scholarly journals Crack Treatment of Sprayed Concrete Layer in Tail Water Surge Chamber of Guandi Hydropower Station During Operation

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Yun Zhang
Keyword(s):  
Surface Relaxation ◽  
Hydropower Station ◽  
Power Station ◽  
Concrete Cracking ◽  
Sprayed Concrete ◽  
Field Surveys ◽  
Concrete Layer ◽  
Geological Conditions ◽  
Length Width ◽  
Tail Water

The dimensions of the tail water surge chamber of Guandi Hydropower Station are 205m × 21.5m × 57 (length × width × height), and the top 21.5m area is permanently lined with net-jet concrete. Sprayed concrete cracking occurred during the excavation construction process, and cracking, peeling, and block dropping occurred again after the power station was in operation. According to geological conditions, field surveys, and monitoring instrument data analysis, it is believed that the surrounding rock is stable overall, and the cracks are mainly manifested by shallow surface relaxation caused by stress release in the shallow surface rock mass of the tailing chamber and cracking failure of the concrete spray layer. The cracked and damaged sprayed concrete cracking was treated while the power station remained in operation. Processing was completed in November 2015 and the power station is currently running well.

Monitoring Analysis of the Underground Cavities in Guandi Hydropower Station during the Construction Period

2011 ◽  
Vol 368-373 ◽  
pp. 2925-2931
Author(s):  
Chun Yu Gao ◽  
Jian Hui Deng ◽  
Fan Li Meng
Keyword(s):  
Surrounding Rock ◽  
Hydropower Station ◽  
Water Control ◽  
Maximum Deformation ◽  
Monitoring Design ◽  
Geological Conditions ◽  
Underground Cavities ◽  
The Stability ◽  
Tail Water ◽  
The Right

The underground cavities of the Guandi Hydropower Station comprise four pressure division tunnels, a generator chamber, a main transformer chamber, a tail water control chamber and two tail water tunnels and arrange in the basalt mountain on the right bank of the dam. Based on the brief introduction of cavity arrangement, geological conditions, monitoring design and execution, the deformation magnitude and deformation characteristics of the three major cavities are focused on analyzing. The stability of the cavities is evaluated. The quality of the surrounding rock masses of the underground cavities of the Guandi Hydropower Station is good and the deformation is normally less than 30mm. However, some parts have large deformation due to the influence of the structure surfaces and the maximum deformation is 61.49 mm. Most of the parts with larger deformation are the middle and upper positions of the side walls and rock anchor beam positions. The structure surfaces have noticeable action for controlling the surrounding rock mass deformation. The stability of the cavities is good.

Research on the Bearing Capacity for Rock Bolt Crane Girder in the Underground Powerhouse of Large Hydropower Station

2011 ◽  
Vol 255-260 ◽  
pp. 3563-3567
Author(s):  
Jian Bin Xie ◽  
Tian Chun He ◽  
Ji Yao ◽  
Chen Bo Zi
Keyword(s):  
Bearing Capacity ◽  
Design Criterion ◽  
Rock Bolt ◽  
Hydropower Station ◽  
Safe Operation ◽  
Underground Powerhouse ◽  
Geological Conditions ◽  
Enterprise Standard ◽  
The Stability ◽  
Rock Section

In this paper, according to the reality that there is no mature Chinese national design criterion but partial enterprise standard for rock bolt crane girder in the underground powerhouse of large hydropower station up to now. Based on the geological conditions, the rock bolt crane girder was designed by using method of rigid body equilibrium. The reinforced anchoring measures for rock bolt crane girder in undesirable geology were studied subsequently by the experience of analogous projects. The stability of rock bolt crane girder in underground powerhouse was analyzed and evaluated by Finite Element Method (FEM). Then the bearing capacity of crane beam was researched by means of bearing testing. The results show FEM is practicable to evaluate the stability of the rock bolt crane girder and to guide the rock bolt crane girder designing. The results also show the reinforced anchoring measures are appropriate to displace the undesirable surrounding rock section by using concrete. The results of bearing testing show that the design of rock bolt crane girder and its anchoring measures are rational, and crane girder can meet to the requirement of safe operation.

