Journal of Hebei University of Water Resources and Electric Engineering

Application of Comprehensive Geophysical Exploration Method in Leakage Detection of Levee

Liu Jin-peng, Wang Zhi-hao, Tang Ke-xuan, Zhang Mei-duo, Liu Kang-he

2023, 33(4): 1-7. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.001

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Geophysical detection method is an effective method for non-destructive testing of levees, but each geophysical detection method measures a single physical parameter, such as resistivity value, potential value, seismic wave velocity and so on. There are limitations and multiple solutions in geological interpretation when using a single parameter. This paper introduces the basic principles, advantages and disadvantages of common used geophysical detection methods for hidden dangers of levees, and discusses the application of comprehensive geophysical methods in identifying hidden dangers of levees leakage through engineering examples, which can be used as a reference for similar projects.

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Fuzzy Fault Tree Analysis Method for Dam Failure Probability

HUANG Meng-jing

2023, 33(4): 8-13. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.002

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In order to quantitatively analyze the probability of dam failure and provide decision-making basis for dam risk analysis and evaluation, this paper integrates fuzzy set theory into the fault tree analysis method, studies the fuzzy fault tree analysis method of dam failure probability, specifically analyzes the traditional fault tree analysis method, fuzzy set theory, triangular fuzzy number method, and basic event probability determination method, clarifies the analysis process of the fuzzy fault tree analysis method of dam failure probability,and analyzes the dam failure mode.Finally, taking the calculation of the failure probability of an earth-rock dam as an example, the causes of the dam failure were analyzed in depth, and the top event, intermediate event, and basic event were identified. A fuzzy fault tree analysis model for the dam was established, and the probability of each basic event was triangulated and normalized. The comprehensive determination of the dam failure probability can provide a reference for the next step of risk assessment.

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Exploration on Information Construction and Application of Rural Drinking Water Safety Project

CHEN Xue-ying

2023, 33(4): 14-20. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.003

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In order to explore the information construction mode of rural drinking water safety in Hebei Province, solve the problems of relatively complex water resource conditions, dispersed population, significant gap between the overall level of water supply facilities and cities, and labor-intensive, costly, and inefficient management work in rural areas. the research team and professional technical team adopt the idea of “comparing internal and external factors to supplement cohesion”, put forward the overall work framework and platform functional framework, and on this basis, build an information management platform in the way of “Internet plus” to achieve informationization and reflect integration and modernization. This study is in line with the requirements of building a moderately prosperous society in all respects, and has very important practical significance for improving the construction and management level of rural drinking water safety projects.

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Internal Defect Treatment and Technological Comparison of Soil Tunnel in a City Water Conveyance Channel Project

FU Ke

2023, 33(4): 21-25. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.004

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This paper takes the soil tunnel of a long-distance water transmission channel project as the research background, in which the operation life of the tunnel continues to increase, the soil tunnel keeps running at full load for a long time, and there may be leakage, cracks, erosion pits, insufficient strength of concrete components and excessive deformation inside, which will affect the normal operation of the whole channel. Through the field investigation, the artificial investigation and detection of hidden dangers inside the tunnel, cracks, leakage, erosion pits and other defects and problems in different degrees inside the tunnel were found. According to the classification of defect problems, three different construction methods, technological processes and repair materials were used to carry out professional repair of the three types of defects found inside the tunnel, and the effect evaluation was carried out. Finally, good results were achieved. At the same time, advanced technologies such as surface wave method, ground penetrating radar and three-dimensional laser scanning technology are further introduced and adopted to clarify the “recessive” defects existing in the tunnel and establish a tunnel safety monitoring system, so as to provide a scientific basis for the treatment of internal defects in the tunnel at the later stage. It has certain guiding significance to the engineering management of a long distance water transmission channel engineering management department.

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Research on Application Technology of Prefabricated Steel Structure Distribution Room

ZHOU Ting-ting

2023, 33(4): 26-31. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.005

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In order to actively implement the overall deployment of the “Action Plan for Carbon Peak before 2030” issued by the State Council, the use of prefabricated steel structure construction technology system to replace traditional reinforced concrete construction technology system has great advantages in saving highly polluting cement materials, reducing construction process pollution, and reducing carbon and energy conservation.With the rapid development of civil and public buildings, relying on the distribution rooms in residential areas, research has been conducted on the production and installation technology of prefabricated steel structure flat steel pipe columns and concrete pouring technology. By analyzing the difficulties in the production and installation of rectangular flat pipe columns, targeted design has been made for the rectangular flat pipe column production and installation control plan, which includes production control points, welding stress relief measures, and production and installation guarantee measures.In response to the difficulties in controlling the compactness of concrete pouring, a construction plan for rectangular flat pipe column concrete pouring has been formed, including a construction technology desktop meeting and technical disclosure system, the concrete pouring process flow, and the main standards for quality control of steel column core pouring concrete.The system scheme formed by this study can be used to guide the production, installation, and concrete pouring construction of prefabricated steel structure rectangular flat pipe columns. It has achieved great results in the construction of residential distribution rooms and can be promoted and applied to civil residential and public buildings. It provides guidance for design and construction personnel, and has advantages such as shortening construction cycles, saving materials, and improving construction quality, especially in terms of energy conservation and carbon reduction.

