殷志强^1,,
孙东^2,,,
张瑛³,
邵海¹,
陈亮³
1. 中国地质环境监测院, 北京 100081
2. 四川省地质矿产勘查开发局, 成都水文地质工程地质中心, 四川 成都 610081
3. 四川省地质调查院, 四川 成都 610081

基金项目: 国家重点研究发展计划项目（批准号：2017YFC1501005）、国家自然科学基金重点项目（批准号：41731287）和中国地质大调查项目（批准号：12120115045201）共同资助


详细信息

作者简介: 殷志强, 男, 38岁, 高级工程师, 滑坡调查及形成机理研究, E-mail:yinzq@mail.cigem.gov.cn

通讯作者: 孙东, E-mail:67986685@qq.com

中图分类号: P642.22

收稿日期:2018-04-25
修回日期:2018-07-05
刊出日期:2018-11-30

Study on spatial-temporal distribution characteristics and forming mechanism of landslides in the Meigu River basin

Yin Zhiqiang^1,,
Sun Dong^2,,,
Zhang Ying³,
Shao Hai¹,
Chen Liang³
1. China Institute of Geo-environment Monitoring, Beijing 100081
2. Chengdu Center of Hydrogeology and Engineering Geology, Sichuan Bureau of Geology & Mineral Resources, Chengdu 610081, Sichuan
3. Sichuan Geological Survey, Chengdu 610081, Sichuan


More Information

Corresponding author: Sun Dong,E-mail:67986685@qq.com

MSC: P642.22

--> Received Date: 25 April 2018
Revised Date: 05 July 2018
Publish Date: 30 November 2018


摘要
摘要:位于青藏高原隆升区的美姑河流域断裂褶皱发育，地貌类型特殊，滑坡分布广、规模大、危害重、成因机理复杂。为揭示向斜谷和背斜山这种特殊地貌控制下滑坡的时空规律和成生机制，文章在调查勘查和综合分析的基础上，系统研究了美姑河流域滑坡的时空展布特征，滑坡发育位置与活动断裂、褶皱、节理等响应关系以及滑坡的易发工程地质岩组，厘定了滑坡的主控因素，主要取得了以下认识：1）流域内滑坡在空间上"沿河流"、"沿断裂带"和"向斜核部"密集分布，时间上主要有5个发育期次：中更新世中晚期、晚更新世、200 a B.P.、19世纪80~90年代和现代；2）中晚更新世以来的断裂活动、褶皱作用、岩层节理面以及软弱夹层对滑坡发育具有独特的控制模式，断裂与褶皱是区内滑坡发生的主控因素；3）中生代的徐家河组（T₃xj）、沙溪庙组（J₂s）和东川组（T_1-2d）等砂泥岩互层岩组为滑坡最易发部位（易滑岩组），也是未来防范滑坡灾害的重点区。成果为高原及周边类似地区的滑坡研究和防灾减灾提供了新的技术理论支撑。
关键词: 美姑河流域/
滑坡/
时空发育特征/
成生机制

Abstract:The Meigu River basin, which is located in the uplift area of the Qinghai-Tibet Plateau, is characterized by the development of faults and folds. Due to special landform patterns, a large number of large scale landslides with complex genesis mechanisms that caused heavy damage. In order to reveal the temporal and spatial patterns and formation mechanisms of landslides controlled by this special landform with oblique valleys and anticlines mountains, on the basis of investigation and comprehensive analysis in the Meigu River basin and using the interdisciplinary ways of Quaternary geology, engineering geology and tectonic geology, the temporal and spatial distribution characteristics of landslides in the basin, the relationships between the development position of landslides and active faults, folds, joints etc., the main controlling factors of the engineering geological rock groups are susceptibility to landslide were all systematically studied, then have achieved the following conclusions: (1)The Meigu River basin belongs to the coincident tectonic landform under the control of tectonic uplift, with typical features of oblique valleys and anticline mountains. There were 18 faults and 27 folds with a certain scale in the basin by field investigations, and there is a good correlation between the occurrence time of landslide and the active period of fault. (2)There are 161 landslides in the basin which is the most important types of geohazards in the basin, and the development and distribution characteristics of landslides are significantly different due to the differences in topography and geomorphology of the upper, middle and lower reaches of basin. These landslides are spatially distributed "along the river", "along the fault zone", and "oblique core". And there are mainly five development stages:Middle-Late Pleistocene, Late Pleistocene, 200 a B.P., 1980s and 1990s and modern times. (3)Fracture activities, folds, joints, and soft interlayer in rock mass have unique control patterns over the landslides development process since the Middle-Late Pleistocene. Fault fractures and folds are the main controlling factors over landslides in the region. (4)Xujiahe Formation (T₃xj)、Shaximiao Formation (J₂s) and Dongchuan Formation (T_1-2d) of soft interlayer in sand-mudstone are the most prone sites for landslides (easy-slide rock mass groups), therefore, they are also the key areas for preventing landslide hazards in the future. All these results provide new technical theoretical support for landslide research and disaster prevention and mitigation in the similar regions of the plateau and surrounding areas.
Key words:Meigu River basin/
landslide/
temporal and spatial characteristics/
forming mechanism



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