scholarly journals Repairing earth dam drainage systems

Vestnik MGSU ◽  
2019 ◽  
pp. 901-911
Author(s):  
Denis A. Krutov
Keyword(s):  
Reinforced Concrete ◽  
Drainage System ◽  
Hydroelectric Power Plant ◽  
Earth Dam ◽  
Design Solution ◽  
Filtration Flow ◽  
Hydroelectric Power ◽  
Drainage Channel ◽  
Open Drainage ◽  
Drainage Systems

Introduction: when reconstructing or overhauling dams, great attention should be paid to drainage systems as the most critical components of the installations. The article describes the typical malfunctions of earth dam pipe drainages. The research considers geological and hydrogeological features that were not taken into account when developing projects. Materials and methods: control and measuring instrumentation (piezometer network), full-scale experiments on disabling pipe drainage and mathematical modelling were used as the filtration regime research methods. Results: analysis of the hydrogeological features of the base of the right-bank floodplain dam of the Nizhegorodskaya hydroelectric power plant and field filtration observations revealed a strong drainage effect of the base on the filtration flow at several areas of the dam body. At the other areas, a high groundwater level position at the dam downstream and its outlet into the pipe drainage at the downstream were recorded. Substantiated by filtration calculations, the proposed repair of the drainage system consisted in designing open drainage along the dam axis and backfilling the territory at the downstream by 2.0 m that excludes impoundment of the territory without the pipe drainage. Conclusions: the following engineering solutions can be recommended for repairing earth dam drainage systems: construction of backfill drainage trenches in the dam downstream, new pipe drainage at higher elevations or an open drainage channel in solid reinforced concrete arranged along the axis of the dam. The proposed version of the pipe drainage repair provides for constructing an open drainage channel in solid reinforced concrete on a reverse filter with an arrangement of gravel-filled asbestos-cement pipes in the dam slopes and bottom. Such a design solution allows repairing the drainage system without dewatering and, if necessary, completely refusing the existing pipe drainage.

scholarly journals Specific aspects of the retrofitting design and seismic assessment of a heritage pedestrian bridge

2020 ◽  
Vol 63 (4) ◽  
pp. 65-77
Author(s):  
Emil Yanev
Keyword(s):  
Optimal Solution ◽  
Investment Project ◽  
Hydroelectric Power Plant ◽  
Normal Operation ◽  
Design Solution ◽  
Original Structure ◽  
Hydroelectric Power ◽  
Pedestrian Bridge ◽  
The Subject ◽  
Selection Of

The purpose of this study is to establish a suitable structural system for the restoration of the destroyed part of the pedestrian bridge, which is a part of a hydrocomplex built along the Arda River (Bulgaria), and to improve the vulnerable details in the original structure, taking into account the seismic hazard on the site. The decision is also dictated by the choice of a construction method that does not interfere the Hydroelectric Power Plant (HPP) that is built along the river with the normal operation of which the subject is connected. The appropriate selection of materials and modelling of the overall behaviour of the old and new parts of the bridge are the basis of the optimal solution for interference with the structure and the possibility of extending its service life. It is also important to preserve the visual unity of the whole structural complex, thus preserving the original appearance and good construction practice from the time they have been built during the middle of the 20th century This design solution is part of an investment project of "Risk Engineering" Ltd.

Seepage through Earth Dams with Chimney Drain on Pervious Foundation

2012 ◽  
Vol 452-453 ◽  
pp. 538-542 ◽  
Author(s):  
Abdelkader Djehiche ◽  
Rekia Amieur ◽  
Mustafa Gafsi
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Drainage System ◽  
Earth Dam ◽  
Earth Dams ◽  
Drainage Systems ◽  
The Earth ◽  
Excess Water ◽  
Effective Drainage

This paper presents an experimental study of a homogenous earth dam. The work is focused to the search of solutions of problems encountered in the earth dams after their construction. One of the major problems is the choice and design of systems of drainage. The effective drainage system to prevent harmful accumulations of excess water is one of the most important roles of dams. Efficient drainage systems can improve the safety of earth dams. The paper presented herein reports the results obtained from the experimental study. Empiric relations have been obtained which can be help in the control of the flow rate in the chimney drain of the earth dams on pervious foundation, which can increase safety earth dams

Modelling and Simulation of Open Drainage Systems

2013 ◽  
Vol 373-375 ◽  
pp. 427-430
Author(s):  
Li Hui Cen ◽  
Hong Lin Zhu
Keyword(s):  
Parameter Identification ◽  
Drainage System ◽  
Modelling And Simulation ◽  
Rainfall Data ◽  
Open Drainage ◽  
Simplified Models ◽  
Drainage Systems ◽  
Identification Method ◽  
Duke University

This paper proposed a parameter identification method for simplified models of open drainage systems. SWMM is used to identify these parameters by taking the rainfall data as the input. Simulations show that the results of the proposed method have high accordance with those of SWMM. The drainage system of Duke University is taken as an example to demonstrate our approach.

scholarly journals Environmental Regimes of Drained Soils of the Novgorod Region

2020 ◽  
Author(s):  
Olga Balun ◽  
Lyudmila Tiranova
Keyword(s):  
Subsurface Layer ◽  
Drainage System ◽  
Drainage Network ◽  
Open Drainage ◽  
Mineral Salts ◽  
Drainage Systems ◽  
Closed Drainage ◽  
Significant Difference ◽  
Subsurface Layers ◽  
Reclamation System

