Abstract:The safety and sustainable operation of the reservoir is of great significance to the economic benefits of the surrounding areas.The study employs piezometric tests and finite element analysis methods to evaluate the seepage stability of the dam foundation and dam slopes,respectively.The results show that a total of 81 sections were inspected in the piezometric tests,with the highest permeability rate found in the horizontal toe plate hole J-2,section 2 of the bedrock,which was 2.91 Lu,meeting the anti-seepage standard of 3 Lu.The AutoBank finite element simulation software was used to calculate the dam slope stability under five possible conditions,and the safety factors under each condition met the regulatory requirements.It is concluded that under the action of seepage,the dam foundation and slopes are basically stable,and there is no risk of reservoir leakage.

Abstract:To ensure the structural safety of the lining during the repair of the channel in the Middle Route of the South-to-North Water Diversion Project,this study develops a refined three-dimensional(3D)numerical model based on the concrete damaged plasticity(CDP)theory,leveraging a dry-land repair scheme with an expandable cofferdam.The model is used to investigate the stress,displacement response,and damage evolution of the channel slope lining slab under various load distribution ratios between the track system and the waterstop structure.The results indicate that:During the cofferdam lowering stage,the lining slab remains within the elastic range,and the structure is safe.After dewatering the cofferdam's interior,the stress in the lining slab increases significantly,with the upper surface primarily subjected to compressive stress and the lower surface to tensile stress.When the load distribution ratio between the track system and the waterstop structure is 5:5,the stress distribution in the lining slab is uniform,the total displacement is minimized,and no compressive or tensile damage occurs,indicating that the structure is in an optimal elastic working state.The findings of this research can provide a theoretical basis for the optimal design of the expandable cofferdam and for ensuring construction safety.

Abstract:The facade stone protection of the Muchang Ship Lock Project on the North Canal was constructed using the dry-hang method.However,the conventional installation process suffered from issues such as relatively low construction efficiency and significant schedule risks.Through technical diagnosis,the alignment calibration between the grooves and the hangers was identified as the key bottleneck restricting construction efficiency.To address this problem,two core technical improvement measures were proposed:(1)replacing the sling material with a soft steel wire rope(6×7-FC1770ZS)of 8 mm diameter to resolve the difficulty of sling removal after installation;and(2)optimizing the measurement reference by shifting the measuring points from the front face of the dressed stone to the back face without decorative patterns,thereby improving measurement accuracy.Engineering application results demonstrate that after optimization,the installation time per single block of dressed stone was reduced from 36 minutes to 14 minutes,a reduction of 61.1%,and the daily installation volume increased from 17 blocks to 41 blocks,meeting the milestone schedule requirements.The research findings can serve as a reference for the installation of dressed stones in similar ship lock and water conservancy projects.

Abstract:Taking the downstream diversion scheme of Raoyang River as an example,based on the calibration of one-dimensional MIKE11 model and the verification of two-dimensional MIKE21FM model,the influence of different diversion channel widths(50 m,100 m,200 m)on the flood level and diversion efficiency of the river channel is analyzed.The results show that the width of the diversion channel is positively correlated with the decrease in water level,but the increase slows down with the increase of width;The 200 m wide diversion channel reduces the water level by 1.05 m for floods that occur with a return period of less than 5 years,and significantly increases the proportion of diversion flow.The research can provide a reference for the design of flood diversion projects in northern plain rivers.

Abstract:At present,the world is undergoing profound changes unseen in a century,and as the"14th Five-Year Plan"comes to an end and the"15th Five-Year Plan"begins,the final stage of the post-resettlement support policy for reservoir migrants is approaching.During this period,the economic development of reservoir areas and resettlement areas and the implementation of the policy have encountered many difficulties and obstacles,with numerous uncertainties that affect the sustained effectiveness of the post-resettlement support policy.This article mainly introduces the basic situation of the post-resettlement support policy for large and medium-sized reservoir migrants in Zhongning County,Ningxia,summarizes the main experiences and practices in implementing the policy,analyzes and summarizes the problems and shortcomings,and explores new concepts,implements new methods,and provides new ideas in terms of ideology,system,management,and innovation.It aims to provide practical references and innovative ideas for the implementation of policies in migrant areas and promote the high-quality economic development of migrant areas.

