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31 December 2022, Volume 32 Issue 4 Previous Issue    Next Issue
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Column on Water Conservancy Engineering and Water Conservancy Informatization
Ecological Hydrology and Water Resources Column
Remote Sensing and Ecology Environment Column
Computer Application and Automatic Control Column
Road and Bridge Engineering Column


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Column on Water Conservancy Engineering and Water Conservancy Informatization

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Study on Stability of Artificial Dam of Underground Reservoir in Coal Mine under Coupling Action of Overburden Rock and Hydraulic Power HU Xiao-long, SONG Dan-qing, LIU Xiao-li, ZHEN Wei-peng, SONG Xi-dong, WU Shu-quan 2022, 32(4): 1-7.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.001 Abstract ( )   PDF (986KB) ( )   Underground reservoir is one of the important engineering measures to solve water resource shortage in China. The construction of underground reservoir in mine goaf is of great significance to realize underground space in mine goaf and utilization of mine water resources and energy resources, and promote environmental and ecological protection in mine area. Taking Lingxin Coal mine in Ningxia as an example, a three-dimensional numerical model was established by using finite element method to study mechanical deformation characteristics of artificial dam body of underground reservoir in coal mine under overlying rock mass and design head load. The results show that the deformation of the artificial dam and surrounding rock of the underground reservoir is mainly concentrated in the front section of arch crown support and the bottom floor area of the upstream side, and the deformation of the retaining wall is concentrated in the middle area, and the maximum displacement of the dam is less than 1mm. The maximum stress of the dam is concentrated at the crown of the arch walling support, the maximum stress of the retaining wall is concentrated at the outside of the arch walling support, the maximum stress of the surrounding rock is concentrated at its junction with the arch walling support, and the maximum stress of the dam is less than 3.325 MPa. The maximum equivalent plastic strain of the dam body is located at the junction between arch walling and retaining wall on the upstream side. Numerical calculation and safety factor analysis show that the dam body has good structural stability and meets the purpose of underground reservoir construction and operation. References | Related Articles | Metrics

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Application and Practice of Project Functional State Method in Reservoir Dam Assets Evaluation WU Bo-qing 2022, 32(4): 8-14.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.002 Abstract ( )   PDF (938KB) ( )   The project functional state method is an asset evaluation method that the author, together with friends in the asset evaluation field, recently proposed to adapt to the characteristics of water conservancy projects. This method comprehensively analyzes and judges the future economic benefits of the appraised water conservancy project by reviewing the functional state, management work state, and upstream water and sediment state of the hydraulic structures of the appraised water conservancy project, and then calculates the value of the project assets, gives a relatively practical evaluation result, and illustrates the application of this method through practical cases. References | Related Articles | Metrics

Ecological Hydrology and Water Resources Column

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Representative Analysis of Baiyangdian Water Level YANG Feng-yuan 2022, 32(4): 15-20.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.003 Abstract ( )   PDF (1124KB) ( )   In the process of flood control in Baiyang Lake, the water level change trend at different locations in the lake is quite different, and the water flowing in and out of the lake is unbalanced, which brings troubles to flood control dispatching decision-making. Based on full and accurate hydrological monitoring data, this paper analyzes the representativeness and change rules of water level stations in the lake during normal and flood periods, and preliminarily reveals the main factors affecting the representativeness of water level. It provides a reference for how to use the water level of each point in Baiyang Lake more scientifically, and provides technical support for flood control dispatching and rainwater and flood resources utilization. References | Related Articles | Metrics

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Research on Early Warning Technology of Water Resources Carrying Capacity in Zhuolu County CHEN Xue-ying 2022, 32(4): 21-26.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.004 Abstract ( )   PDF (1132KB) ( )   Zhuolu County has carried out special research on early warning of water resources carrying capacity in order to establish a monitoring and early warning mechanism of water resources carrying capacity.Aiming at the current situation of water resources and development and utilization in Zhuolu County, this study adopts two means: factor evaluation method and analytic hierarchy process to objectively evaluate the current total water consumption of water resources, the exploitation of groundwater and the limited pollution in water functional areas. The evaluation result of factor evaluation method is that the evaluation conclusion of water quantity elements in Zhuolu County is in critical state, and the evaluation conclusion of water quality elements is in non overload state. The evaluation result of analytic hierarchy process is grade, and the comprehensive evaluation value is 0.813, which is between 0.8~1. Through the two evaluation methods, it is concluded that the water resources carrying capacity of Zhuolu County is in a critical state. References | Related Articles | Metrics

