Journal of Hebei University of Water Resources and Electric Engineering

Research on Evaluation of Light Compaction Effect of Reed Reinforced Soil

LU Wei, REN Yongwang, XU Hunan, SONG Xinghai, JIN Kanhui

2024, 34(2): 1-7. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.001

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This article carried out a series of experimental studies on the strength and deformation of saline soil in Bohai New Area. First, the saline soil in the Bohai New Area was evenly mixed with reeds of different lengths and reinforcement rates, and a light compaction test was carried out based on a certain compaction power. Then, in order to test the compaction effect, it was subjected to an unconfined compressive strength test. The test results show that the mass reinforcement rate has a significant impact on the test results. The maximum dry density will gradually decrease as the reinforcement rate increases. The decrease range is between 0.01 g/cm³ and 0.02 g/cm³ per level. At the same time, the mass reinforcement rate also has a great influence on the optimal moisture content. The optimal moisture content will increase as the reed content increases. This trend will decrease as the reinforcement rate increases. When the mass reinforcement rate reaches 0.3%~0.35%, the maximum difference between the optimal moisture contents is only 0.38%. At this time, the influence of the reed content on the optimal moisture content can be ignored. Similarly, the length of reinforcement also has a significant impact on the compaction test. As the maximum dry density of reed-reinforced soil decreases with the length of reinforcement, the dry density will gradually decrease in a nearly linear trend. The dry density decreases by approximately 0.01~0.02 g/cm³ at each level of reinforcement length. When the reinforcement length is small, the optimal moisture content shows a nearly linear growth trend with the reinforcement length. When the reinforcement length reaches 50 mm, the change of the optimal moisture content is relatively stable due to the influence of the reinforcement rate. When the reinforcement length is too long, Excessive mass reinforcement rate may lead to a decrease in the optimal moisture content. The most obvious position appears at the length of 70 mm and the reinforcement rate of 0.35%. According to the unconfined compressive strength test, we can regard the reed reinforcement length as 50 mm and the mass reinforcement rate as 0.25% as the optimal reinforcement length and mass reinforcement rate.

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Building Solid Waste Recycled Concrete Carbonation Resistance Research

ZHANG Xuanming, LIU Mingyang

2024, 34(2): 8-12. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.002

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By using orthogonal experimental method, the carbonation resistance of recycled concrete with waste concrete as coarse aggregate was studied, with water cement ratio, replacement rate of recycled coarse aggregate, and fly ash content as influencing factors. Intuitive analysis method is used to analyze the carbonization depth of different factors at different ages, and range analysis method is used to determine the overall optimal level combination. The results indicate that under the influence of a single factor, the increase in water cement ratio, replacement rate of recycled coarse aggregate, and fly ash production will all increase the carbonation depth of recycled concrete based on building solid waste. Among them, the water cement ratio has the most significant impact on the carbonation depth of building solid waste and recycled concrete. When the water cement ratio is 0.5, the replacement rate of recycled coarse aggregate is 25%, and the fly ash content is 10%, the carbonation resistance of the recycled concrete based on building solid waste is the best.

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Research on Slope Support Construction Technology for Road Reconstruction and Expansion in Complex Geology

LI Yanyan

2024, 34(2): 13-18. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.003

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In order to solve the problems of effective protection and safe excavation in the construction of complex geological slope support, the construction technology of slope support for road reconstruction and expansion is proposed. Lizheng software is applied to repeatedly calculate slope support and various parameters under excavation height, and a series of data are obtained. A reasonable calculation formula is obtained for the optimal cutting height of support through the non-linear fitting function of multiple functions in Matlab. After determining the optimal cutting height and reasonable slope surface shape, the road to expand the slope is excavated, geological information isdynamically obtained, and the limit equilibrium method is applied to implement dynamic stability evaluation of the slope. Based on the evaluation results, advanced support for road reconstruction and expansion slopes is implemented, and optimized support schemes for unstable slopes are proposed. After verifying its rationality through numerical analysis methods, the support plan will be implemented and the next stage of excavation operations will proceed. Stable slopes will directly proceed to the next stage of construction. The application results show that one month later, the deformation in the X, Y, and Z directions is less than 2.5mm, achieving good construction results.

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Influence of Vehicle Load on the Cracking of Prestressed Large Cantilever Cover Beams

HOU Ronghe

2024, 34(2): 19-26. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.004

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With the continuous increase of road vehicles and the service life of concrete cover beams, cracks have appeared in some bridge cover beams. Taking a bridge in Shijiazhuang as an example, by studying the possible impact on bridge cracking during the operation phase, the influence of vehicle load location, vehicle load size, and superstructure form on cracking of the large cantilever prestressed concrete cover beam under vehicle load is studied. The comparison is made with the bridge without vehicle load to determine the degree of impact of vehicle load on the cracking of the cover beam. The results show that the closer the vehicle load position is to the cantilever end, the greater the tensile stress of the cover beam, and the more severe the structural deflection. When the right lane experiences severe overloading, compared to the simultaneous overloading of the left and right lanes, the change in tensile stress is smaller, but the deflection of the cover beam is larger, about twice that of the overloading of the left and right lanes.

