【作者】 张宇；

【导师】 孙如华； 钟储汉；

【作者基本信息】 中国矿业大学 ， 地质工程（专业学位）， 2021， 硕士

【摘要】 位于四川省宣汉县的某气田是我国规模最大、丰产最高的特大型海相整装酸性气田,采出的天然气高含硫化氢有毒气体,安全风险高。自2020年雨季以来,由于宣汉县局部地区连续降雨,引发了该气田的厂站、阀室、管道线路、厂区道路及其附近区域发生了大量滑坡、崩塌等次生地质灾害,对国家和人民的生命财产造成了巨大的威胁,同时影响了气田的正常运行和周围人的正常生活秩序。为了有效地防治气田及周边地区地质灾害,保证气田的正常运行和周边人群的安全,对气田区地质灾害危险性进行评估是十分必要的。本文以该气田为研究区域,通过资料收集与野外调查,总结了研究区地质灾类型及分布特征,采用模糊数学综合评判法对研究区危险性进行了等级分区,本文主要取得的成果如下:(1)通过对研究区地质灾害的资料收集和初步调查,结合区域地质背景对研究区的不稳定斜坡、滑坡、崩塌和水毁的发育特征、分布特征以及典型的灾害进行总结分析。(2)选取高程、坡度、坡向、地质构造、岩性、降雨、水系、道路、植被等9个指标作为地质灾害危险性评价因子。采用信息量理论对因子进行信息量计算,再用熵权法计算权重;最后结合模糊数学综合评判法,以区域地质灾害信息量为基础数据,计算区域内不同地质灾害危险性等级的隶属度,进行了地质灾害危险性等级分区。(3)结合预测的研究区地质灾害危险性等级,分析了管线周边1km范围的危险性;同时根据收集到的滑坡位移监测数据与同时期降雨量数据,分析降雨量与区内滑坡位移之间关系;最后结合分析成果从监测预警措施和工程治理两个方面提出防治措施和对策。该论文有图64幅,表22个,参考文献75篇更多还原

【Abstract】 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;The risk of the study area was classified by using the comprehensive evaluation method of fuzzy mathematics.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.The prevention and control measures and countermeasures are proposed from monitoring and early warning measures and project management.The paper has 64 diagrams,22 tables and 75 references.更多还原