bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on mechanical effect of adjacent vertical prestressed tendons
Authors: Wu X G , Deng Q Y , Yin Y
Published: February 2021

The web cracking of continuous rigid frame bridge is still a common phenomenon. A part of the reason is that the vertical prestress does not work well. At present, the mechanical research of vertical prestressed reinforcement is not comprehensive, the mechanical effect between two adjacent vertical prestressed tendons is not thorough, theoretical analysis cannot be carried out through formula derivation, and finite element modeling is relatively dependent on, so the work is cumbersome and the application is not convenient. In view of this problem, this paper uses elastic mechanics theory to deduce the stress effect formula of two adjacent vertical prestressed tendons, and verifies the correctness of the formula through finite element modeling. In addition, this paper also uses the finite element theory to carry on the modeling calculation, obtains the distribution law of the web stress caused by the vertical prestress along the height of the web and the longitudinal direction of the box girder, providing guidance for the vertical prestressed design of rigid frame bridge.
A review of researches on fiber-reinforced solidified soil
Authors: Cheng Hu , Xingzhong Weng , Cong Liu , Junzhong Liu , Jie Liu , Yazhi Wei
Published: February 2021

At present, fiber-reinforced solidified soil is a research hotspot in the civil engineering field, but there are few related researches. Researches mainly focus on solidified soil and fiber-reinforced soil. Based on this, the research status of solidified soil and fiber reinforced soil is comprehensively analyzed in this paper. It is found that there is still a great lack of research on the strengthening mechanism of solidified soil. The research on the mechanism is still in the stage of qualitative description, and the related technical problems need to be further studied. Similarly, there are still great limitations in the research of fiber reinforced soil. These are reflected in the limited types of soil studied, more laboratory mechanical properties tests, but less research on fiber toughening mechanism.
Inversion analysis of the Three Dimension Geostress Field in A Tunnel
Authors: Ren-yongqiang  , Tang-Baoli  , Chen-Xiangmei  , Liang-Jianping
Published: February 2021

The initial geostress field is an important basis for the design and stability analysis of geotechnical engineering. The geostress field of the whole engineering area must be calculated by inversion analysis with the limited geostress data, because there are few measured geostress points. Based on the geological background of a tunnel in northern Hebei province and considering the influence of regional highly weathered, moderately weathered and slightly weathered stratum on the stress field, the 3D finite difference method and multiple linear regression method were used to calculate the three-dimensional geological model of the study region to get the optimal regression coefficient. It is found by comparing the regression value with the field measured value that the two values are equal in magnitude and close in direction, indicating that the geostress field calculated by regression is reasonable, then the distribution law of the geostress field in the study area is further analyzed on this basis. The results show that there is a stress concentration in the tunnel center, z peaking at 50m below the center, and decreasing in the left and right direction with a large stress gradient then getting out of the area of stress concentration and tending to be stable. The study area is a medium geostress area, based on gravity stress, the control effect of gravity stress field is gradually enhanced with the increase of buried depth. The research results have important value in the design and construction of tunnel in special geological conditions.
Study on discharge velocity of tailings mortar in dam break based on FLOW-3D
Authors: Hu Jiahao , Na Chengwei , Wang Yi
Published: February 2021

Tailings pond is used to store the tailings discharged from the mine after separation and mining. As a potential hazard source with high potential energy, the tailings mortar with high potential energy after dam break is transformed into high-speed dynamic energy sand flow to impact the downstream area through energy conversion. In this paper, through the establishment of a three-dimensional model of a tailings pond, the FLOW-3D software is used for numerical simulation, and the influence of correlation coefficient on the discharge speed of tailings mortar after dam break is analyzed, and the relevant migration law is obtained. The test in this paper can provide a reference for the corresponding disaster and protection engineering research.
Preparation of color modified emulsified asphalt and performance analysis of micro surface mixture in cold area
Authors: Yao Ailing , Wang Leiting , Yang Tao , Di Haidong , Li Jinpeng
Published: February 2021

In order to determine the color modified emulsified asphalt and its preparation process in cold areas represented by Hulunbuir, Inner Mongolia, a variety of materials such as saturated hydrocarbon A, petroleum resin B, copolymer C, copolymer D, and plasticizer E were selected to simulate four components of asphalt are used to prepare colored asphalt, and a colored modified emulsified asphalt suitable for cold regions is developed by the preparation process of emulsified asphalt emulsifying and modifying. The performance of the prepared colored modified emulsified asphalt was analyzed, and the optimal dosage range of modifier, emulsifier, stabilizer, and pH adjuster was determined, and the high and low temperature performance of colored modified emulsified asphalt was improved to adapt to environment of cold areas. Through the colored micro-surfacing mix design to determined the optimal emulsified asphalt dosage, and the test compares the surface performance and durability of the ordinary micro-surfacing mixture and the colored micro-surfacing mixture, which proves that the CMS-3 type mixture has good water sealing effect, anti-slip performance and ability of water damage resistance.
Study on the influence of bank slope soil deformation on wharf structure
Authors: An Xiaoyu , Wang Fei , Dianjun ZUO
Published: February 2021