Abstract:The engineering procurement construction(EPC)joint venture model has become the mainstream construction mode for large and medium-sized water conservancy projects in China.However,existing research still has gaps in refinement of safety management responsibilities and rights in joint ventures and design-construction safety synergy.Under the EPC joint venture model,safety management faces five typical problems:diluted safety responsibility,absence of source prevention and control,fragmentation of management and control systems,insufficient emergency support,and weak subcontracting control.Taking the Jiyun River Estuary Pumping Station Project in Tianjin as a case study for empirical research,this paper proposes a comprehensive safety management system addressing these issues,encompassing responsibility consolidation,deep integration of design and construction,rigid assessment mechanisms,unified emergency management,and full-chain subcontractor control.The project achieved zero safety incidents throughout the entire construction process involving deep foundation pits and electromechanical equipment installation,with a 100%closed-loop rectification rate for potential hazards and a 100%compliance rate for major risk engineering controls.The project was also selected as a pilot project for the"Six Mechanisms"of safety risk control in Tianjin.The research findings can provide replicable practical references for refined safety management in similar water conservancy EPC joint venture projects.

Abstract:To advance renewable energy development tailored to local conditions,explore a new mode combining photovoltaic development and hydraulic engineering construction,effectively promote the development and consumption of new energy,and serve the implementation of the dual carbon strategy;Using current policies and regulations as a foundation,this paper took the South-to-North Water Diversion Middle Route Project as an example and proposed a method for photovoltaic construction using various water resources of the long-distance water transmission line in the Hebei section,such as the outer slope of the main canal,the drainage channel,the muck disposal sites,the inverted siphon,and the gate chamber roofs;and assessed the feasibility of establishing a"photovoltaic corridor for ecologically-optimized water diversion"along this route.The construction of photovoltaic corridors can make full use of existing water project resources,adapt renewble energy development to local contexts,and set a replicabe paradigm for green transition of major infrastructure,which proves highly scalability.

Abstract:Taking the Hebei Fengning Pumped Storage Power Station as an example,this paper discussed the applicability and implementation path of the phased acceptance mode for soil and water conservation in pumped storage power station projects with long construction periods and batch commissioning.Aiming at the contradiction between the"three simultaneous"requirements in the Law of the People's Republic of China on Soil and Water Conservation and the batch commissioning of pumped storage power stations,as well as the inapplicability of phased acceptance in the Acceptance Specification for Soil and Water Conservation Engineering of Hydropower Project,this paper employed a combination of case analysis and policy review,focusing on the connection between actual project progress and the"three simultaneous"system for soil and water conservation.The results indicate that through reasonable division of phased acceptance scope and refinement of six-indicator calculation,the phased acceptance mode can effectively coordinate the temporal contradiction between project phased commissioning and soil and water conservation acceptance,achieving a benign control mechanism of"construction,restoration,and acceptance simultaneously".The phased acceptance of the Hebei Fengning Pumped Storage Power Station provides referable management ideas for soil and water conservation acceptance of similar projects,and simultaneously provides practical basis for promoting the improvement of relevant codes in terms of phased acceptance scope,standards,and procedures.

Abstract:To evaluate the impact of impervious walls on the seepage characteristics of a small(Type 2)reservoir dam,this paper employs numerical simulation based on Autobank software to compare and analyze the seepage characteristics and downstream slope stability of the dam body under two conditions:with and without an impervious core wall.Five typical operating conditions are selected for the study,and key parameters such as the exit point slope,horizontal segment slope,exit point elevation,seepage flow rate,and slope safety factor are quantitatively calculated.The research results show that after the installation of the impervious wall,the exit point slope,horizontal segment slope,exit point elevation,and seepage flow rate of the dam body are significantly reduced,and the dam slope safety factor is improved.The impervious core wall ensures the seepage stability of the dam body and plays an important role in the safe operation of the dam.

Abstract:The Zhanghe River,an important river in the Zhangwei South Canal system of the Haihe River Basin,originates from the Shanxi Plateau and flows through Shanxi,Henan,and Hebei provinces,converging with the Wei River at Xuwancang to form the Wei Canal.This article takes the mainstream of the Zhanghe River as the research object,reviews the previous management of the mainstream of the Zhanghe River,and conducts a retrospective evaluation of the river flow,ecological water discharge satisfaction,water environment quality,terrestrial ecological environment,and aquatic ecological environment of the mainstream of the Zhanghe River.The results show that due to the interception and storage of Yuecheng Reservoir,the mainstream of Zhanghe River often experiences flow interruption,the ecological water discharge of the river is not satisfactory,the aquatic organisms are scarce,and coupled with illegal sand mining in history,the ecological environment of the river is poor.Based on the main ecological and environmental issues existing in the mainstream of the Zhanghe River,suggestions for subsequent protection and management have been put forward.