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Research on Capacitive Current Detection Method Considering Transient Process

ZHOU Rui, XIA Jun-ya, ZHENG An-yu, HOU Yi-xiang

2023, 33(4): 32-37. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.006

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For the resonant grounding system, the equivalent circuit of current source form is drawn, and a capacitive current detection method to ground based on the transient process is proposed to serve the tracking and tuning of arc suppression coil. The method derives the calculation method of capacitance to ground by disconnecting the neutral tuning loop, measuring the time constant of the transition process and the amplitude of the electric quantity after the circuit is stabilized. A model is built in Matlab to verify the method. The simulation data verifies the effectiveness of the method. The measurement method is simple, the calculation is easy, the measurement time is short, and the calculation accuracy meets the requirements. It provides a theoretical basis for measuring capacitance based on transient process for arc suppression coil tracking and tuning.

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Application of Single-circuit T Angle Steel Tower in 110kV Transmission Line Design

Li Qian-fei, Ma Li

2023, 33(4): 38-41. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.007

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Combining with practical engineering, this article introduces the application effect of using single circuit tension angle steel towers for T connection of transmission lines in the design of 110kV overhead transmission lines. Another set of wire cross arms were added vertically below the lower side of the wire cross arm of the ordinary single circuit “干” shaped tension angle steel tower, and a “cross” arrangement was formed. By adding a set of wire cross arms, the T-connection problem in overhead transmission lines was achieved on a single circuit tension angle steel tower. During the T-connection process of transmission lines, the wires are always arranged in a triangular pattern, and the force acting on the angle steel tower structure is more reasonable. By selecting the T connection method of the transmission line reasonably, the design scheme is made more reasonable. While significantly saving the land occupied by the angle steel tower, the corresponding engineering economic and technical indicators are better, and the power outage time of the transmission line is shorter, making construction operations more convenient.

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Hydration Heat Control Scheme and Simulation Analysis of Caijiazhuang Bridge Pier Cap Construction

WANG Cheng-ren

2023, 33(4): 42-47. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.008

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Combined with the Caijiazhuang super major bridge engineering project, according to the preliminary calculation of cap hydration heat and cap shape, the cooling water pipe is scientifically arranged. According to the regulations of mass concrete specifications, MIDAS software is used for hydration heat simulation analysis, and the temperature field inside the cap and the concrete stress distribution cloud map are obtained. According to the calculated temperature field distribution, a miniature wireless temperature sensor is arranged inside the cap, and the number of sensors is appropriately increased in the high temperature area and low temperature area. Through continuous data observation for 5 days after the cap pouring, the maximum temperature difference of measuring points is 23.6 degrees, which is highly consistent with the simulation results and meets the requirements of the specification. After testing, no cracks appeared in the cap, which indicates that the hydration heat simulation analysis can reflect the actual situation and ensure the construction safety, which provides references for similar cap reinforcement construction hydration heat control.

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Research on Restrained Torsion Effect of Continuous Box Girder Bridge with Variable Cross-section under Moving Load

WANG Wei

2023, 33(4): 48-52. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.009

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In order to study the characteristics of stress distribution and deformation of box girder bridge with variable cross section, the element stiffness matrix of box girder with variable cross section is derived based on the restrained torsion differential equation of box girder.Based on the analysis of the project, three load distribution conditions are set up, and the bending moment and warping displacement of box girder with variable cross-section are calculated, the stress amplification effect is also studied.The results show that the curves of moment changing with longitudinal distance in case 1 and case 2 are similar and show “W” shape.In condition 3, the trend of change was just opposite, myopia presented “M” type, and both the value and the range of change were small.The warping displacements are mainly concentrated at the end and the middle of the side span, and show an anti-symmetric distribution with the mid-span section as the boundary.In case 1 and case 2, the values of the generalized warpage displacement in mid-span and right-span are basically the same.The curve of warping double moment shows the law of attenuation from the peak point to the two sides, and the extreme value appears at the position of the center fulcrum and the action point of the concentrated load.The maximum normal stress of warpage occurs in the section under the action of concentrated load. The stress magnification coefficients of the four control sections are less than 1.41 under three loading conditions.