Under the influence of drainage, new ecological regimes of groundwater and soil moisture are formed, which in turn form new nutrient regimes. The objects of this study are the ecological regimes of lands reclaimed in different ways: by an open drainage network (with the use of runoff hollows) and a closed drainage network. Experimental plots are located in the Novgorod region on sod-podzolic soil. The efficiency of the reclamation system is determined by the groundwater regime. The results of the research prove that the regime of groundwater in closed drainage systems is more favorable compared to the open drainage system. The analysis of the nutrient regime of drained soils showed a decrease in agrochemical indicators due to the removal of minerals by runoff. More mineral salts are washed away in closed drainage (up to 711 kg/ha). Considering the agrochemical composition of the soil, calcium ions are removed most intensively from sod-podzolic soils. The water-physical properties of the drained lands, such as density, porosity and moisture content, have also changed. The study of water-air regimes of reclaimed soils revealed a significant difference in the degree of moisture of the plow and subsurface layers when implementing either one or different methods of drainage. A more favorable water-air regime is created by closed drainage systems in the subsurface layer, and by open drainage systems – in the plow layer.

scholarly journals Hydraulic calculation of horizontal open drainages

2019 ◽  
Vol 97 ◽  
pp. 05039 ◽  
Author(s):  
Aybek Arifjanov ◽  
Maqsud Otaxonov ◽  
Luqmon Samiev ◽  
Shamshodbek Akmalov
Keyword(s):  
Flow Velocity ◽  
Drainage System ◽  
Soil Condition ◽  
Drainage Water ◽  
Hydraulic Calculation ◽  
Good Effect ◽  
Deep Drainage ◽  
Open Drainage ◽  
Drainage Systems ◽  
Motion Mode

In article analysed the factors influencing the hydraulic processes which arise in the open horizontal drainage systems. Open drainages plays important role in order to improve the ameliorative condition of the agricultural area, salt washing on the soil. It is emphasized that the deep drainage in our region has a good effect on the soil condition and salt removing. At present, efforts are being made to improve the productivity of the collectors to clean and built. As example the collector drainage systems in Syrdarya region are listed. It is observed that the motion mode of open drainage flows is physically identical. Due to the complexity of equations in the unstable motion mode, the drainage water flow scheme in the collectors reflects the hydraulic calculation of the movement. Researches were provided in open agricultural drainage system of Syrdarya region and analysis have been done in natural field conditions. It has been noted when slope of the drainage bed is equal to i<0,0005 intensity of deformation were very high, when slope was between 0,0005<i<0,0011 intensity of deformation of collector bed was equal to the minimum level. In this article provided hydraulic calculation for Syrdarya region drainage system for choosing dynamical stable shape of bed. Those hydraulic calculations and projections ensure collectors with long time period of exploitation condition. Calculation and analyses were done with taking account trapezoidal capacity of the stream in drainage system, and the results of studies on increasing the flow efficiency are reflected. Analysed that when slope will increase until 20% discharge capacity will increase because of high average flow velocity increased by 7-8 times and discussed difference of them. As a result of the hydraulic calculation, the slope of the drainage increased from i-0,00048 to i-0,0006, the fact that the flow capacity increased by 25% due to the increase because of flow velocity.

scholarly journals Prioritization of hydroelectric power plant earth dam safety procedures: a multi-criteria approach

2021 ◽  
Vol 80 (24) ◽  
Author(s):  
José Roberto Ribas ◽  
Juliana C. R. Severo ◽  
Letícia C. G. Felix ◽  
Kim P. C. Perpetuo
Keyword(s):  
Power Plant ◽  
Hydroelectric Power Plant ◽  
Earth Dam ◽  
Dam Safety ◽  
Hydroelectric Power ◽  
Safety Procedures

scholarly journals Prioritization of hydroelectric power plant earth dam safety procedures: a multicriteria approach

2021 ◽  
Author(s):  
Jose Roberto Ribas ◽  
Juliana Crenitte Ribas Severo ◽  
Leticia Gonçalves Felix ◽  
Kim Parente Currlin Perpetuo
Keyword(s):  
Hydroelectric Plant ◽  
Fuzzy Ahp ◽  
Hydroelectric Power Plant ◽  
Earth Dam ◽  
Plant Management ◽  
Dam Safety ◽  
Hydroelectric Power ◽  
Central Brazil ◽  
Dam Operation ◽  
Safety Procedures

Abstract The number of procedures focused on dam safety is very large, mainly due to the rules established by different regulatory bodies, the guidelines that are part of the recommended best practices for engineering works, and the common sense and conservatism present in dam operation and maintenance because of the large socioeconomic and environmental impacts that any incident with a dam can cause. In practice, the vulnerability of a dam is inversely proportional to the improvement of safety procedures, such as monitoring and sensing, and the staff's capacity to interpret the information in timely fashion. Therefore, establishing priorities for these procedures is essential for the plant management to define the scheduling and detailing of inspections and monitoring, as well as training needs. The MCDA model described here was specified based on regulations and practical public domain guidelines. The subjective estimation of preferences was done by the staff of a hydroelectric plant located in central Brazil. It employed the Simos method combined with a procedure adopted to convert the scores to the format of paired comparisons. The weights for dam safety procedures were obtained using the fuzzy AHP method. The method allowed obtaining the classification of safety procedures according to their priorities, and thus provided the plant management with elements to better schedule monitoring and staff training.

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