After a large-scale construction period, there are a large number of old high piled wharfs in China’s ports. The pile cap piles and beam members of some wharfs close to the earth retaining structure appear obvious dislocation, and some of them are increasing year by year. In this paper, the typical section of Tianjin Port 16 ∼ 18 wharf is taken as the research object, and a three-dimensional mathematical model is established to simulate the deformation trend of wharf structure with bank slope soil under unbalanced load condition. The results show that the pile cap plays a positive role in the stability of the wharf slope. Partial load can cause the deformation of soil along the bank. The horizontal earth pressure acting on several rows of piles behind the pile cap is large, which leads to large deformation and internal force of the pile body. When the force between the pile top and the beam exceeds the lap strength between them, the pile top and beam will be staggered. The fundamental method to avoid or improve the seaward movement of high piled wharf and bank slope is to block or reduce the horizontal earth pressure from the rear storage area to the front. The scheme of sheet pile wall or bored pile can be selected according to the actual situation.
Stability and Bearing Capacity Analysis of Breakwater with Cylindrical Jacket & Pile Foundations
Authors: Zhang Lian Li , Ni Xiao Chang , Zhang Wen Wen , Tian Yu Feng
Published: February 2021

In view of deep water and soft soil foundation, a new type of breakwater with cylindrical jacket and pile foundations is proposed. According to the hydrological and geological conditions of Tianjin Port, the stability and bearing capacity of breakwater are numerically simulated by ABAQUS software. The results show that when the pile is an elastic model, the failure of soil is the main cause of structural instability. In the limit state, the structure is unstable in rotation in addition to arc sliding, and its turning point is below the bottom of the cylindrical jacket and deviates from the structural axis near the front-pile side. When the pile is a damage plastic model, the loss of bearing capacity is the cause of structural instability. The safety coefficient is greater than 1, but it is obviously smaller than the one of elastic model. The research results provide a reference for structural design and stability study of the breakwater with cylindrical jacket and pile foundations.
Model tests of geotextile in collapse treatment of karst subgrade
Authors: Wu Di , Luo Chen , Wu Jianjian
Published: February 2021

Subgrade collapse is widespread in karst areas of south China, which is easily causing economic losses and casualties. Compared with the traditional treatment methods, using geotextile has obvious advantages in treating the subgrade after karst collapse. In this paper, two scale model tests with different laying depth of geotextile used to treat karst collapse were performed. Instrumentations and particle image velocimetry system (PIV) were applied to investigate soil pressure, vertical displacement of filling and tension distribution of geotextile. Following results were found: from the point of view of soil pressure, compared with deep buried, there had not enough stable soil under the shallow buried geotextile to improve the collapse treatment effect effectively; Compared with using deep buried geotextile, shallow buried geotextile would cause a larger overall settlement with the surrounding fill, which reduced the reinforced effect and had unsatisfactory treatment effect. Therefore, the geotextile with deep layout should be used in the collapse control and the soil beneath it should be compacted to achieve a good treatment effect.
Feasibility Analysis of Replacing Partial Longitudinal Steel Bars with Layered Steel Fibers
Authors: Wang Yuying , Tang Jiajun
Published: February 2021

In order to study the feasibility of replacing part of longitudinal reinforcement with layered steel fibers, four-point bending tests were carried out on a group of ordinary recycled concrete beam and three groups of layered steel fibers recycled concrete beams. The cracking moment and ultimate moment, ductility and energy dissipation, deformation and deflection of the experimental groups with lower contents of steel fibers and higher reinforcement ratio and the experimental groups with lower reinforcement ratio and higher contents of steel fibers were compared and analyzed. The results show that it is feasible to replace some longitudinal bars with layered steel fibers when considering cracking moment, ultimate moment, elastic stage and working stage with cracks of load-deflection curve, while it is not feasible when considering ductility, energy dissipation and post-yield stage of load-deflection curve.
Analysis of the influence of the full-section method in the construction of shallow-buried unsymmetrical tunnels
Authors: Zhuang Dequan , Liu Qi , Bao Junchao , Ba Wenwen , Song Zhanping
Published: February 2021

Aimed at the construction stability of the shallow-buried and biased exit section of the Georgia No.3 tunnel under construction. Using numerical simulation analysis method, the displacement and deformation of the unsymmetrical rock wall and the construction dynamic characteristics of the supporting structure are studied. It points out the weak links that should be paid more attention to in the construction. Numerical analysis results show that the side of the unbiased rock wall is most affected by the excavation, and the maximum tunnel displacement on both sides appears at the arch waist. The protection of this part should be strengthened during construction. The smooth implementation of this project can provide reference for similar highway tunnel construction.
Predicting Maximum Crest Settlement of Concrete Face Rockfill Dams Using a New Ensemble Learning Model
Authors: Wen Lifeng , Zhang Haiyang , Li Yanlong
Published: February 2021

