scholarly journals Calculation and Analysis of the Stability of Steel Lining Structure of the Flat Tunnel Manhole in a High-head Power Station

2021 ◽  
Vol 826 (1) ◽  
pp. 012063
Author(s):  
Gaohui Li ◽  
Fei Yang ◽  
Xuesong Yu ◽  
Du Wu ◽  
Huan Wang ◽  
...  
Keyword(s):  
Power Station ◽  
Steel Lining ◽  
Lining Structure ◽  
High Head ◽  
The Stability

Limit Depth of Rock Mine Shafts for Underground Shelters

2017 ◽  
Vol 755 ◽  
pp. 198-201 ◽  
Author(s):  
Alexander N. Kravcov ◽  
Pavel Svoboda ◽  
Vaclav Pospíchal ◽  
Dmitry V. Morozov ◽  
Pavel N. Ivanov
Keyword(s):  
Mathematical Models ◽  
Geological Data ◽  
Power Station ◽  
Rock Property ◽  
Mathematical Properties ◽  
Fallout Shelters ◽  
The Stability ◽  
Selection Of

Today, especially after the several technical accidents, the last one in France Flamanville power station near Cherbour in January 2017 risks of the nuclear hazards due to technical, terrorist or military accidents continually rising. In this situation is of a great importance to start with a retrofit those of underground spaces that was decommissioned in last years and to start thinking about reuse of mining shafts as a fallout shelters for protection of civil population. And the first step is to start with selection of the identify spaces with a mathematical models for selection of the rocks massifs that can be useful for porpoise of the underground shelters. The need to utilise specific geological data, which project organisations usually do not have available. The physical-mathematical properties of rocks are not sufficiently portrayed in these methodologies, which complicates execution of calculations and reduces the credibility of these calculations. The methodology for calculating the stability of rocks around a mine works proposed in the article enables resolution of the task complexly for the conditions of individual deposits, utilising the generalised values of rock property indicators.

Research on the Large Disturbance Characteristics of the Pumped Storage Motor with the Time-Stepping FEM Consequently

2015 ◽  
Vol 740 ◽  
pp. 339-342
Author(s):  
Sheng Huang ◽  
Jin Ping Kang
Keyword(s):  
Working Condition ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
The Other ◽  
Power Station ◽  
Time Stepping ◽  
Overall Efficiency ◽  
Pumped Storage ◽  
The Stability ◽  
Large Disturbance

In recent years, the proportion of pumped storage power station in the power grid is increasing, which has many special advantages. The pumped storage motor has two kinds of working condition of generator and motor, not only can the system regulate the reactive power, but also can modify the power factor of the grid resulting in the reduction of the investment on the reactive-power-compensation equipment. On the other hand, the above system is able to enhance both the stability and the overall efficiency. Pumped storage motor start-stop and working condition switch frequently. The test will be analysis and researched with the Time-stepping FEM Consequently, this paper analyses the large disturbance characteristics of the pumped storage motor.

Stability Analysis about the Impact of Soft Rock to the Underground Cavern Group

2013 ◽  
Vol 706-708 ◽  
pp. 560-564
Author(s):  
Yi Huan Zhu ◽  
Guo Jian Shao ◽  
Zhi Gao Dong
Keyword(s):  
Finite Element ◽  
Rock Mass ◽  
Stability Analysis ◽  
Soft Rock ◽  
Element Model ◽  
Underground Excavation ◽  
Power Station ◽  
Excavation Process ◽  
The Stability ◽  
The Impact

Soft rock is frequently encountered in underground excavation process. It is difficult to excavate and support in soft rock mass which has low strength, large deformation and needs much time to be out of shape but little time to be self-stabilized. Based on a large underground power station, finite element model analysis was carried out to simulate the excavation process and the results of displacement, stress and plasticity area were compared between supported and unsupported conditions to evaluate the stability of the rock mass.

