes of successive re-gushing, the over-exploitation of groundwater, the insufficient guarantee of re-gushing and the insufficient emergency measures are analyzed, meanwhile, the necessity and key measures for the continuous reswelling of Baiquan Spring area are put forward, which provides a scientific basis for formulating the goal and option of the sustainable re-gushing of Baiquan Spring area. References | Related Articles | Metrics

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Energy Audit and Energy Conservation Potential Analysis of a Government Agency in Hebei Province YIN Ziyang, XIAN Xiaodong, YAN Lichuan, HOU Nana, MA Kunru 2024, 34(4): 36-43.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.007 Abstract ( )   PDF (871KB) ( )   China is currently the world's largest energy consumer, with a significant proportion of carbon emissions in the construction industry. In order to promote energy conservation and consumption reduction in existing buildings, China has explicitly required government agencies and other public institutions at all levels to monitor energy consumption in real-time. In order to investigate the use of energy resources by government agencies, achieve scientific, rational, and efficient energy use, improve energy utilization efficiency, and reduce energy waste, an energy audit method was adopted to analyze the energy consumption structure and consumption indicators of a government agency in Hebei Province, comprehensively understand the use of energy resources, tap into energy-saving potential, and propose rational energy-saving suggestions to achieve the goal of strengthening energy management and improving energy efficiency, providing reference for similar public institutions in energy auditing and energy-saving renovation. References | Related Articles | Metrics

Computer Application and Automatic Control Column

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Research on Fault Diagnosis of Automotive Automatic Production Line Based on DT LIU Ya, HE Liangtao, CHANG Shuo, QI Zemin 2024, 34(4): 44-49.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.008 Abstract ( )   PDF (903KB) ( )   Traditional machine learning algorithms used for fault diagnosis in the automated production lines of automobiles require that the training and test sets have the same distribution and need a substantial number of training samples. However, in practice, fault sample data are difficult to acquire, and the operating conditions of production lines are highly variable, leading to a low fault classification accuracy. In view of these problems, this paper proposes a research method for fault diagnosis in automated automobile production lines based on Digital Twin (DT) technology. This method initially models the actual production lines using SolidWorks, followed by rendering through Unity 3D software, and combines with PLC for DT model simulation. Finally, the method utilizes transfer learning techniques and convolutional neural networks to achieve fault diagnosis. The feasibility of the proposed method is verified by comparison with existing methods. References | Related Articles | Metrics

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Design of a High-precision Remote Greenhouse Control System Based on the Internet of Things under the B/S Architecture WANG Zhaohui 2024, 34(4): 50-55.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.009 Abstract ( )   PDF (1041KB) ( )   The Internet of Things technology is adopted to build a high-precision temperature control problem for remote greenhouse. The network hardware architecture is designed and configured with a temperature control system based on greenhouse information acquisition sensors (temperature and humidity sensors, light sensors, CO2 sensors and soil moisture sensors) and controller (the main control chip is STM32F103VET6). Firstly, a greenhouse control network software framework was built based on B/S architecture, and noise information collected in greenhouse information was removed by filtering algorithm. Combined with controller characteristics and PID control theory, a greenhouse control algorithm was developed, and remote control of greenhouse temperature, humidity, light, CO2 concentration, soil moisture and other environmental factors and the design and operation of greenhouse control system were realized by implementing the developed algorithm. The experimental results show that the maximum signal to noise ratio of greenhouse information is 92.15dB after the design system is applied, and the calculated result of temperature control adjustment is consistent with the actual adjustment amount. How to further reduce the network delay and improve the control accuracy of greenhouse temperature is the key aspect of future system optimization and improvement. References | Related Articles | Metrics

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Cultural and Creative Product Design Based on Improved Apriori Algorithm for Cultural Association Feature Mining WU Dingbing 2024, 34(4): 56-60.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.010 Abstract ( )   PDF (765KB) ( )   In order to develop innovative cultural and creative products and improve the design efficiency of cultural and creative products, a product development system of cultural and creative correlation feature mining is designed with the support of improved Apriori algorithm.The system is composed of Apriori algorithm feature correlation module and product design module to improve the mining of cultural and creative feature correlation. The former excavates the correlative features of product design from the cultural information; the latter uses Boolean matrix and support adaptive updating strategy to improve Apriori algorithm and mining accurate correlation features of cultural and creative products. Designers design cultural and creative products through this feature and correlation.The experimental results show that the system can accurately mine cultural features and obtain the correlation between cultural features, and the accuracy rate of product design is greater than 0.90, the highest recall rate can reach 0.96, and the audience satisfaction evaluation is good.The system has good effect in developing cultural and creative products and has practical application value. References | Related Articles | Metrics