Deformation assessment and control are essential issues in the construction of concrete face rockfill dams (CFRDs). The design and construction of CFRDs require deformation behavior that can be estimated rapidly to support engineering optimization and safety assessment. Based on 87 case histories of in-service CFRDs, a new ensemble learning model has been developed to predict maximum crest settlement (CS) of CFRDs. The model is based on the support vector machine regression algorithm (SVR) combined with multiple variables, and then the foundation model is integrated by the weighted average integration method. It is demonstrated here that the new ensemble learning model weakens the nonlinear characteristics of case data, makes up for the instability of single regression algorithm, improves the generalization ability, and provides a new idea for predicting the CS of CFRDs.
Research on optimize design of pile foundations in collapsible loess areas
Authors: Di Shengjie , Lv Jiaojiao , Gao Xujun , Zhang Ying
Published: February 2021

Collapsible loess has the poor characteristics of obvious strength reduction after being soaked by water. The construction of towering structure in western China is threatened by the unfavourable geological conditions of collapsible loess. This paper analyses the foundation treatment, pile foundation optimization design of the towering structure in collapsible loess areas, provide technical support for the construction of towering structure in collapsible loess areas.
Experimental Study on Structure Water Support Interaction of Large Aqueduct
Authors: Li Chunlei , Zhao Lijun , Wang Haibo
Published: February 2021

Based on the large-scale shaking table model test of aqueduct, the interaction and influence of large-scale aqueduct structure-water-damping bearing were studied. Through the dynamic detection of white noise, the free vibration characteristics of aqueduct model under different working conditions were obtained. Based on the comparison of seismic responses of aqueduct under three conditions of water, half water and normal water level and two states of locking and releasing damping bearing, the influence of water quality and damping bearing on natural frequency, dynamic water pressure and dynamic strain of aqueduct structure was studied. By inputting Ricker waves with different frequencies, the correlation among the input wave frequency, the fundamental frequency of aqueduct structure and the frequency of water sloshing and the influence on the aqueduct response were studied. The experimental results show that with the increase of water quality, the interaction between water and aqueduct structure enhanced, which had a great influence on the fundamental frequency of aqueduct structure, and the influence of water level presented an obvious nonlinear. The hydrodynamic pressure decreased along the middle section elevation of the aqueduct, and the acceleration increased with the increase of the tank elevation, which reflected the complexity of the interaction between water and aqueduct structure. The results provide support for the seismic design of aqueduct and the application of shock absorption bearing.
The nonlinear dynamic analysis of sediment particles near river bed
Authors: Ma Fei , Zhang Chengjun , Shi Jianjun
Published: February 2021

According to the equation of discrete solid particles’ motion in arbitrary flow field, the dynamic characteristics and trajectories of sediment particles are discussed. The small disturbance method is used to analyze the stability of sediment particles at the equilibrium point, it is shown that the change of turbulence frequency will lead to the sudden change of sediment particles, under the condition of a certain periodic excitation amplitude; and under the condition of certain periodic excitation amplitude, the change of sediment particle size will also lead to the sudden change of sediment particle movement, All of the above prove that the movement of sediment particles near the river bed surface has a catastrophe.
Study on projects of bending shoal-cutting regulation for tidal river
Authors: Yun Liu , Gang Xu , Bin Wang
Published: February 2021

By taking bending shoal-cutting of Water Conservancy park in Lingjiang as a case, the change of flow pattern in the curved channel before and after the shoal-cutting project is analyzed by numerical simulation, and application effect is analyzed. By analyzing the tidal level data of the engineering reach, the appropriate barrier clearance elevation is determined. The relationship between water level variation and different range of shoal-cutting is established, and the suitable range of shoal-cutting is recommended. It has an important reference for the management of bend in tidal river.
Research on Relationship of Total Nitrogen Concentration and Runoff in the Xiangxi River Basin
Authors: Nie Yuxi , Zhang Qinghuan , Tong Sichen , Huang Guoxian , Sun Xianren , Tang Xiaoya
Published: February 2021

The response relationship between pollutant and flow rate is very important and is one of the key factors for the reasonable simulation of the model for a basin. The basin land use type, soil types, weather, vegetation distribution, soil and water loss situation are taken as the influence factors to explore its concentration change in migration of pollutants in relation with the response of the flow in Xiangxi River watershed. Emphasis was put on the effects of nitrogen pollutants based on the mass conservation equation combined with the total nitrogen concentration of pollutants. Relationship between total nitrogen pollutants and flow of three types of response relation is preliminary established. Measured data of total nitrogen from 2014 to 2017 are used for verification and error analysis. Results show that the power function is the best relationship, while the logarithm function is the second one, and the exponential function is the third one through trend coincidence, fluctuation range and error analysis. This study is helpful to understand the response relationship between pollutant concentration and discharge in small watershed, so it can also be used for pollutant prediction in small watershed without measured data.
Study on annual rainfall forecast of Xishan station in Wenzhou City
Authors: tong-Lin  , haiping-Yang  , huifang-Guo  , yenan-Zhang
Published: February 2021

