|
|
|
| The Xinmocun landslide on June 24，2017 in Maoxian，Sichuan：characteristics and failure mechanism |
| XU Qiang，LI Weile，DONG Xiujun，XIAO Xianxuan，FAN Xuanmei，PEI Xiangjun |
| (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China) |
|
|
|
|
Abstract A large scale bedding landslide occurred in Xinmo village，Diexi town，Maoxian county，Sichuan at about 6∶00 pm on June 24，2017. The rock mass with the volume of 450×104 m3 destroyed the whole Xinmo village，resulted in the death of 10 people and missing of 73 people. This paper presents a comprehensive analysis on the dynamic process and failure mechanism of the landslide based on the site investigation，satellite remote-sensing(RS)，Unmanned Aerial Vehicle(UAV) photography，Ground Based Synthetic Aperture Radar (GBSAR) monitoring and other technologies. The preliminary study suggested that the rock masses of the source area were shattered and tension cracks were formed due to the shaking of the Diexi Earthquake in 1993. The shattered rock masses suffered from the subsequent strong earthquakes(such as 1976 Pingwu Earthquake and 2008 Wenchuan earthquake) and long-term effects of gravity and rainfall，which eventually resulted in the failure of the rock masses. The movement of the landslide lasted for 2 minutes in which the main landslide lasted for only 60 seconds with the runout of 2.6 km and the maximum speed of 74.6 m/s，a typical high speed and long runout landslide-debris flow. Because of the characteristics of high position and high concealment，this kind landslide is difficult to be detected with the traditional investigation methods. It is suggested that the high accuracy Earth Observation Technology(such as InSAR，LiDAR，UAV) should be promoted and applied to detect and prevent such high concealed landslides at high position in southwestern mountain areas.
|
|
|
|
|
|
[1] 唐荣昌，文德华，黄祖智，等. 松潘一龙门山地区主要活动断裂带[J]. 中国地震，1991，7(3)：64–71.(TANG Rongcang，WEN Dehua，HUANG Zuzhi，et al. The quaternary activity characteristics of several major active faults in the Songpan-Longmenshan Region[J]. Earthquake Research in China，1991，7(3)：64–71.(in Chinese))
[2] 王兰生，杨立铮，李天斌，等. 四川岷江叠溪地震滑坡(1933)[C]// 黄润秋，许 强，张倬元，等编. 中国典型灾难性滑坡. 北京：中国科学出版社，2009：57–93.(WANG Lansheng，YANG Lizhen，LI Tianbin，et al. Landslides triggered by the 1993 Diexi Earthquake，Sichuan[C]// HUANG Runqiu，XU Qiang，ZHANG Zhuoyuan，et al，ed. Catastrophic landslide in China. Beijing：Science Press，2009： 57–93.(in Chinese))
[3] 四川省蜀通岩土工程公司. 四川省茂县“6•24”地质灾害应急调查松坪沟区域地质灾害危险性评估报告[R]. 成都：四川省蜀通岩土工程公司，2017.(Sichuan Shutong Geotechnical Engineering Company. Emergency investigation assessment report of the “6•24”landslide in Songpinggou，Maoxian，Sichuan[R]. Chengdu：Sichuan Shutong Geotechnical Engineering Company，2017.(in Chinese))
[4] COMT(Center for Observation and Modelling earthquakes，valcanoes and Tectonic). Sentinel–1 satellites reveal pre-event movements and source areas of the Maoxian landslides，China[EB/OL]. http：// comet.nerc.ac.uk/sentinel–1-satellites-reveal-pre-event-movements- source-areas-maoxian-landslides-china/?platform=hootsuite. 2017– 06–29.
[5] TRE ALTAMIRA . Data in focus：precursor of Maoxian landslide measured from space[EB/OL]. http：// tre-altamira.com/news/data-focus- precursor-maoxian-landslide-measured-space/. 2017–06–29.
[6] 王同军，蒋 璀，陈 凯，等. 2009年6月5日重庆武隆鸡尾山滑坡地震波形分析[J]. 地震地磁观测与研究，2015，36(5)：8–14. (WANG Tongjun，JIANG Cui，CHEN Kai，et al. Understanding to the seismometer recording waveform of Jiwei mountain landslide on June 5，2009，Wulong，Chongqing[J]. Seismological Geomagnetic Observation and Research，2015，36(5)：8–14.(in Chinese))
[7] BRIDEAU M A，STURZENEGGER M，STEAD D，et al. Stability analysis of the 2007 Chehalis lake landslide based on long-range terrestrial photogrammetry and airborne LiDAR data[J]. Landslides，2012，9(1)：75–91.
[8] JABOYEDOFF M，OPPIKOFER T，ABELLA?N A，et al. Use of LIDAR in landslide investigations：a review[J]. Nature Hazards，2012，61：5–28.
[9] MONSERRAT O，MOYA J，LUZI G，et al. Non-interferometric GB-SAR measurement：application to the Vallcebre landslide(eastern Pyrenees，Spain)[J]. Nature Hazards Earth System Science，2013，13(7)：1 873–1 887.
[10] 赵 永. 6•24茂县滑坡过程分析[R]. 北京：中国地震台网中心，2017.(ZHAO Yong. Analysis of movement process of Maoxian landslide，Sichuan[R]. Beijing：China Earthquake Networks Center，2017.(in Chinese))
[11] 许 强，董秀军，邓茂林，等. 2010年7•27四川汉源二蛮山滑坡–碎屑流特征与成因机理研究[J]. 工程地质学报，2010，18(5)：609–618.(XU Qiang，DONG Xiujun，DENG Maolin，et al. The Ermanshan rock slide-debris flow of Junly 27，2010 in Hanyuan，Sichuan：Characteristics and failure mechanism[J]. Journal of Engineering Geology，2010，18(5)：609–618.(in Chinese))
[12] 许 强，黄润秋，殷跃平，等. 2009年6•5重庆武隆鸡尾山崩滑灾害基本特征与成因机理初步研究[J]. 工程地质学报，2009，17(4)：433–444.(XU Qiang，HUANG Runqiu，YIN Yueping，et al. The Jiweishan landslide of June 5，2009 in Wulong，Chongqing：Characteristics and failure mechanism[J]. Journal of Engineering Geology，2009，17(4)：433–444.(in Chinese))
[13] XU Q，FAN X M，HUANG R Q，et al. A catastrophic rockslide-debris flow in Wulong，Chongqing，China in 2009：Background，characterization，and causes[J]. Landslides，2010，7(1)：75–87.
[14] YIN Y P，CHENG Y L，LIANG J T，et al. Heavy- rainfall-induced catastrophic rockslide-debris flow at Sanxicun，Dujiangyan，after the Wenchuan Ms 8.0 earthquake[J]. Landslides，2016，13(1)：9–23.
|
|
|
|
2017, Vol. 36 
