基于层次分析法的青海拉加滑坡群影响因素分析  

Influence Factor Analysis of the Lajia Landslide Group Based on Analytic Hierarchy Process

作　　者：李成林 刘严松 赖思翰 王地 何星慧 刘雅兰 LI Chenglin;LIU Yansong;LAI Sihan;WANG Di;HE Xinghui;LIU Yalan(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;Cecep Construction Engineering Design Institute Limited,Chengdu 610059,China;Chengdu Center,China Geological Survey,Chengdu 610081,China;China University of Geosciences,Beijing 100083,China;Sichuan Sumhope Spatial Technology Co.,Ltd.,Chengdu 610094,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]中节能建设工程设计院有限公司,四川成都610059 [3]中国地质调查局成都地质调查中心,四川成都610081 [4]中国地质大学,北京100083 [5]四川三合空间科技有限公司,四川成都610094

出　　处：《地理空间信息》2023年第9期36-39,80,共5页Geospatial Information

基　　金：四川省自然资源厅基金资助项目(KJ2016-07);四川省教育厅基金资助项目(18ZB0065);青海省科技厅重点研发资助项目(2019-SF-130)。

摘　　要：以青藏高原东北缘拉加新近系红层区的典型滑坡群为研究对象,对区内地质环境背景、滑坡地质特征进行了认识,厘定了滑坡的内外影响因素,并利用层次分析法(AHP)定量计算了各影响因素的权重,确定了权重次序,总结了研究区滑坡的形成演化过程。结果表明,区内滑坡的空间分布与新近系紫红色湖相碎屑岩地层关系密切,集中发育于每年的6—9月,与区内集中降雨期重叠。在反复冻融、地质构造、工程活动、地震等因素叠加作用下,岩层强度进一步降低,集中降雨诱发最终形成滑坡地质灾害。区内滑坡影响因素权重分析显示,CR=0.0904,滑坡影响因素选取合理,影响作用由强到弱依次为地层岩性、降雨、冻土冻融、地下水、地质构造、工程活动、地形地貌、地震。In this paper,we selected the typical landslide group in the red bed area of Lajia Neogene in the northeast edge of Qinghai Tibet Plateau as the research object,recognized the geological environment background and geological characteristics of landslide,determined the internal and external influence factors of landslide,calculated the weight of each influence factor quantitatively by using the analytic hierarchy process(AHP),determined the weight order of influence factors,and summarized the formation and evolution process of landslide in the study area.The results show that the spatial distribution of landslides in the area is closely related to the Neogene purplish red clastic rock stratum.Landslides in the area are mainly developed from June to September,which overlaps with the concentrated rainfall period in the area.Under the superposition of repeated freezing and thawing,geological structure,engineering activities,earthquake and other factors,the rock stratum strength is further reduced,and the landslide geological disaster is finally formed induced by concentrated rainfall.The weight analysis of landslide influence factors shows that CR=0.0904,the selection of landslide influence factors is reasonable,and the effects of influence factors from strong to weak are formation lithology,rainfall,frozen soil freezing and thawing,groundwater,geological structure,engineering activities,landform and earthquake.

关 键 词：地质特征 影响因素 AHP 高原红层 拉加滑坡群 

分 类 号：P237[天文地球—摄影测量与遥感]