Wenzhou city is Located in the southeast of Zhejiang Province, it belongs to subtropical climate. The main factors that affect the climate in Wenzhou include strong solar radiation and the regulation of marine water body. The annual variation of rainfall in Wenzhou City is very large. The disastrous weather in Wenzhou mainly includes typhoon, rain and drought. The ways of Typhoon Affecting Wenzhou include direct landing and adjacent area landing. Direct landing is more harmful. Rainfall is the most important factor affecting flood and drought disasters in Wenzhou City, so the analysis of rainfall can provide a reference for flood control and drought relief work in Wenzhou City. In this paper, BP neural network method is used to analyze and forecast the rainfall of Xishan station in the main urban area of Wenzhou City. The results show that the precipitation in Wenzhou City will change greatly in the next ten years. Flood disaster may occur in 2022 and 2028, and drought may occur in 2023.
Design and Operation Characteristics of the Horizontal Swirl Flood Discharge System
Authors: Zhou Heng , Liu Jing , Di Shengjie , Lu Xi
Published: February 2021

It is one of the effective methods to increase the reliability of flood discharge buildings with high water head and reduce the project cost to transform the diversion tunnel of temporary buildings into permanent spillway by using the horizontal swirl flood discharge system. Based on Gongboxia hydropower station and combined with prototype monitoring, this paper studies and analyzes the key points of shape layout, structural characteristics and operation effect of horizontal swirl flood discharge system, the results show that the horizontal swirl flood discharge system has strong adaptability to topographic and geological conditions, good energy dissipation effect and hydraulic characteristics, stable inlet and outlet flow pattern, stable cyclone cavity, no obvious signs of adverse negative pressure and cavitation erosion, no adverse structural vibration and dynamic response, and safe operation of the spillway tunnel.
Dewatering control of foundation pit under the condition of failure of water-stop curtain
Authors: She Jiabei
Published: February 2021

The water-stop curtain can effectively isolate or weaken the hydraulic connection between the inside and outside of the foundation pit, which has a significant impact on the safety of foundation pit excavation and the surrounding environment. In the event of the failure of the water-stop curtain, the measures of laying groundwater recharge wells outside the pit can be used to maintain the water level outside the pit and avoid excessive settlement of buildings outside the pit. Through the practice of a certain foundation pit in Shanghai, this paper proves the feasibility of groundwater recharge measures in dealing with the failure of the water-stop curtain and provides a reference for similar projects. Groundwater recharge measures have certain advantages over other treatment measures in terms of cost and construction period, and have good economic and social benefits.
Understanding and thinking of intelligent water conservancy in China under the background of informatization
Authors: Li Fuqiang , Li Xuan , Zhang Hengjia
Published: February 2021

In the new era of rapid development of information technology, intelligent water conservancy has become the inevitable trend of the development of water conservancy industry. This paper describes the development and status quo of smart water conservancy in China in recent years, analyzes and discusses the existing problems, and puts forward some suggestions for the corresponding problems, so as to provide a certain reference for the follow-up development of smart water conservancy in China.
Calculation and Analysis of Sluice Bottom Seepage with Two Methods
Authors: Jiang Linlin , Zhao Chuan , Zhang Jiongjiong
Published: February 2021

Based on Tianjin Xihe control sluice, this paper uses the improved resistance coefficient method and ABAQUS finite element software to calculate the seepage at the bottom of sluice. By comparing the calculation results, the advantages and disadvantages of two methods to calculate the seepage at the bottom of sluice are analyzed, which provides a new idea for the calculation of sluice bottom seepage.
Effect of Different Irrigation Patterns and Covering Methods on Soil Temperature of Onions Under Membrane Drip Irrigation
Authors: Deng Haoliang , Wang Peng , Zhang Yongling , Xiao Rang , Pan Xiaofan , Li Xuan , Wu Keqian , Chen Tao
Published: February 2021

In order to investigate the influence of the soil temperature of onions in the West Hebei Oasis, this paper tested the soil temperature of onions in the Oasis by using the early golden dragon onion as a test material and randomly grouped it into different irrigation modes and cover methods. There were five treatments in the experiment, and the soil temperature of onion was measured in each reproductive period, and the results showed that: The most significant changes in soil temperature were found in the 5 cm soil layer, where the soil temperature was more affected by external influences, and in the 10 and 20 cm soil layers, where the soil temperature was less affected by external influences. The difference in soil temperature was not significant between full irrigation and regulated deficit irrigation. The soil temperature in the black mulch layer was higher than that in the transparent mulch layer and fine sand mulch layer at the seedling and leaf development stages, while the soil temperature in the black mulch layer was higher than that in the transparent mulch layer and fine sand layer at the bulb expansion and maturity stages.The soil temperature of the onion can be best controlled by irrigation while covering the onion with black mulch throughout the growing season, which is of great significance for onion cultivation in the Hexi Irrigation Zone.
DEM analyses of cemented hydrate’s effect on the compression behavior of fine-grained sediments
Authors: Li Tao , Li Liqing
Published: February 2021