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Stability Analysis of Curved Bridge Swivel Construction

GUO Yachun

2024, 34(2): 27-31. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.005

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When a curved bridge constructed using the rotation method suddenly stops during rotation, the bridge will withstand inertial forces, self-weight, and wind loads, which may cause significant deformation and local structural instability, leading to engineering accidents. On the basis of stability research on swivel construction, the main consideration is the influence of rotational speed and wind speed on the out of plane stability coefficient of the bridge. Taking a railway crossing an existing railway as an example, the out of plane stability coefficient of the bridge is taken as the control objective during the swivel construction process. Through stability theory analysis, equations between rotational speed and out of plane stability coefficient, as well as equations between wind speed and out of plane stability coefficient, have been established during the swivel process. The results show that when the rotational speed is low, the wind speed has a greater impact on the stability of the rotating system, while when the rotational speed is high, the wind speed has a smaller impact on the stability of the rotating system. When the wind speed is low, the emergency stop time has a greater impact on the stability of the rotating system, while when the wind speed is high, the emergency stop time has a smaller impact on the stability of the rotating system. To ensure the safety of the rotating construction process, the rotational acceleration should not exceed 0.1°/s² when the wind speed is less than 8 m/s. When the wind speed is 8 m/s-18 m/s, the impact of the speed on the external stability coefficient k₂ is relatively small, and the speed can be controlled within 0.01 rad/s while ensuring safety.

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Pre Arch Control Technology of Double Layer Bailey Beam Support Method for Cast-in-place Simply Supported Box Girder

JI Zhimeng

2024, 34(2): 32-36. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.006

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With the widespread application of the Bailey beam support method in the construction of cast-in-place box girders, especially in the design of double layered Bailey beams with single span when crossing existing highways and rivers, it is particularly important to control the pre arch degree based on the pre compression test. In this article, combined with the pre compression test of the double layered Bailey beam support method for the Yingpanshan Bridge on the Menghua Railway, we will elaborate on the process, purpose, and significance of the pre compression test. By organizing and analyzing the preloading data, the required pre arch degree for the template was determined, providing a basis for guiding the construction of box girder concrete pouring. It is hoped that this can provide some reference experience for similar bracket construction in the future.

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Analysis of Tilting Mold Construction Technique for High Pier of Super Large Bridge

LI Wei

2024, 34(2): 37-41. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.007

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In order to further study the construction technology of high pier of super large bridge, taking the Taipeng section LJ08-2 of Yinkun Expressway as an example, the implementation points and results of high pier construction of super large bridge are analyzed. In view of the key links and difficulties in the construction of high pier of super large bridge, effective construction measures are adopted. The practice shows that the construction of the high pier of the super bridge can be completed efficiently by using the large fixed steel formwork (tilting mold) as the means of forming the high pier of the super bridge, controlling the formwork lifting and concrete pouring, and controlling the line shape of the high pier. And to achieve the goal of 100% quality acceptance, saving the comprehensive benefit of 124,800 yuan for the enterprise, not only ensures the construction progress and safety of the large bridge high pier, but also achieves good economic and social benefits, which has reference value and application guidance significance for similar projects.

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Reverse Construction Technology of Super-large Tonnage Weakly Correlated Suspended Steel Structure

ZHU Zhihua

2024, 34(2): 42-48. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.008

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The weakly correlated suspension structure, which directly suspends each floor to the roof steel truss through steel tie rods, is a new type of structural system. If its construction is carried out by using the conventional method, there are many hidden dangers. Therefore, this article proposes a steel structure reverse construction technology method based on the construction characteristics of a large-span weakly correlated suspension steel structure system. This article focuses on introducing the construction process methods of hydraulic synchronous overall lifting and reverse splicing for the project, explaining the lifting results of the suspension structure through finite element simulation calculation, and providing support for the construction of weakly correlated suspension steel structures. The technical exploration in this article has certain promoting significance for the development of construction technology for large and complex steel structures in China.

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Development and Application of Photovoltaic Power Generation and Solid Heat Storage Combined Heating System

PEI Wenhao, JIA Hongyuan, YAN Mengzhe, DU Haohao

2024, 34(2): 49-53. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.009

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On the basis of promoting the joint application of solar energy and conventional energy, this paper proposes a photovoltaic power generation and solid heat storage co-heating system, and takes an enterprise in Zhangjiakou as an example to design a combined heating system. Using the solar radiation data of Zhangjiakou Meteorological Station collected by Meteonorm, the power generation of the company's photovoltaic system was simulated and combined with solid heat storage. Through the comparative analysis with its original heating system, it is found that the photovoltaic power generation and solid heat storage combined heating system can be profitable in the first two years, and the operating cost in the 25th year is 128,000 yuan, which is much lower than the original heating system, and can also reduce the emission of pollutants.