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Discussion on the Technology and Safety Protection Measures of Hanging Basket Construction Across Freeways

JIN Da-zhi, LU Cheng-ming, LU Nan

2023, 33(4): 53-57. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.010

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In the construction of highway bridges, the hanging basket construction technology has been widely used, but in some special geographical environments, this method still needs to overcome various difficulties and challenges. This article provides a detailed introduction to the design scheme, installation steps, and construction process of the hanging basket for an overpass highway bridge construction case, and explores the safety protection measures during the construction of the overpass highway. The results indicate that during the construction of the cross highway range, protective brackets and protective nets are used to seal the mid span hanging basket. At the same time, a bottom protection platform is set under the main body of the hanging basket, which can effectively prevent scattered materials such as steel reinforcement heads, bolts and nuts, mortar, welding electrodes, welding sparks, small tools, etc. from falling into the traffic lane and prevent high-speed traffic safety accidents. By exploring the construction process and safety protection measures of hanging baskets in this article, solutions and ideas are provided for similar engineering project construction difficulties.

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Residual Stress Control of Orthotropic Steel Bridge Deck Based on Vibration Stress Relief Technology

CHEN Li

2023, 33(4): 58-63. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.011

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To minimize the welding residual stress in orthotropic steel bridge deck, and to assess the effectiveness of vibratory stress relief (VSR) applied in bridge steel structures, a full-scale model of orthotropic steel bridge deck was manufactured and its welding residual stresses were adjusted by using VSR. Thereafter, the welding residual stresses were measured by the blind-hole method to evaluate the effects of the procedure. The results show that the magnitudes of welding residual stress in the weld zone are significantly high, which are up to or higher than the material yield strength. After vibrating, the welding residual stresses have been reduced to below the material yield strength both in the weld zone on the deck plate and in the area on the weld surface. In addition, the residual stress field has become more uniform. If the stress level is much higher, the effect of VSR would be much better. After vibrating, the welding residual stresses in the area away from the weld are slightly increased, but still remain at a relatively low level. It is suggested to apply the VSR technology to adjust welding residual stresses for bridge steel structures.

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Practice and Thinking on the Construction of Water-saving Society in Ningxia

LV Wang, WANG Yan-hua, WANG Ai-bin, ZHANG Jing-xiao

2023, 33(4): 64-68. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.012

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The construction of water-saving society at the county level up to the standard is an important task deployed in the No. 1 central document of the central government in 2017. Carrying out the construction of water-saving society at the county level up to the standard is an important means to promote water-saving work and an important measure to implement the water-saving priority policy in the new stage. It is of great significance to promote the transformation of water use mode from extensive to economical and intensive, and improve the efficiency and efficiency of water resources utilization. This paper summarizes the work and experience of water-saving society in Ningxia, summarizes the construction achievements, combs out the problems in the construction of water-saving society, and puts forward countermeasures from the aspects of establishing departmental linkage mechanism, strengthening top-level design, improving relevant systems, improving the quality of water-saving carrier construction, and continuing to carry out in-depth water-saving publicity and education, which provides thinking and reference for further promoting the high-quality development of water-saving society in water deficient areas in the northwest.

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Reasearch on the Development Strategy of Electrical Energy Internet Under the New Development Pattern of “Dual Circulation”

LI Yan-yan, XIONG Yi

2023, 33(4): 69-75. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.013

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At present, the development goal of the electric power energy Internet has been transferred from pilot demonstration to diversified and large-scale development in China. Meanwhile,the Belt and Road Initiative (BRI) brings opportunities for common development to countries along the routes, and lays a preliminary foundation for the dual circulation of electricity and energy Internet. This article explores the value choices for the development of electric power energy Internet that not only adapts to the realistic conditions of the new stage of economic and social development, but also brings great benefits for China to integrating into the international environment, constructing the global energy Internet, and breaking through the bottleneck constraints of the development of electric power energy Internet.Under the new development pattern of “dual circulation”, the optimal development path of the electric energy Internet is as follows: building electric internet of things to connect people, material and information resources all over the region, building the global power energy internet to achieve the global power mutual benefit and sharing, relying on technological revolution to support the energy electric connectivity of BRI, bringing about the comprehensive utilization of energy with cooperation and openness, mutual benefit and sharing, and carrying out the strategic synergetic effect of the power energy internet and new development pattern of “dual circulation”.

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Analysis of Heat Source Transformation Scheme in a Certain Area of Xingtai City

YAN Meng-zhe, DU Hao-hao, JIA Hong-yuan, PEI Wen-hao

2023, 33(4): 76-82. DOI: 10.16046/j.cnki.issn2096-5680.2023.04.014

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Taking the heat source reconstruction project of a central heating area in Xingtai City as the research object, this paper conducts technical and economic analysis on the first station heating scheme of gas boiler, CO₂ air source heat pump and ground source heat pump. The results indicate that the ground source heat pump initial station heating scheme has the lowest energy consumption and the highest profit, and this project can adopt the ground source heat pump initial station heating scheme. This article can provide reference for the design of heat source renovation schemes in northern regions.

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