The participation of gas hydrate constitutionally affects the mechanical properties of gas hydrate-bearing sediments. The hydrates contribute to the mechanical properties of hydrate-bearing sediments by pore-filling, bearing and bonding effects. A discrete element model of hydrate-bearing silt was established randomly filled by the hydrate particles into silt-sized granular skeleton reservoir. The cluster & bonding hydrate is generated in the pores of the numerical silt reservoir to study hydrate’s mechanical effects. One-dimensional loading was applied to the numerical sample to investigate its volume change, bond degradation and stress transmission. The main conclusions are as follows. The structural yield stress corresponds with the abrupt bond breakage. Particles and contacts will be redistributed after the widespread bond breakage. The breakage of hydrate-hydrate bonded contacts is more quickly than that of silt-hydrate contacts ascribe to a crushing process of hydrate clusters (especially for SMH=45%).
Numerical Simulation Study on Cross Construction of Seawall Engineering and Bridge Foundation
Authors: An Xiaoyu , Wang Fei , Luo Yongjun , Zhang Yuting
Published: February 2021

In view of the overlapping project between the double track bridge of Ningbo-Taizhou-Wenzhou expressway and seawall, the large-scale three-dimensional finite element calculation is carried out by using the finite element software ABAQUS, the displacement limit of bridge pier top is studied, the internal force deformation of bridge pile foundation and its variation law in the process of seawall filling and later consolidation settlement are analyzed, and the influence of sea seawall filling on the stress and deformation of bridge pile foundation is studied. The calculation results show that: the main pier in the enclosure side of the two main piers in the design scheme is most affected by the construction of seawall. At the end of seawall construction, the longitudinal displacement along the bridge is 25.56cm, the transverse displacement is -10.68cm, and the settlement is 3.49cm. From the beginning of seawall construction to 15 years after the completion of seawall, the maximum longitudinal displacement along the bridge is -80.87cm, the maximum transverse displacement is -38.94cm, and the maximum settlement is 382.2cm, in which the settlement during the construction period is 346.0cm, accounting for 90.5%. The calculation results of design scheme show that the displacement of bridge pier top is too large, and the tensile stress of bridge pile is also large, therefore, it is necessary to optimize the design scheme to reduce the displacement of the bridge.
Effect of Different Irrigation Patterns and Covering Methods on Physiological characteristics of Onions Under Membrane Drip Irrigation
Authors: Deng Haoliang , Wang Peng , Xiao Rang , Zhang Yongling , Li Fuqiang , Wang Yucai , Wang Jiaqi , Bu Yifan
Published: February 2021

In order to investigate the influence of the physiological characteristics of onions in the Hexi Corridor, this paper tested the physiological characteristics of onions in the Oasis by using the early golden dragon onion as a test material and randomly grouped it into different irrigation modes and cover methods. There were five treatments in the experiment, and the physiological characteristics of onion was measured in each reproductive period, and the results showed that: The net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration all decreased with increasing amplitude of the transfer loss. Although the net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration of black mulch T1 were higher than those of transparent mulch T4, there was no significant difference between the two treatments, and the net photosynthetic rate, stomatal conductance, and intercellular CO2 concentration of T1 and T4 were significantly higher than those of sand mulch T5. The physiological characteristics of the onion can be best controlled by irrigation while covering the onion with black mulch throughout the growing season, which is of great significance for onion cultivation in the Hexi Corridor.
Research and application on numerical simulation of ship maneuvering motion under bank effect
Authors: Tang Meifang , Tong Sichen , Yang Yun
Published: February 2021

A ship maneuvering mathematical model was established considering the influence of river bank effect based on the depth integrated 2-D flow mathematical model. Tanking the section of the Suoluo beach reach of Lancang River in Yunnan Province as an example, the numerical simulation of ship maneuvering motion under bank effect was carried out. Results show that the typical ship can not ascend rapids when considering the bank effect, so it is necessary to implement channel regulation. The study reveals that the model can simulate the ship maneuvering motion and navigation status under bank effect, which can provide some useful references for the ship’s navigation and maneuvering in mountainous rivers.
Status and Evaluation of the Benefits of Developing Efficient Water-saving Irrigation Infrastructure in Gansu Province
Authors: Deng Haoliang , Pan Xiaofan , Zhang Hengjia , Xiao Rang , Zhang Yongling , Li Fuqiang , Wang Yucai , Chen Tao
Published: February 2021

