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大瑞铁路高黎贡山越岭段（高地震烈度区）地质灾害易发性评价
Geological Disasters Geo-hazard Susceptibility Evaluation of Across the Gao Ligong Mountains Area in Darui-Railway (The High Earthquake Intensity Region)
【作者】 邓韧；
【导师】 许强；
【作者基本信息】 成都理工大学 ， 岩土工程， 2011， 硕士
【摘要】 大瑞铁路穿行于青藏高原南东缘之横断山脉南段,它是我国第一条穿越横断山脉的国家Ⅰ级铁路线。研究区高黎贡山越岭段地质环境条件复杂,崩、滑、流等地质灾害极为发育,伴随着西部大开发战略的贯彻落实,各种线性工程(公路、铁路、石油管道等)在高黎贡山地区大规模建设,工程地质评价备受关注。汶川8.0级特大地震给国家的基础设施造成了巨大破坏,经济损失严重,救援工作难以正常开展。因此,论文针对铁路线选线工作需要,对研究区进行降雨工况、强震+降雨工况地质灾害易发性评价。论文在充分分析野外地质灾害调查资料的基础上,总结了研究区地质灾害类型及分布规律,归纳了地质灾害易发性影响因素。结合汶川8.0级地震诱发地质灾害分布规律提出的“三种因素十大效应”及龙陵7.4级地震地质灾害发育特征,建立了以历史因素、基本因素和诱发因素为一级评价指标的降雨工况和强震+降雨工况评价指标体系。相比降雨工况,后者多考虑了与地震有关的断层控制因素。两种工况均选取模糊综合评判模型作为基本数学模型,采用层次分析法(AHP)确定评价指标权重。评价过程基于ArcGIS软件工作平台,将1:50000比例尺航片解译地质图按50m×50m划分为约149万个评价单元,选择怒江断裂、泸水-瑞丽断裂、龙陵-澜沧江断裂为强震+降雨工况拟发震断裂,按照低易发性、中易发性、高易发性、极高易发性的四级评价进行两种工况下的地质灾害易发性评价。评价结果表明,不同工况不同断裂发震其评价结果显著不同,降雨工况、怒江断裂发震、泸水-瑞丽断裂发震、龙陵-澜沧江断裂发震情况下的极高易发区面积均在200~300km2左右,分别占总面积的7.2%,8.4%,9.2%,6.7%。沿铁路线极高易发区主要集中在怒江东岸河流深切陡坡地带、高黎贡山山脉断裂密集发育区及凹子地。对比1976年龙陵地震(怒江断裂发震)地质灾害分布,评价结果与客观实际基本吻合。评价模型为工程建设提供了强有力的技术支撑。
【Abstract】 Darui-Railway through in south of Hengduan Mountains which is in the south-east of qinghai-tibet plateau. It is the firstⅠlevel railway which through the Hengduan Moun- tains in our country. The geological environmental conditions of the research region that across Gao Ligong Mountains area is complex.There devleloped many geological hazards, such as collapses, landslide, debris flow and so on. With the implementation of the strategic development of western China, various kinds of linear geo-engineering projects( like highway, railway, oil pipeline) are large-scale constructed in this area.The engineering geological evaluation is under the spotlight. Wenchuan 8.0 earthquake to the state’s infrastructure caused great destruction, economic lost serious, the rescue work hard to develop smoothly. So, thesis aims at the need of railway lines location, to evaluate the susceptibility of geological hazard for rainfall condition and strong earth- quake + rainfall condition.Based on the full analysis geological hazard material which survey in the field, sum- marize the research area geological hazards type and distribution, conclude the influen- cing factors of geological disasters geo-hazard susceptibility. Combined with the geol- ogical hazards distribution of Wenchuan 8.0 earthquake proposing”Three factors ten effect”and Longling 7.4 earthquake’s, establish rainfall condition and strong earthqua- ke + rainfall condition evaluation index system which take the historical factors, the basic factors and inducing factors as the first level evaluation index. Compared with the rainfall condition, the other considering the faults control factors which associated with earthquake. Both conditions are selection fuzzy comprehensive evaluation model as the basic mathematical model. Using analytic hierarchy process( AHP) determining the evaluation indexes weights. The evaluation process based on ArcGIS software platform. 1:50000 scale navigation piece interpretation frontpiece is divided into about 1.49 million sssessment units. Choose nujiang river fracture, lushui-ruili fracture, longling- lancang river fracture as the seismogenic fault of strong earthquake + rainfall condition. Two kinds of geological disasters geo-hazard susceptibility are evaluated, that accord- ing to four level geo-hazard susceptibility, they are low in geo-hazard susceptibility, geo-hazard susceptibility, high geo-hazard susceptibility and remotest geo-hazard susceptibility.The evaluation results show that different conditions and under different fracture seismogenic its evaluation results significantly different. The area of the remotest geo- hazard susceptibility region is around 200~300 km2 when in the rainfall condition and in the condition of nujiang river fracture, lushui-ruili fracture, longling-lancang river fracture seismogenic. They accounted the total area for 7.2%, 8.4%, 9.2%, 6.7%. The remotest geo-hazard susceptibility area along the railway lines are mainly concentrated in eastern of nujiang river deep steep zone, and the zone of fracture intensive develop- ment in Gao Ligong Mountains and Ao Zidi. Contrast the distribution of geological hazards of Longling earthquake in 1976 ( nujiang river fracture seismogenic), the eva- luation results and objective reality are mostly fitted. A strong technical support in engineering construction is provided by evaluation model.