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Brief Exposition of Technologies of Development and Utilization of Water Used for Agricultural Irrigation in the Southern Mountainous Area of Naiman Banner SUN Feng-jun, HOU Zhan-hong 2022, 32(4): 27-32.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.005 Abstract ( )   PDF (1192KB) ( )   The water resources in the southern mountainous area of Naiman Banner, Inner Mongolia, are very scarce and unevenly distributed in time and space. Although its topography is complex, it occupies most of the cultivated land in the whole Banner. The monsoon and drought climate has intensified, causing the local agriculture to “rely on the weather for food for nine years”. The local water conservancy workers and the masses of the people have used many water resources development and utilization technologies in their years of practice and exploration. Through the elaboration and analysis of four classic technologies, such as small (2) type reservoirs and pond projects, subsurface flow interception projects, radial large-mouth wells, and mobile pumping stations, the paper demonstrates their economic and social benefits, which can effectively solve the practical difficulties of local agricultural water shortage, Alleviating and reversing the adverse situation of “nine droughts in ten years, relying on the weather” is an agricultural drought relief measure with strong vitality, which has a strong recommendation significance for agricultural irrigation in other similar regions in China, and is worthy of serious summary and continuous promotion and application. References | Related Articles | Metrics

Remote Sensing and Ecology Environment Column

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Land Use/Cover Change and Its Ecological Effect Evaluation in Xiong'an New Area Based on Remote Sensing WAN Hong-lin, SHI Xuan, ZHANG Tian-xing, HAN Wei, LAN De-mao 2022, 32(4): 33-39.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.006 Abstract ( )   PDF (1428KB) ( )   In view of the unclear impact of land use mode on ecological environment quality in Xiong'an New Area, taking Landsat TM/OLI remote sensing images in 2005, 2015 and 2020 as the main data source, using land use transfer matrix, analyze the quantity and direction of land use type transformation in Xiong'an New Area at different times is analyzed, RSEI model is established, and the temporal and spatial characteristics of ecological quality in the study area are evaluated. The linkage relationship between land use and ecological quality is also discussed. The results show that from 2005 to 2015, the main transfer out types are cultivated land and water area, followed by forest land, and the main transfer type is construction land, which is mainly transferred from cultivated land. From 2015 to 2020, the main transfer out type is cultivated land, followed by forest land; The main transfer type is construction land, which is mainly transferred from cultivated land. The average values of RSEI in 2005, 2015 and 2020 are 0.52, 0.43 and 0.40, respectively. The overall ecological quality remained in the “general” state and tended to deteriorate. Spatially, the ecology in the west of Xiong'an New Area was better than that in the east, and the area with better ecological quality was mainly Tanghe River basin in the southwest of Anxin county. The typical contribution of land use types to ecological quality is that when the surface is covered with vegetation, the RSEI index is high; and when the surface is covered with bare land or construction land, the RSEI index is low. References | Related Articles | Metrics

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Research and Practice of High Efficiency Cyclone Dust Removal and Defogging Technology LU Rui-juan, GUO Xing-li, QI Xue-zhong, LIU Yong-li, ZHANG Xin-meng 2022, 32(4): 40-44.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.007 Abstract ( )   PDF (1248KB) ( )   In view of the contradiction between the old dust removal equipment and the increasingly strict pollutant discharge standard in steel, thermal power, smelting, building materials, brick kiln and wet flue gas industries, and after analyzing the characteristics of the wet flue gas industry, a new generation of efficient cyclone dust removal and fog removal system is studied. The system can be upgraded based on the existing waste gas treatment facilities. The improved system can greatly improve the removal effect of fog droplets, aerosols, various salts and particles in the waste gas. And it can not only meet the emission standards of pollutants but also save the investment cost and operation cost, and solve the practical problems for enterprises without adding land area. References | Related Articles | Metrics

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Application of Soil and Water Conservation Ecological Restoration Technology in Water Conservancy and Hydropower Projects ZHANG Ke 2022, 32(4): 45-48.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.008 Abstract ( )   PDF (1189KB) ( )   With the continuous progress and development of China's infrastructure, water conservancy and hydropower projects are increasing year by year. However, while using water conservancy and hydropower projects to develop the national economy and enhance national strength, water conservancy and hydropower projects have caused negative impacts and even damage to the surrounding environment and soil and water ecology, so it is important and necessary to use ecological restoration technology to achieve soil and water conservation in water conservancy and hydropower projects. This paper elaborates and analyzes the ecological restoration technology and its application value, the analysis of the characteristics of soil erosion in water conservancy and hydropower projects, the analysis of the main causes of soil erosion in water conservancy and hydropower projects, the analysis of ecological restoration technology of soil and water conservation in water conservancy and hydropower projects, and the specific application strategies of soil and water conservation ecological restoration technology in water conservancy and hydropower projects. References | Related Articles | Metrics