Since the 20th century, national investment in agricultural irrigation has been increasing, indicating that the state is paying more and more attention to the “Three Rural Issues”. Along with the national emphasis on the "Three Rural Issues" and the background of increasing economic investment in agricultural irrigation, irrigation technology has been developing rapidly in Gansu Province, which is reflected in the year-on-year expansion of efficient water-saving irrigation area. The goal of water-efficient irrigation technology is to improve the water utilisation coefficient, thus optimising the planting structure of crops and increasing crop yields. Therefore, a variety of high-efficiency water-saving irrigation technologies such as pipe irrigation, sprinkler irrigation and micro-irrigation have been vigorously promoted and applied. The article analyses the current status and benefits of high-efficiency water-saving irrigation infrastructure in Gansu Province, and aims to provide data support and theoretical guidance for the development and improvement of high-efficiency water-saving irrigation in the province.
Analysis of application of cement paste grouting curtain in coastal environment
Authors: Peng Tao
Published: February 2021

Zhejiang Datang Wushashan power plant is composed of farmland and aquaculture ponds in the Xizhou seawall, which are backfilled with artificial riprap. In order to block the seepage path in the rock fill layer, the vertical curtain cement paste grouting anti-seepage reinforcement measures are adopted to block the connection between the underground water and the surrounding surface water in the plant area, so as to achieve the purpose of gas closure. This paper mainly analyzes and evaluates the technical indexes, such as grout diffusion range and impermeability, of the cement paste grouting curtain, via field tests and two dimensional numerical simulation based on the platform of PFC2D or Geostudio.
Study on Vegetation Water Requirements of Robinia pseudoacacia and its mixed plantation in Loess Gully Region
Authors: Fu Chong , Song Xiaoyu , Li Lanjun , Li Huaiyou
Published: February 2021

By calculating the vegetation water requirements(ETC
) of the typical plantations of Robinia pseudoacacia and Robinia pseudoacacia-Platycladus orientalis mixed plantation in the Loess Gully Region and analysing the coupling relationship between rainfall(P) and water requirements of each plantation, thereby scientifically guides local tree planting and afforestation, and better vegetation restoration.The Penman-Monteith formula is used to calculate the reference crop evapotranspiration in the study region, and then the double crop coefficient method is used to calculate the daily ETC
of Robinia pseudoacacia and its mixed plantation in different hydrological years. The result shows that from dry year to normal year, the ETC-RP-CO
is less than ETC-RP
by 48.8 mm and 52.2 mm respectively, and the growth season accounts for the largest proportion. The ETC-RP-PO
and ETC-RP
are not satisfied in most months of the growth season. Among them, the initial period and the development period of the growth season are the largest, with the largest water requirements deficits(D) reaching 58.65mm, 51.32mm (dry year) and 106.21mm, 93.18mm (normal years).The ETC
of two plantation increases from dry year to normal year.And the D also increases when vegetation water requirements satisfaction(S) increases, but the increase rate is expressed ETC
> S > D.
A Method of Wetland Planning and Design Scheme Decision Making
Authors: Xiangli HUO , Cong MA
Published: February 2021

In the bidding process of wetland planning and design scheme, in order to obtain the optimal solution through comprehensive trade-off from multiple bidding schemes, this paper proposes a comprehensive evaluation and decision-making method of wetland planning and design scheme based on the wetland planning and construction objectives and the commonly used evaluation index system of wetland planning and design scheme. The fuzzy correlation coefficient from the bidding scheme to the optimal and inferior wetland planning and design scheme is used to determine the relative advantage fuzzy correlation degree of each bidding scheme, and the priority degree of each bidding scheme is ranked according to the relative fuzzy correlation degree, so as to realize the evaluation and decision-making of wetland planning and design scheme. The application shows that the method can effectively solve the uncertainty problem in the comprehensive evaluation and decision-making process of wetland planning and design scheme, and has strong operability. It can provide a reference for similar problems in the process of engineering practice.
Effect of Different Irrigation Patterns and Covering Methods on Onion Water Consumption Characteristics
Authors: Deng Haoliang , Wang Peng , Zhang Hengjia , Xiao Rang , Zhang Yongling , Li Fuqiang , Wu Keqian , Liang Chao
Published: February 2021

In order to investigate the influence of the water consumption characteristics of onions in the Hexi Corridor, this paper tested the water consumption of onions in the Oasis by using the early golden dragon onion as a test material and randomly grouped it into different irrigation modes and cover methods. There were five treatments in the experiment, and the water consumption of onion was measured in each reproductive period, and the results showed that: (1) the soil water storage decreased with the increase of water loss, i.e. the soil water storage size was T1>T2>T3. The difference in soil water storage between black mulch and transparent mulch was smaller, but significantly larger than that of fine sand mulch. (2) The water consumption and water intensity of onion showed a decreasing trend with the increase of the adjustment loss, and the water consumption of fine sand cover > transparent mulch cover > black mulch cover. (2) The water consumption and water intensity of onions decreased with the increase of the regulation deficit, and the water consumption of fine sand mulch was more than that of transparent mulch and black mulch.
Numerical simulation of hydraulic characteristics of surface jet on horizontal base plate with shallow depth
Authors: Yan Zheng , Shuxiang Zhao , Hongchen Xu , Weiping Pan , Dong Zhang
Published: February 2021

