四川茂县叠溪镇新磨村滑坡特征与成因机制初步研究

发布时间：2018-05-26 13:48

本文选题：边坡工程 + 新磨村滑坡　；参考：《岩石力学与工程学报》2017年11期

【摘要】：2017年6月24日6时许,四川省茂县叠溪镇新磨村新村组后山约450×104 m3的山体发生顺层高位滑动,导致10人死亡和73人失踪,引起国内外的广泛关注。在对灾害现场进行大量地质调查的基础上,综合运用卫星遥感、无人机航拍、地面合成孔径雷达监测等技术手段,初步揭示滑坡的运动过程和成因机制,并对滑坡周边直接受主滑坡动力作用而产生的欠稳定岩土体特征和危险性进行分析评价。初步结果认为,滑坡源区山体在1933年叠溪地震中被震裂产生拉张裂缝,之后在多次地震、长期重力以及降雨作用下,最终整体失稳破坏。滑坡从小规模垮塌到主滑体启动、失稳运动、到最终停积整个过程用时仅120 s,其中主滑坡仅60 s,运动距离约2.6 km,最大运动速度达74.6 m/s,属于典型高速远程滑坡碎屑流。新磨村滑坡具有高位、高度隐蔽性等突出特点,仅靠传统的调查排查和群测群防手段,已很难对灾害隐患进行早期识别和提前发现,必须尽快推广应用现代高精度对地观测技术(如In SAR,Li DAR,高清无人机航拍等),对我国西南山区类似隐蔽性高位崩滑灾害隐患进行排查和主动防范。
[Abstract]:At around 0600 hours on June 24, 2017, about 450 脳 104 m ~ 3 of Houshan of Xinmocun Hou Shan in Yanxi Town, Maoxi County, Sichuan Province, occurred a high sliding along the horizon, resulting in 10 deaths and 73 missing persons, which caused widespread concern at home and abroad. On the basis of a large number of geological surveys on the disaster site, and using satellite remote sensing, UAV aerial photography, ground synthetic aperture radar monitoring and other technical means, the paper preliminarily reveals the movement process and cause mechanism of the landslide. The characteristics and risk of the unstable rock and soil caused by the direct dynamic action of landslide are analyzed and evaluated. The preliminary results show that the mountain body in the source area of the landslide was cracked by earthquake during the Jiexi earthquake of 1933 and the tensile fracture was produced. After that, the overall instability was destroyed under the action of many earthquakes, long-term gravity and rainfall. It takes only 120 s for the landslide from small scale collapse to the start of the main slide body to start the main slide body, and then to the final stop process. The main landslide is only 60 s, the movement distance is about 2.6 km, and the maximum velocity is 74.6 m / s, which belongs to the typical high speed remote landslide with debris flow. Xinmocun landslide has the prominent characteristics of high position and high concealment, so it is difficult to identify and discover the hidden hazards in the early stage only by the traditional methods of investigation, investigation and group survey. It is necessary to popularize the application of modern high-precision earth observation techniques (such as in SARN Li DAR, high-definition UAV aerial photography and so on) to investigate and actively prevent the hidden high landslide hazards in the mountainous areas of southwest China.
【作者单位】：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;
【基金】：国家杰出青年科学基金资助项目(41225011) 国家创新研究群体科学基金资助项目(41521002)~~
【分类号】：P642.22

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