Abstract:With rapid urban development and the combined effects of various factors,urban river flood control faces new challenges.To further explore the flood control situation and countermeasures for small and medium-sized urban rivers,the current status of flood control work for Xituchenggou in the North Canal system of the Haihe River Basin was systematically reviewed.Addressing its characteristics of being an artificial channel,small flood discharge capacity,and weak links in the flood control system,corresponding countermeasures were proposed.These include restoring river functions,improving the comprehensive quality of management personnel,perfecting supporting equipment and facilities alongside intelligent management systems,implementing pre-discharge flood measures,and carrying out post-rain decontamination to maintain appropriate water levels.These measures aim to balance flood control safety with the water ecological landscape and meet the needs of the capital's water culture construction.The proposed countermeasures provide references for future flood control work in small and medium-sized urban rivers.

Abstract:Water resource regulation is an important measure to ensure the ecological flow of rivers.Based on the implementation of the Dawenhe River water resource regulation in recent years,the imcompletion of the rigid constraint index system for water resources,the difficulty of controlling key water intake points,the low frequency of flow monitoring during warning periods,the insufficient backup ecological water sources for emergency regulation,and the large conflict between ecological and agricultural water use have been summarized.Suggestions such as to strictly manage the allocation of river water volume,improve the informatization level of water resource regulation,increase monitoring frequency during warning periods,reasonably allocate emergency regulation ecological water sources,and adjust the ecological flow guarantee goals of the Daicun Dam Hydrological Station have been put forward.These suggestions can provide reference for water resource regulation and management in other river basins.

Abstract:Liaoning Province has formulated and issued local standards for water use quotas,and has achieved great results in water saving work.However,the method for formulating industrial water quotas is still relatively simple.On the basis of analyzing the current situation of water quotas in Liaoning Province,this paper collected and organized local standards for industrial water quotas in 31 provinces(autonomous regions,municipalities directly under the central government),and established a database of industrial water quota standards;Preliminary calculations were conducted on reasonable data within the sample using the reference revision method,bubble sorting method,and secondary average method.Comprehensive analysis was conducted according to the Analytic Hierarchy Process and expert opinions.The industrial water quotas based on the characteristics of Liaoning Province's industrial water usage level and other factors were formulated.

Abstract:The Longhekou Water Diversion Project pipeline adopts a pipe jacking scheme plan to cross the national highway,and the overlying strata are gravel layers with high groundwater levels.Currently,there are few cases of pipe jacking implementation in such environments,making the project implementation difficult.The engineering design adopts various solutions such as the transformation of the pipe jacking machine cutterhead,the improvement of the grouting system,the pre-reinforcement of the jacking stratum,and the monitoring technology of road surface settlement.The design scheme has been verified to be reasonable and effective through construction,and can provide reference for future pipe jacking design and construction under similar conditions.

Abstract:In hydraulic engineering construction,pipe jacking is an important method for crossing underground tunnels.The MJS technology can reinforce the soil during the jacking process,increase its bearing capacity,and reduce the impact of construction-induced foundation settlement on surface structures.This paper focuses on the application of pipe jacking technology in special operation scenarios under railway mainlines,aiming to explore the impact of MJS pipe jacking technology on railway foundation settlement and deformation under different working conditions,providing a reference for similar projects.The underpass construction of the Li Xi Canal and the Baiyun Airport Second Expressway North Drainage Canal beneath the New Bai Guang Intercity Railway is analyzed using the finite element method to study the impact of foundation pit and pipe jacking construction on railway foundation settlement and deformation under various working conditions.The calculation results show that the maximum horizontal displacement and vertical settlement of the intercity railway box culvert and track structure are minimal,with the maximum settlement difference in the deformation joint tunnel being 0.287 mm.The displacement and settlement values meet the engineering expectations.Therefore,the MJS method can effectively control the settlement of railway foundations under various working conditions.

