Geological Disasters Of Gigantic Thermal Power Plants Based On GIS Hazard Assessment Study

In recent years,China's economy is at a high-speed development stage and has reached a whole new level in energy development and utilization.With the implementation of "transmission of electricity from the west to the east",China's power grid construction is advancing rapidly and is changing with each passing day.In order to meet the continuous demand for electric energy from all walks of life,the construction of traditional thermal power plants is gradually moving towards the direction of very large thermal power plants.In recent years,the construction of very large thermal power plants is mostly a comprehensive utilization project,which has led to a doubling of the area they require.In addition,China has been emphasizing the strategic concept of sustainable development such as low-carbon environmental protection.Power plants are mostly laid out in mountainous areas.Mountainous areas are different from other regions.A series of factors such as topography and geomorphology,stratigraphic structure,regional geological stability,differences in fault structures,meteorological and hydrological conditions,complexity of hydrogeological conditions,and the strength of human engineering activities have given China the construction of thermal power plants.As well as later operation management,it has brought great harm and loss.Therefore,in order to enable the smooth construction and safe operation of thermal power plants,and to protect the personal and property safety of residents in the area affected by the plant area,it is of great practical significance to carry out geological disaster risk assessment research on the area of ultra-large thermal power plants at this stage.Risk assessment is the information extracted from the comprehensive analysis of basic geological environmental condition data and induced condition data.Different regions have different basic data and disaster-induced conditions,and different methods and processes for information acquisition.Therefore,it is difficult to standardize the indicators and descriptions of regional geological disaster risk assessment.In order to analyze and study the geological disaster risk assessment of thermal power plants,this paper takes the "Datang Shaanxi Xiwangzhai Coal and Electricity Integrated Project Power Plant 2×1000MW New Construction Project" as the research object,according to the existing basic data and information on the research area The distribution characteristics and rules of the geological hazards and the formation control factors were analyzed and studied.The GIS software was combined with the deterministic coefficient method to establish a risk prediction model for geological hazards in the study area.Finally,the risk zoning results of the study area were obtained and the following conclusions were obtained:(1)The paper analyzes the importance of geological hazard risk assessment for very large thermal power plants,summarizes the concepts and principles of regional geological hazard risk assessment,and presents the advantages of using GIS technology combined with deterministic coefficient method to apply geological hazard risk assessment.And principles,elaborate the process of obtaining basic data of geological disasters and the principles of selecting and establishing risk assessment indicators.(2)Taking the "Tangtang Shaanxi Xiwangzhai Coal and Electricity Integrated Power Plant 2×1000MW New Construction Project" as an example,the engineering geological conditions and disaster distribution rules,development characteristics,influencing factors,and formation mechanism of the study area were described and analyzed;Index factors such as elevation,slope,aspect,slope structure,lithology,vegetation cover type,and water distance were selected as basic factors,and human engineering activities and atmospheric rainfall were used as triggering factors.Based on GIS technology and deterministic coefficient method calculation principles,The Z value of the index factor was calculated,and the important factors that affected the occurrence of geological disasters in the study area were selected according to the Z value: elevation,slope,human engineering activity,formation lithology,aspect,slope structure,and distance of the water system.(3)The enumerated method was used to divide the selected important index factors into various combinations according to the Z value.Based on GIS technology,the AUC curve test method was used to examine the overlay analysis results of these multiple factor combinations,and finally selected.The best combination of factors is: elevation,slope,formation lithology,ergonomics,slope structure type,and water system distance.(4)The final analysis result of the geological hazard risk assessment of the study area was determined as the superposition analysis result of the combination of elevation,slope,stratigraphic lithology,human engineering activities,slope structure types,and water distance factors,and the evaluation results were divided into high,medium,and low risk.District level.By conducting a geological disaster risk assessment study on the Xiwangzhai super-large thermal power plant area in Shaanxi,the zoning results have practical guiding significance for the construction of a super-large thermal power plant in a nearby area with similar geological environmental conditions and induced conditions.The division of geological hazard risks in the construction area of nearby large thermal power plants can refer to the results of this division.