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Research on Seepage Prevention of Ash Yardin Soft Soil

ZHAO Jingyi, WANG Biao , RAO Junyong

2024, 34(2): 54-58. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.010

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To study the seepage prevention of ash yard in soft soil, analyse the influence of settlement to the the seepage prevention, taking an ash yard in Southeast Asian country as the engineering example, a coupled analysis model of seepage field and stress field is formed by Geo-studio. By simulating the actual surcharge scheme of ash yard, the settlement of different area at different time are obtained. The results show that the maximum differential settlement in this project is 3.7m, the seepage prevention in this area should be focused on. Based on the seepage flow of 1.5mm high density polyethylene(HDPE), the 10m vertical cutoff wall cannot meet the requirement. Only when the flow channel has be cut, the vertical cutoff wall can meet the requirement, but it requires a higher cost.

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Research on the Current Status and Effectiveness Evaluation of Water-saving Society Construction in Hebei Province

LAN Hongkuan, WANG Fengchun , CHENG Huaifeng, TIAN Shupeng

2024, 34(2): 59-66. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.011

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Implementing the policy of water saving priority is and will be the guiding principle for water management in China. The principal component analysis method and data comparison were used to study the effectiveness and influencing factors of water-saving society construction in Hebei Province. Some suggestions were put forward. It was found that the evaluation index of water conservation effectiveness in Hebei Province was at the middle and upper level, and the main factors affecting the water use of various industries included the effective irrigation area, cement and coke yield, completed area of residential buildings, and the green coverage of built-up areas,etc. Some suggestions were put forward based on the water-saving status, such as optimizing and adjusting the structure of crop varieties, developing efficient water-saving irrigation, adjusting the industrial structure, eliminating backward production capacity, building smart water management platforms, and improving public' awareness of water conservation.

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Research on the Activation and Regeneration Strategy of a Commercial Space in a Square in Tianjin

ZHOU Shiqi, WANG Moyu, LIU Dandan

2024, 34(2): 67-71. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.012

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With the continuous development and improvement of cities, the renewal and renovation of old urban spaces have gradually become an unavoidable problem, including the redevelopment of certain urban areas, the improvement of urban facilities and buildings, the protection and reuse of historical blocks and buildings, and the micro renewal of urban community spaces. At the same time, there are many different types and directions in the practical level of urban renewal, each with its own uniqueness, such as the utilization and transformation of urban industrial heritage, the activation and regeneration of urban commercial space, and the renewal and transformation of urban cultural space. The specific strategies and methods for dealing with different types of updates and renovations will vary. But the ultimate goal is to enable these spaces to meet current and future usage needs, improve spatial quality, optimize experience, enhance regional vitality, drive economic growth, and drive urban development. From the perspective of art and design, combined with the case of activation and regeneration of a commercial space in a square in Tianjin, the article proposes the difficulties in the process of updating and activating, as well as the importance of operating art and design content.

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Design of Sewage Automatic Control System Based on KingView 7.5

LI Xiaoyan

2024, 34(2): 72-76. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.013

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The system uses KingView 7.5 configuration software as the development platform, s7-300 PLC as the core of the system. Various sensor signals in the field equipment layer was acquired by distributed I/O, and after filtering, amplifying, A/D conversion and other operations, the signals are transmitted to the upper computer through the Ethernet. Using the CPU314C-2PN/DP of Siemens S7-300 PLC series as the central control equipment, the automatic control of sewage treatment system and real-time monitoring of detection parameters and running parameters was realized,and the system equipment running status and automatic fault alarm can be recorded.This control system uses industrial computer to remote control the sewage treatment system, which can monitor the sewage treatment process intuitively and dynamically. It has the advantages of low cost, highly automatic, stability, reliability and easy maintenance.

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Design and Implementation of Self-study Room Platform Based on Springboot and Uni-app Framework

LI Jinzhong, HU Zhiming, CHEN Jiangang, CHEN Hanxuan, ZUO Zuo

2024, 34(2): 77-82. DOI: 10.16046/j.cnki.issn2096-5680.2024.02.014

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At present, domestic education has begun to popularize online learning mode on a large scale. However, many existing online learning platforms gradually appear the problem of excessive entertainment and social seriousness, which seriously violatesthe original intention of the birth of online learning platforms. In addition, the platform has relatively limited functions, making it difficult to comprehensively manage the learning status of users, and there is also a considerable shortage of products on the market that meet users'needs. Therefore, this paper designs and develops a mobile self-study room platform based on SpringBoot and Uni-App frameworks, which is specially designed to provide users with learning state management services. The main functions of the platform include five functional modules: self-study state management, learning dynamic management, leaderboard, notepad, and user information management. The platform can provide users with a series of learning state management services to help them develop a good learning self-control, cultivate students' independent learning ability, and improve learning efficiency.

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