Abstract:Concrete honeycombing and pitting,as typical construction defects in hydraulic engineering,directly affect the structural durability and safety.Taking the repair project of the gate pier in Fushui Reservoir as an example,this study systematically investigates the causes of honeycombing and pitting,the repair process,and the collaborative application of array ultrasonic detection technology.Cause analysis reveals that insufficient vibration,concrete segregation,and formwork leakage are primary contributors.A layered repair process of"chiseling-cleaning-patching-curing"combined with high-grade mortar achieves precise repair.Innovatively,array ultrasonic shear wave reflection imaging technology is introduced for three-dimensional non-destructive defect detection and quantitative evaluation.Detection results indicate good compactness of the repaired concrete with no honeycombs or voids.The study proposes a"precision repair-quantitative evaluation"technical system,providing new insights for quality control of hydraulic concrete.It also recommends multi-method verification for critical projects to enhance defect treatment efficiency and reliability.

Abstract:The use of remote sensing technology to invert soil moisture data plays an important role in regional drought monitoring.This study utilized Landsat 8 remote sensing image data to construct the feature space of surface temperature(TS)and normalized difference vegetation index(INDV)in Liaocheng,and validated the inversion model using field measured soil moisture data.Research has found that the ITVD obtained from remote sensing image inversion is significantly correlated with the measured soil moisture content in the field(α=0.05).The highest correlation was found between ITVD and soil moisture from 10 to 20 cm(R2=0.576).From October 2020 to April 2021,Liaocheng experienced varying degrees of drought,with a drought area of 64.34%in April 2021.The monitoring results are highly consistent with the actual drought situation in Liaocheng.In summary,ITVD can be used for drought monitoring in Liaocheng.

Abstract:To study the leakage and failure mechanism of the core dam of Shangdian Reservoir,the Johansen mathematical thermal conductivity model was introduced,and the influence of the geometric and physical characteristics of the core wall on the flow heat transfer of the core dam was studied based on the COMSOL numerical calculation platform.Research has shown that the permeability coefficient of the core wall will change the head value and infiltration line of the core wall dam,especially the stable period of the infiltration line will be affected.In contrast,the permeability coefficient of the core wall has a higher impact on the single width seepage volume of the dangerous area than the total single width seepage volume of the core wall.As the permeability coefficient of the core wall increases,the temporal changes in the temperature field of the core wall dam will not be affected,but will only alter the temperature distribution level of the core wall dam.The inclination of the core wall has a relatively small impact on the water head value of the core wall dam,but it will change the balance of the seepage line of the dam body.At the same time,the inclination of the core wall has less effect on the single width seepage flow of the dangerous area than the total single width seepage flow of the core wall.The inclination of the core wall will change the temporal trend of the temperature field of the core wall dam and shorten the stable period of the temperature field of the core wall dam.The research conclusion has certain reference significance for the coupling study of seepage field and temperature field of reservoir core wall dam,as well as the exploration of leakage failure mechanism.

Abstract:In cold rural areas,affected by factors such as cold climates,substantial thickness of frozen soil layers,and large fluctuations in sewage volume,sewage pipelines are prone to freezing and clogging.This phenomenon severely restricts the normal operation of sewage discharge systems and affects the quality of the rural living environment.Taking the rural areas in the cold region of Miyun District,Beijing as a typical representative,based on a systematic analysis of the causes of pipeline freezing and clogging,corresponding improvement countermeasures were proposed to address issues such as insufficient consideration of local frozen soil thickness during the design phase,poor venting at discharge nodes leading to freezing,inadequate insulation measures,and insufficient construction quality control.These include rationally determining pipe burial depth,selecting appropriate pipe materials and structures,configuring efficient and reliable insulation layers,improving auxiliary anti-freezing facilities,and strengthening winter inspection,dredging maintenance,and emergency response.The results provide a reference for the planning,design,operation and maintenance of sewage projects in cold rural areas.

Abstract:In order to continuously improve Beijing's flood control system,it is necessary to conduct an in-depth analysis of the rainfall and water conditions in the city's small-and medium-sized rivers.Taking Xitucheng Ditch in the north canal river system as an example,precipitation data for the region in 2024 were collected and compiled.Focusing on elements such as rainfall,river water conditions,and diverted water supply,and combined with historical data for comparative analysis,it was concluded that during the 2024 flood season,small-and medium-sized rivers in Beijing were characterized by abundant precipitation and ample diverted water supply,with rainfall unevenly distributed throughout the year.The results of this study provide strong data support for flood control decision-making in small-and medium-sized rivers.