The VOF (volume of fluid) method was applied to track free water surface, and the Realizable turbulent model was used to close the two-phase flow time-averaged equation to numerically simulate the hydraulic characteristics of surface jet on horizontal base plate with shallow depth. The result showed that a big vortex exists in the flow field, and the greater the inlet flow velocity, the longer the length of vortex. The distribution laws of horizontal velocity and longitudinal velocity of a cross section are different in the backflow region and open channel flow region. The gradient decaying of the maximum velocity on cross-section was mainly affected by the inlet velocity.
Establishment and application of oil spill model in inland waterway
Authors: Jiang Pinfeng , Tong Sichen , Wang Yiting
Published: February 2021

With the construction of reservoirs in China, inland waterway conditions have been greatly improved. The number of ships and tankers navigated in the inland waterways significantly increased which may lead to an increased risk of oil spill accidents. Oil pollution is one of the major threats to economy and ecosystem. To date research on oil spill is mainly focus on marine environment, however it is very limited on inland river. The purpose of this study is to combine our previous liner experimental study of characteristic of spread and transport of oil spill to develop a coupled two-dimensional oil spill model. An oil trajectory model has been conducted and applied for water surface spread simulation in the Luoqi reach of Yangtze River. The results can provide a reference for the prediction of spread and transport of oil spill in inland waterway.
Research and Application on Mathematical Model of Ship Manoeuvring Motion under Shallow water effect
Authors: Ran Tao , Tong Sichen , Yang Yun , Zhang Huan
Published: February 2021

When ships sail on the inland river in mountainous areas, the limited water depth can frequently lead to shallow water effect. To some extent, safety and maneuverability of shipping will be impacted. Consequently, it’s necessary to consider the shallow water effect when studying the ship ascending rapids in mountainous rivers. By considering the impact of shallow water effect, a three freedoms maneuvering mathematical model based on shallow water effect was established in this paper on the basis of two-dimensional water flow mathematical model. Application of the model was implemented on the regulation of the waterway in Suoluo rapids section of the Lancang River to obtain ship navigating parameters (helm angle, drift angle, heading angle, ship’s speed and speed against the water) for comparative analysis. Results show that the ship can reduce the impact of shallow water effect by adjusting the rudder angle and reducing the ship speed when navigating in shallow and narrow channel. The obtainment of the voyage line diagram by the simulation of ship’s maneuverability test validates that the ship can ascending rapids through self-propulsion after the river regulation.
The study of hydraulic characteristics of pneumatic lifting pump with air startup and shutdown
Authors: Zuo Juanli , Wu Shuang , Huang Ze , Wei Bingqian , Zhang Ning
Published: February 2021

Pneumatic lifting pump, as one of the ideal new methods for mining and upgrading, has obvious advantages such as simple structure, safety and reliability. The research of it has important scientific value and engineering significance. Based on Fluent simulation software, using Euler model and SST k-ω turbulence model, with the help of UDF self-programming, the influence of variable air volumes-linear opening, linearly closing on the hydraulic characteristics of the air-water lifting pump is discussed. The results are shown as follows. 1) In the slow linear opening mode of the gas flow, the liquid lifting flow increases, the change trend of it is slower than that of fast linear closing mode. 2) In the slow linear closing mode of the gas flow, the liquid lifting flow reduces, the change trend of it is slower than that of fast linear closing mode. These research results will lay the theoretical foundation for the application of pneumatic lifting technology in river dredging, sewage treatment, oil extraction and other fields.
Research on the quality risk assessment model for water conservancy projects based on the semi-supervised classification of text
Authors: Zou Zhenyu , Feng Jingchun , Wei He , Li Sheng , Zhang Ke
Published: February 2021

This paper systematically analyzes the quality supervision data system of water conservancy projects. Then, according to the characteristics of water conservancy project quality supervision text, the Word2vec algorithm and TFIDF algorithm are combined to construct a feature extraction system of water conservancy project quality supervision text suitable for short length and few samples. Finally, a semi-supervisory model system consisting of logical regression, simple Bayes, and SVM is introduced to solve the problem of incomplete quality supervision risk data for water conservancy projects. To sum up, on the basis of the three parts, i.e. data system, feature extraction, and semi-supervisory text classification, we build a water conservancy project quality risk assessment framework and provide a data processing tool for machine learning of hydraulic engineering quality risks.
Flood control impact assessment of Tai’an Viaduct (across Panwen River) on Qingdao Lanzhou Expressway
Authors: Wei Zhaozhen , Wang Guanghui , Liu Lili
Published: February 2021

