| A gas field is the largest and most productive marine acid gas field in China.The production of natural gas is high in hydrogen sulfide and toxic gas,and the safety risk is high.Since the rainy season of 2020,the continuous rainfall in puguang town,Xuanhan County,has caused a large number of secondary geological disasters,such as landslides,collapses,etc.,it poses a great threat to the life and property of the country and the people,and affects the normal operation of the gas field and the normal life order of the people around.In order to effectively prevent geological hazards in gas field and its surrounding area,ensure the normal operation of gas field and the safety of surrounding people,it is very necessary to evaluate the geological hazards of a gas field.This paper takes a gas field as the research area,through data collection and field investigation,summarizes the types and distribution characteristics of geological disasters in the research area;uses GIS to divide the dangerous areas of the research area;analyzes the relationship between landslide displacement and rainfall.The main results of this paper are as follows :(1)Through the data collection and preliminary investigation of the geological hazards in the study area,based on the regional geological background,the development characteristics,distribution characteristics and typical disasters of unstable slopes,landslides,collapses and floods in the study area are summarized and analyzed.(2)Elevation,slope,slope aspect,geological structure,lithology,rainfall,water system,road and vegetation are selected as risk evaluation factors of geological hazards.The information quantity theory is used to calculate the information quantity of the factors,and then the entropy weight method is used to calculate the weight.Finally,the fuzzy mathematics comprehensive evaluation method is used to calculate the membership degree of different geological hazard grades in the region and divide the hazard grades of geological hazard based on the information content of regional geological hazard.(3)According to the forecast geological hazard risk grade in the study area,the danger of 1 km around the pipeline is analyzed,and the relationship between rainfall and landslide displacement is analyzed by collecting landslide displacement monitoring data and rainfall data in the same period.(4)Combined with the prediction of the risk level of the study area and monitoring data analysis,the prevention and control measures of geological disasters around the pipeline are proposed.The paper has 64 diagrams,22 tables and 75 references. |
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