Formation and Stablity of the Sky Pond Landslide Dam, China

2011 ◽  
Vol 243-249 ◽  
pp. 3189-3200 ◽  
Author(s):  
Yan Hui Song
Keyword(s):  
Yellow River ◽  
Limit Equilibrium ◽  
Landslide Dam ◽  
Equilibrium Analysis ◽  
Qualitative Assessment ◽  
Hydropower Station ◽  
The Yellow River ◽  
Geological Conditions ◽  
Dammed Lake ◽  
The Stability

The Sky Pond landslide dam is located in Muchang valley, a branch of the Yellow River branches. From this point it is about 6Km to the mouth of the valley from where the Yellow River flows 0.8Km downwards to the planned Jishi gorge hydropower station. The Sky Pond landslide dam is actually formed by two landslides from both the left and right bank slopes and completely blocks the seasonal river channel. The volume of the landslide dam is about 14 millions m3 with 2.37 millions m3 water stored in the dammed lake under the condition of perennial mean water level. Because (1) the dam body is large in width and thickness; (2) the dammed lake water is small both in volume and weight compared to the landslide dam; (3) recharge to the dammed lake is basically the same as the discharge every year; and (4) there is a natural spillway in the dam body, the landslide dam is present at least 750 years after its formation. Although landslide dams which have existed for several hundreds to thousands of years are generally considered as stable, there are remains which may fail catastrophically. In order to analyze the stability of the Sky Pond landslide dam and provide justification for the future engineering decisions, this paper describes the engineering geological conditions near the landslide dam and the characteristics of the dam body, and a detailed discussion of the formation mechanism of the landslide. Based on engineering geology investigation, a qualitative assessment of the stability of the dam and an analysis of the probability of dam overtopping and piping is carried out. Limit equilibrium analysis has been used to calculate the stability of the dam slope under various operational conditions. Results of the stability analyses indicate that the Sky Pond landslide dam should remain stable and does not present a potential theat to the planned hydropower station.

scholarly journals A HEADRACE TUNNEL RECONSTRUCTION IN TURKEY

2019 ◽  
Vol 23 ◽  
pp. 25-30
Author(s):  
Matouš Hilar ◽  
Martin Srb ◽  
Jakub Nosek
Keyword(s):  
Power Station ◽  
Remotely Operated Vehicle ◽  
Rock Bolts ◽  
Hydro Power ◽  
Sprayed Concrete ◽  
Tunnel Section ◽  
Headrace Tunnel ◽  
Drill And Blast ◽  
Power Project ◽  
Single Shell

The operation of a hydro power project in North Turkey started in 2015, included the 12km long headrace tunnel. An 8km long lower tunnel section was excavated by double shield TBM technology with 8.7m ID. Due to problems with the mechanised excavation, a 4km long upper tunnel section was excavated conventionally by the Drill and Blast method with single shell lining generated from fibre reinforced sprayed concrete and rock bolts. Significant operational problems were observed in September 2016. The flooded tunnel was investigated by underwater Remotely Operated Vehicle which indicated significant collapses. Operation of the power station had to be stopped and water from a supply dam at the headrace tunnel inlet had to be discharged to enable dewatering and inspection of the tunnel. Consequent investigation revealed three major collapses and a considerable variety of other damages in the D&B section of the tunnel. Repair and strengthening of the tunnel was completed in October 2017.

Analysis for the Seepage Stability of the Upstream Cofferdam of One Hydropower Station

2013 ◽  
Vol 441 ◽  
pp. 286-290
Author(s):  
Yu Lin Yuan ◽  
Yun Feng Peng
Keyword(s):  
Safety Factor ◽  
Theoretical Basis ◽  
Circle Method ◽  
Control Design ◽  
Hydropower Station ◽  
Software Analysis ◽  
Seepage Control ◽  
Geological Conditions ◽  
The Stability

According to the geological conditions of upstream cofferdam and foundation of the hydropower station, analysis for the seepage of the upstream cofferdam used SEEP/W module of Geo-studio software. Analysis for the stability used SLOPE/W module with Swedish circle method and Bishop method. Safety factor of the upstream and downstream in different conditions was obtained. The results show that the design of the upstream cofferdam was reasonable, and it will provide theoretical basis for Seepage control design of cofferdam.