scholarly journals The Influence Evaluation of the Waste Slag Above Tunnel on the Safety of the Structure of the High-Speed Railway Tunnel

2020 ◽  
Author(s):  
Weigong Ma ◽  
Weibo He
Keyword(s):  
High Speed ◽  
Great Influence ◽  
Back Analysis ◽  
Tunnel Lining ◽  
Tunnel Structure ◽  
Destructive Testing ◽  
High Speed Railway ◽  
Lining Structure ◽  
Design Documents ◽  
The Stability

A high-speed railway loess tunnel being built is in the Shallow-Buried Section because the construction party violates the design, and the slag discarded at the top of the tunnel is just down-pressing the main line. In order to ensure that the stability of tunnel structure does not affect the safe operation in the later period, a stratum structure model is established based on non-destructive testing and on-site tunnel monitoring measurement. The parameters of surrounding rock are determined by displacement back analysis method, and the influence of waste slag on the safety of tunnel structure is checked by the parameters obtained from back analysis. Through the comparative analysis of the stress of tunnel lining under two working conditions, combined with relevant codes and design documents, it is considered that the slag has a great influence on the stress of tunnel lining structure, but the sectional strength and maximum crack width of eccentrically compressed components of tunnel lining meet the design requirements, and the structure is within the safety range.

Studies on the Grid-Connected Characteristics about Large-Scale Photovoltaic Power Station in Weak Grid Systems

2011 ◽  
Vol 347-353 ◽  
pp. 639-646
Author(s):  
Hui Jiang ◽  
Zhi Wei Li ◽  
Xin Zheng
Keyword(s):  
Theoretical Basis ◽  
Large Scale ◽  
Transient Stability ◽  
Energy Strategy ◽  
Power Station ◽  
Grid Systems ◽  
Weak Grid ◽  
Good Consistency ◽  
New Energy ◽  
The Stability

This paper made some researches of modeling on the systems of the large-scale photovoltaic（PV） power station, and established the PV model, the rectifier and inverter circuits and so on. Using MATLAB and PSASP, simulation and analysis of grid-connected characteristics about the large-scale PV power station in weak grid systems were carried out, focusing on the transient stability in the fault condition of the line-side and the power quality. These two simulation results had good consistency, which demonstrated the accuracy of the large-scale PV power station model in this paper and the analysis of its grid-connected characteristics. The conclusion of this paper will provide some theoretical basis of improving the stability of grid-connected and reducing the harmonic current in weak grid systems, and will also provide some theoretical basis and the guide of grid-connected for the new energy strategy of our country in the future.

scholarly journals Effects of Dam Gate Geometry on Pressure Variation Aided by Map Presentation

2020 ◽  
Vol 10 (2) ◽  
pp. 44-52
Author(s):  
Sheeraz M. Ameen ◽  
Thamir M. Ahmed
Keyword(s):  
Power Plants ◽  
High Water ◽  
Water Levels ◽  
Bottom Surface ◽  
Contour Maps ◽  
Hydraulic Design ◽  
Vertical Lift ◽  
High Head ◽  
The Stability ◽  
Surfer Software

The dam vertical lift gate is one of the most important operational parts that regulate the high head water flow to power plants as well as satisfying the water needs for projects and areas downstream of the dam. Due to the high water levels in the dam reservoir, the gates are subjected to many hydrostatic and dynamic pressures that affect their performance and stability. Hence, it became necessary to study all parameters that may cause excessive pressures which may lead to reduce the gate performance efficiency or even cause failure. In the current study, the pressure distribution along the bottom surface of various gate lip shapes has been measured and presented as contour maps using Surfer software. The pressure fluctuation was observed to indicate the intensity of flow separation and reattachment which, in turn, causes a vibration that may threaten the stability of the gate or impede its proper functioning. The pressures in this study are expressed as a dimensional coefficient through the integration of pressure measurements at 8 points distributed over the bottom gate surface. The high intensity of pressure attachment indicates the critical condition for hydraulic design.

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