川藏铁路理塘段毛垭坝盆地不良地质体浅层地震勘查  

Shallow seismic explorations on unfavorable geological bodies in the Maoyaba basin of the Litang section of the Sichuan-Tibet railway

作　　者：曹云勇[1] 黄韬 尹小康[1] 周佩华 夏波 CAO YunYong;HUANG Tao;YIN XiaoKang;ZHOU PeiHuang;XIA Bo(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Sichuan Institute of Geological Engineering Group Co.,Ltd.,Chengdu 610072,China;School of Geophysics,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中国中铁二院工程集团有限责任公司,成都610031 [2]四川省地质工程勘察院集团有限公司,成都610072 [3]成都理工大学地球物理学院,成都610059

出　　处：《地球物理学进展》2022年第2期774-785,共12页Progress in Geophysics

基　　金：中铁二院工程集团有限责任公司川藏铁路项目基金(KDNQ203001);四川省科技厅重点研发项目基金(2019YFG0460,2020GZYZF0010)联合资助.

摘　　要：川藏铁路是我国正在规划的具有重大战略意义和巨大经济价值的铁路,其位于地形地貌和地质构造极为复杂的青藏高原中东部,铁路规划建设面临着一系列迫切需要解决的地质问题和工程问题.为了精准对接铁路定测与先期开工段的地质需求,进一步聚焦活动断裂及高位滑坡地质灾害这两个重要科学问题,开展了对川藏铁路康定—昌都段毛垭坝盆地理塘—德巫断裂及乱石包高速远程滑坡体的浅层地震勘探,取得了一些新的认识.理塘断裂往毛垭坝盆地内发育了一条隐伏断裂,该断裂倾向NE,倾角约65°,是一条走滑为主,兼具逆冲的断裂.由于理塘断裂历史上曾经发生过7.3级地震,因此在川藏铁路理塘—巴塘线路穿越该断层位置需采取一定的加护措施.毛垭坝盆地中部发育一条正断层,该断层走向近东西,近乎直立,且该断层和毛垭坝盆地南、北缘断裂性质相同,是区域近南北向拉张变形作用下的产物.乱石包滑坡堆积区从靠近山脊位置到滑坡体前缘依次为横向脊发育区,纵向脊发育区和小丘体区.川藏铁路禾尼乡站线路从横向脊发育位置经过,该位置堆积层厚度在线路上有所变化,很可能是由于碎屑流减速改造下部地形所引起的,后期铁路建设需针对滑坡堆积层厚度的变化采取不同的支护措施.The Sichuan-Tibet railway is a railway of great strategic significance and great economic value that is being planned in China.It is located in the middle and eastern part of the Qinghai-Tibet Plateau where the topography and geological structure are extremely complex.The railway planning and construction are faced with a series of geological and engineering problems that need to be solved urgently.In order to exactly meet the geological requirements for the location survey and the early start-up phase,and to further focus on some important scientific problems on geological hazards,such as active faults and high long-runout geohazard,shallow seismic explorations have been carried out for the Litang-Dewu fault and the Luanshibao high-speed long-runout landslide in the Maoyaba basin of the Kangding-Changdu section of the Sichuan-Tibet railway,and some new understandings were achieved.A concealed fault was found developed in the Maoyaba Basin,and it is considered as the extension of the Litang fault.This fault has a NE inclination with an angle of about 65°.It is a strike-slip fault with a thrust component.Since the Litang fault has experienced a magnitude 7.3 earthquake in history,certain protections need to be taken when the Litang-Batang route of the Sichuan-Tibet railway crosses this fault.A normal fault develops in the middle of the Maoyaba Basin.This fault strikes east-west and occurs almost vertically.The fault has the same properties as the fault in the southern and northern margins of the Maoyaba Basin.It is the product of the region's near-south-north extensional deformation.From the location near the mountain to the front edge of the landslide,the accumulation region of the Luanshibao landslide is divided into three areas,transverse ridge area,longitudinal ridge area,and hilly mounds area.The route of Henixiang station of the Sichuan-Tibet railway passes through the position where the transverse ridges developed.The thickness of the accumulation layer at this position changes from position to position.Th

关 键 词：浅层地震勘查 理塘断裂毛垭坝盆地隐伏段 毛垭坝盆地正断层 乱石包滑坡体结构 

分 类 号：P631[天文地球—地质矿产勘探]