This paper introduces the bridge design and the basic situation of the river channel. Through the calculation of the design flood, backwater, scouring and silting at the bridge site, the paper analyzes and demonstrates the rationality of the construction project from the aspects of the relationship and influence with the relevant planning, the adaptability with the existing flood control standards and management requirements, the impact on the flood safety and appropriate stability, the impact on the existing flood control projects and the flood control and emergency rescue.
Bibliometric Analysis of Water Conservancy Talent Development Research in China
Authors: Ge Qiuli , Zhang Long
Published: February 2021

In order to study the overall status of the research on water conservancy talent development in China, 6135 articles on the water conservancy talent development published in the past 30 years were downloaded from CNKI. Taking these articles as the sample, the time distribution, hot topic, topic cluster and research frontier of the water conservancy talent development research were quantitatively analysed with CiteSpace software. The results indicate that the scale of water conservancy talent development research has increased significantly in the past 30 years, but it has not become a popular school in the field of water conservancy research. Moreover, the research on the development of water conservancy talent involves a wide range of topics, including water conservancy reform, talent management in enterprises, talent education, rural water conservancy talent development, but the research appears extensive on the whole, so the future research can develop in a more refined way.
The Hydrodynamic Division of Lingdingyang Estuary and its Application in the Impact Analysis of Large Water-Related Projects
Authors: Yang Liling , Yang Fang , Yu Shunchao , He Yong , Li Yue
Published: February 2021

The dynamic environment of lingdingyang estuary is very complex due to the confluence of runoff and tide as well as the different characteristics of each entrance. Meanwhile, human activities are intensive. Taking the large bridge project of the Pearl River Estuary--Shenzhen-Zhongshan Bridge Project as an example, this paper divides the waters of Lingdingyang estuary where the project is located into tidal channel area, shoal area and two west flood discharge areas based on the differences of hydrodynamic and environmental characteristics. Combined with the one and two-dimensional tidal current model of estuary and delta, the paper discusses the dynamic response of different dynamic characteristic areas to the engineering construction, and carries out the construction scheme optimization and hydrodynamic influence demonstration. The project impact analysis based on dynamic zoning proposed in this paper not only rationally evaluates the hydrodynamic environmental impact of large water-related projects of Lingdingyang, but also is of great significance to the balance of protection and development of Lingdingyang Estuary.
Rainfall-induced landslide displacement prediction model based on attention mechanism neural network
Authors: Tang Tianjun , Tang Feifei , Wang Xifei
Published: February 2021

Being influenced by fluctuating precipitation, long-term rainfall-induced landslide displacement prediction could be unstable. To solve this problem, a rainfall-induced landslide displacement prediction model based on Attention Mechanism Neural Network(AMNN) is proposed in this paper. Firstly, accumulative landslide displacement is decomposed into the trend term and the periodic term. Secondly, multivariate linear regression is adopted to fit the trend term and AMNN is used to predict the periodic term. Finally, the accumulative predicted displacement is given by summing the trend and the periodic displacement components. In this paper, one rainfall-induced landslide in Chongqing province, China was taken as an example to evaluate the designed model. Compared with some existing methods, the model proposed in this paper can captured the correlation between each feature sequence and the predicted term with higher prediction accuracy of 0.97 Goodness of Fit. The results of this paper are believed to be contributive to further rainfall-induced landslide forecast and early warning research.
Comprehensive application mode of flood and waterlogging control as well as water resources regulation in coal mining subsidence area of Nansihu basin, China
Authors: Zhao Weidong , Wang Weiping , Qu Shisong , Meng Yujie
Published: February 2021

The basin of Nansihu lake is dominated by alluvial plain landform in Shandong Province, China. The region is rich in coal resources and coal mining has formed a large number of subsidence areas. In view of the difficulty of surface water regulation and storage in plain area and the fact that coal mining subsidence area can provide effective storage capacity. The mode of combination of flood, waterlogging control and water resources regulation by using coal mining subsidence area in the basin is put forward. The advantages and disadvantages compared constructing plain reservoirs with using coal mining subsidence area as reservoirs is recognized. The effects of flood control and waterlogging control in coal mining subsidence areas from the scale of watershed and specific cases are analysed. From the perspective of flood and waterlogging control effect, in 2025 and 2035, coal mining subsidence area can reduce the flood of 5% frequency by 12.43% and 34.22% respectively. By 2025, urban waterlogging at 20% frequency will be reduced by 56.19%. In 2035, the ability of coal mining subsidence area to resist urban waterlogging at the same frequency can reach 100%. The coal subsidence area in Longguhu can reduce the flooding at 10%, 5% and 2% frequencies by 15.8%, 12.1% and 9.2%, respectively. It can completely resist the one-day waterlogging in the city at 20% frequency and reduce the waterlogging in the city for three-days by 70.8%. The reconstruction of plain reservoir using the coal mining subsidence area is feasible in technology and engineering construction. But it is still faced with the problem to be solved of the guarantee rate of water supply, water quality etc…