Remote Sensing and Ecology Environment Column

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Research on Three-Dimensional Slope Modeling Based on GIS and Unmanned Aerial Photography Technology WANG Ruilong, SUN Shiguo, WANG Hengtong, SONG Weiqi 2024, 34(4): 61-65.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.011 Abstract ( )   PDF (903KB) ( )   A three-dimensional modeling method for slopes based on Geographic Information System (GIS) and unmanned aerial photography technology is proposed in order to achieve high-precision restoration of surface texture and spatial undulations. The terrain and landform model is constructed using unmanned aerial photography and measurement techniques, and the stratigraphic model is established using GIS technology, thereby obtaining a high-precision three-dimensional model. In a certain section of a highway project, this method is applied to establish a slope three-dimensional model consisting of surface, stratigraphy, and underground mineral components. The results indicate that the slope three-dimensional model established using this method has the advantages of high accuracy and good visualization, and can accurately reflect the true conditions of the slope. References | Related Articles | Metrics

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Study on the Spatial-temporal Evolution Characteristics and Law of Wetland Landscape Index in Hengshui Lake LIU Xiushui, WANG Hongli 2024, 34(4): 66-73.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.012 Abstract ( )   PDF (1085KB) ( )   Landscape index is a constant quantitative index to study the evolution of landscape pattern, and exploring the change of landscape pattern is of great practical significance to maintain the sustainable development of nature reserves. By using the moving window method in ArcGIS and Fragstats software, this paper spatialized the selected landscape index, analyzed it from the two aspects of time and space, and studied the spatial-temporal evolution characteristics and change rules of Hengshui Lake wetland landscape index. The results showed that before the Yellow River diversion, the area of farmland and unused land changed sharply, resulting in a high degree of fragmentation. The low-value area of landscape index was distributed all around the lake area and transferred to the lake area. With the beginning of yellow diversion, especially after 1999, the aggregation degree of all types of patches was strengthened, the edge shape became regular, and the degree of fragmentation was reduced. In recent years, due to the increase of residential areas and unused land area, the degree of human interference has increased, resulting in the increase of landscape diversity and the gradual transfer of low-value landscape index areas to construction land in the peripheral protection belt. It is of great guiding significance for wetland landscape evolution and land resource utilization to analyze the changes of landscape types in Hengshui Lake and explore the characteristics of patch evolution under different driving factors. References | Related Articles | Metrics

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Assessment of Emission Reduction Effect of Emergency Control Measures for Heavy Pollution in Cangzhou City LU Ruijuan, GUO Xingli, HAN Xinhao, WANG Hongmei, CHI Meiling 2024, 34(4): 74-80.  DOI: 10.16046/j.cnki.issn2096-5680.2024.04.013 Abstract ( )   PDF (1048KB) ( )   Emergency response to heavy pollution weather has played a positive role in giving priority to protecting human health and reducing the peak of heavy air pollution. However, in the actual process of work, as emergency response to heavy pollution weather is at the initial stage and local governments lack practical experience, the pertinence and effectiveness of emergency control measures need to be improved and perfected.Based on the collection and collation of recent air quality data, air pollutant emission status data, source emission inventory data, heavy pollution emergency plan and emergency emission reduction list data, meteorological conditions data, and district-county statistical data, the emergency emission reduction measures of Cangzhou were analyzed. Typical heavy pollution days were brought into The Weather Research and Forecasting Mode(WRF)/Model of Emissions of Gases and Aerosols from Nature(MEGAN)/Sparse Matrix Operator Kernel(SMOKE)/The Comprehensive Air quality Model with extensions(CAMx)regional air quality model system for simulation, and the reduction ratio of four pollutants improvement effects before and after the implementation of emission reduction measures in different districts and counties in Cangzhou City was obtained.According to the model analysis results, the emission reduction measures of each district and county were comprehensively analyzed, and the emergency emission reduction measures and emission reduction effects of typical heavy pollution processes in autumn and winter were evaluated, providing core technical support for Cangzhou to improve and improve the emergency emission reduction effect. References | Related Articles | Metrics