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Degradation of Acetanilide Wastewater by Ultrasonic and Ultraviolet Synergetic Catalytic System ZHONG Xian-jin, WU Jun-wei, WANG Wen-yu, FANG Li-bo, WANG De-shun 2022, 32(4): 49-53.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.009 Abstract ( )   PDF (1570KB) ( )   Acetanilide in water was degraded by ultrasonic wave(US)-ultraviolet light(UV)synergetic catalytic system with TiO2 nanoparticles as catalyst.Various factors affecting the degradation efficiency of acetanilide were investigated. The results showed that the concentration of nano-TiO2 was 0.08g/L and the concentration of acetanilid-e was 0.25 g/L, solution pH 6.00, light intensity 100 μw/cm2, reflux pump flow 1L/min, ultrasonic vibrator freque-ncy 15kHz, ultrasonic power intensity 0.33 w/cm2, acetanilide degradation efficiency up to 85.31%. The combined degradation system of ultrasonic wave and photocatalysis has synergistic effect, and the reaction process followed the kinetic first-order reaction. References | Related Articles | Metrics

Computer Application and Automatic Control Column

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Grain Condition Remote Monitoring System Based on Lora WANG Lu, LIU Hui, LI Yan, ZHANG Li-juan, LI Shu-sheng 2022, 32(4): 54-59.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.010 Abstract ( )   PDF (1587KB) ( )   Food security is a major livelihood issue, and the detection of grain situation is of great significance. In order to solve the problem that wired communication is difficult to wire and expand, a remote monitoring system of grain situation based on LoRa was designed by using LoRa wireless communication technology, embedded technology and software development technology. STM32, as the core module of the acquisition module, uses LoRa wireless network to upload the collected temperature and humidity data to the upper computer, and uses Delphi language to develop the monitoring software of the upper computer, so as to display, store and analyze the data. The actual operation proves that the system is stable, reliable, simple to operate, capable of collecting multi-point temperature and humidity information in real time, which can meet the requirements of grain situation monitoring in grain depots. References | Related Articles | Metrics

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Internet of Things Anomaly Attack Detection Method Based on Improved DNN ZHANG Si-han, JIANG Jiu-chao 2022, 32(4): 60-66.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.011 Abstract ( )   PDF (1905KB) ( )   In order to solve the problem that the accuracy of traditional Abnormal attack detection model of Internet of Things is insufficient when training samples are insufficient, decision tree (DT) is introduced to improve the deep neural network (DNN) model. The addition of decision tree makes it easier to obtain the optimal salient feature set when DNN conducts and features extraction. At the same time, features can be summarized through decision tree, and new features can be inferred through DNN's perceptual learning ability, enabling the model to identify more Internet of Things behaviors. At last, the improved model is validated by computer simulation performance, and the results show that the DT - within DNN model can attack of black holes, DDoS attacks and other Internet attack testing, and testing has relatively higher precision and recall rate and F1 score, proved that the detection model can be applied to a variety of Internet of things attack type testing, has a certain practicality. References | Related Articles | Metrics

Road and Bridge Engineering Column

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Design and Construction Technology of Switch Beam of Passenger Dedicated Line LI Cai-feng 2022, 32(4): 67-71.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.012 Abstract ( )   PDF (1500KB) ( )   The construction of simply supported continuous prestressed beam bridge can effectively avoid many problems of cast-in-situ construction, and has obvious advantages in the application of railway bridge. Relying on the Majiashan bridge project of the newly-built Baoji Lanzhou passenger dedicated line, the bridge design and construction scheme of simply supported turnout beam followed by continuous prestress are analyzed. Reasonable calculation parameters and loads are selected in the design. The static analysis and calculation in the construction stage and operation stage are mainly checked, including the strength, crack resistance, stress, and deformation natural vibration characteristics. In the construction stage, the bridge construction technology of simple support before continuous prestress of turnout beam is studied, and the key points of construction technology are analyzed in detail. The results show that the proposed design method and construction control points provide an effective guarantee for the smooth completion of Majiashan bridge. The research results can be applied to the design and construction of turnout beam of passenger dedicated line. References | Related Articles | Metrics

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Supporting Scheme Design of Cofferdam for Deep Foundation Pit of Baiyin Yellow River Bridge WANG Li-juan 2022, 32(4): 72-78.  DOI: 10.16046/j.cnki.issn2096-5680.2022.04.013 Abstract ( )   PDF (1784KB) ( )   Considering the deep foundation pit depth, geological condition, surrounding environment and construction period of Baiyin Yellow River Bridge, the supporting scheme of larsen steel plate foundation pit is scientifically selected. The construction scheme of drainage excavation, bottom sealing and then removing the bottom enclosing purlin structure reduces the bottom sealing thickness and ensures the one-time overall pouring of the cap. The calculation of the support structure with lizheng professional pit software shows that the stress, displacement and anti-uplift of the main support structure all meet the requirements. In addition, the calculation results of enclosing purlin structure by Midas software also meet the requirements. The construction practice shows that the measured deformation value of steel sheet pile is close to the theoretical calculation value, which fully shows that the calculated results are in good agreement with the actual engineering, and the simulation calculation can be used to guide the construction, providing a successful case for the bridge deep foundation pit supporting engineering with similar geological conditions and limited time limit. References | Related Articles | Metrics