Research on Similar Materials for Rheological Test of Hard Rock Mass

2017 ◽  
Vol 744 ◽  
pp. 169-173
Author(s):  
Long Yun Zhang ◽  
Shang Yang Yang
Keyword(s):  
Rock Mass ◽  
Model Test ◽  
Rheological Behavior ◽  
Mechanical Model ◽  
Mechanical Tests ◽  
Surrounding Rock ◽  
Hydropower Station ◽  
Similar Material ◽  
Geological Conditions ◽  
Deep Rock

The analog material, used in the Geo-mechanical model test that is designed to study the unloading rheological behavior and failure characteristics of rock mass, must reflect the physico-mechanical behaviors of the actual rock mass. The surrounding rock of Meng-di-gou hydropower station is in complex geological conditions. With the excavation of the rock mass, the surrounding rock gradually unloading, and the property of the near rock mass. It is necessary to carry out Geo-mechanical model test to study the rheological properties of deep rock mass under complicated geological conditions. So the similar material, comprised of iron powder, barite powder, and quartz sands bound with a solution of alcohol and colophonium, is suggested to be improvable. Firstly, through more than 300 groups of mix proportion tests, the influence of different mix proportions of the ingredients are analyzed to obtain the optimal analog materials; Secondly, more than 1200 specimens are made into size Φ50mm×100mm; Lastly, physico-mechanical tests were conducted by using the specimens to test the mechanical property of the similar material, and the basic physico-mechanical parameters are obtained from the analog material. The results indicates that the property of the similar material matches well with that of the rock mass in site, so the similar material is suitable for the Geo-mechanical model test, and it can be used to test the unloading rheological behavior of rock mass of Meng-di-gou hydropower station.

MATLAB Calculation of Hydraulic Transients in Hydropower Simulation Application

2011 ◽  
Vol 219-220 ◽  
pp. 346-350
Author(s):  
Heng Lei ◽  
Ying Li
Keyword(s):  
Process Analysis ◽  
Operation Mode ◽  
Water System ◽  
Transition Process ◽  
Hydropower Station ◽  
Power Station ◽  
Hydraulic Transients ◽  
Power Operation ◽  
System Design Optimization ◽  
The Mathematical Model

In hydropower station in the operation of total with hydraulic transient process of the power station on the transition process analysis and calculation is quite important. This paper introduces the today's advanced scientific computing software MATLAB, and using the software of the Zipingpu hydropower station hydraulic transients from the mathematical model and calculation simulation etc is analyzed and calculated with research, in order to seek appropriate power operation mode, unit close regularities. For power station and water system design optimization, safe operation, provides the basis.

Application of Fuzzy Recognition Model for the Diversion Structures Safety Evaluation at Small Hydropower Stations

2014 ◽  
Vol 687-691 ◽  
pp. 3686-3690
Author(s):  
Ming Li ◽  
Xue Feng Yu ◽  
Yuan Dong Wei
Keyword(s):  
Safety Evaluation ◽  
Hydropower Station ◽  
Hydroelectric Power Station ◽  
Hydroelectric Power ◽  
Power Station ◽  
Small Hydropower ◽  
Recognition Model ◽  
Fuzzy Recognition ◽  
Hydropower Stations

In this passage is about the safety evaluation on the conveyance structure of small hydroelectric power station. Applying Binary comparative indicators to determine the weights and fuzzy recognition model on the conveyance structure of small hydroelectric power station’s assessment. Compared other models with fuzzy recognition model which will be explained in detail in the next section on a specific small hydropower station. The results show that the fuzzy recognition model is feasible and effective on safety evaluation on the conveyance structure of the hydroelectric power station.

Analysis on Causes of Deformation and Failure of Large Scale Underground Powerhouse

2011 ◽  
Vol 71-78 ◽  
pp. 644-650 ◽  
Author(s):  
Jin Yu Dong ◽  
Ji Hong Yang ◽  
Guo Xiang Yang ◽  
Fa Quan Wu
Keyword(s):  
Large Scale ◽  
Shear Failure ◽  
Surrounding Rock ◽  
Concrete Cracking ◽  
Underground Powerhouse ◽  
Deformation And Failure ◽  
Underground Caverns ◽  
Geological Conditions ◽  
The Right

Jinoping No.1 is a dominant reservoir cascade hydropower station which locates at the downstream of Yalong river. The underground powerhouse locates at the right bank of the dam, lithology is marble that belongs to the second member of Zagunao group. It is constructed at region with very complicated geological conditions and high geo-stress. Concrete cracking, spalling and steel buckling and bending occurred at the downstream crown after supporting. This paper analysed the causes of deformation and failure through geological analysis and numerical simulation, and concluded that deformation and failure mainly occurred at the region where the quality of surrounding rock belongs to Ⅲ1 and had nothing to do with the unstable block cut by cracks; stress field of surrounding rock varied continueously with the proceeding of successive excavation of underground powerhouse, so the compressive stress and shear stress concentration occurred which caused the compression and shear failure of downstream crown and made it bending to the free face. It is significant to the further enforcement of this project and to the research on other similar underground caverns theoretically and practically.

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