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川西松潘上窑沟古滑坡复活特征及危险性预测研究

吴瑞安, 张永双, 郭长宝, 杨志华, 任三绍, 陈鹏

吴瑞安, 张永双, 郭长宝, 杨志华, 任三绍, 陈鹏. 川西松潘上窑沟古滑坡复活特征及危险性预测研究[J]. 岩土工程学报, 2018, 40(9): 1659-1667. DOI: 10.11779/CJGE201809012
引用本文: 吴瑞安, 张永双, 郭长宝, 杨志华, 任三绍, 陈鹏. 川西松潘上窑沟古滑坡复活特征及危险性预测研究[J]. 岩土工程学报, 2018, 40(9): 1659-1667. DOI: 10.11779/CJGE201809012
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WU Rui-an, ZHANG Yong-shuang, GUO Chang-bao, YANG Zhi-hua, REN San-shao, CHEN Peng. Reactivation characteristics and hazard prediction of Shangyaogou ancient landslide in Songpan County of Sichuan Province[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(9): 1659-1667. DOI: 10.11779/CJGE201809012
Citation: WU Rui-an, ZHANG Yong-shuang, GUO Chang-bao, YANG Zhi-hua, REN San-shao, CHEN Peng. Reactivation characteristics and hazard prediction of Shangyaogou ancient landslide in Songpan County of Sichuan Province[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(9): 1659-1667. DOI: 10.11779/CJGE201809012
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川西松潘上窑沟古滑坡复活特征及危险性预测研究  English Version

  • 1. 中国地质科学院地质力学研究所,北京 100081;
    2. 中国地质调查局天津地质调查中心,天津 300170;
    3. 四川省阿坝州松潘县国土局,四川 阿坝 624000

基金项目: 国家自然科学基金重点项目（41731287）; 中国地质调查局项目（DD20160271）
详细信息
    作者简介:

    吴瑞安(1991- ),男,博士研究生,主要从事工程地质与地质灾害方面的研究工作。E-mail：wuruian1991@126.com。

    通讯作者:

    张永双，E-mail：zhys100@sohu.com

  • 中图分类号: TU457

Reactivation characteristics and hazard prediction of Shangyaogou ancient landslide in Songpan County of Sichuan Province

  • 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
    2. Tianjin Center, China Geological Survey, Tianjin 300170, China;
    3. Songpan Land and Resources Bureau, A'ba 624000, China

摘要

    摘要
  • 摘要: 随着近年来人类活动加剧和极端天气的频繁出现,古滑坡复活问题日益突出,严重威胁着工程设施和城镇安全。以青藏高原东缘松潘县上窑沟古滑坡为例,在剖析古滑坡复活特征的基础上,分析了不同重现期降雨条件下滑坡的破坏范围和失稳概率,并采用DAN3D软件模拟研究了滑坡运动过程和堆积范围,开展了古滑坡复活的危险性预测评价。结果表明：①受坡脚浸润侵蚀和强降雨的影响,上窑沟古滑坡前缘局部H1已经复活,呈现出多级序、多期次活动的特点,目前地表宏观变形迹象清晰,存在进一步失稳可能;②H1在20 a一遇的10 d连阴雨条件下处于不稳定状态,失稳概率达99.12%,而后部的H2在100 a一遇10 d连阴雨条件下处于不稳定状态,失稳概率达96.36%,可能和前部H1发生连续失稳下滑;③仅前缘局部H1失稳时,滑体最远运移距离约350 m,堆积体前缘不会抵达居民区;④当后部H2和前部H1连续失稳时,滑体最远运移距离达550 m,沟口居民区的排导槽首端至国道G213间半径约150 m的扇形区遭受滑坡-碎屑流的危险性大。
    Abstract: Affected by the intensifying human activities and frequent occurrence of extreme climate in recent years, the problem of ancient landslide reactivation is increasingly prominent, threatening the local engineering facilities and urban security. Based on the Shangyaogou ancient landslide in the east margin of the Tibetan Plateau, the reactivation characteristics are analyzed, and the instability probability of the landslide under different rainfall conditions for return period is calculated. In addition, DAN3D software is used to simulate the movement process and accumulation scope of the sliding mass, and assess the landslide hazard. The results show that: (1) A local part H1 has been reactivated in the front of the ancient landslide due to heavy rainfall and foot erosion, presenting the activity characteristics of multi-stage and multi-period. At present, the deformations on the slope are obvious, and have a potential for further instability. (2) H1 is in an unstable state under the condition of 20 years of continuous rainfall in 10 days with the instability probability of 99.12%. The posterior part H2 is highly likely to follow H1 and move downslope under the condition of 100 years of continuous rainfall in 10 days with the instability probability of 96.36%. (3) The farthest movement distance is about 350 m when only the reactivated part H1 moves, and the forefront of the landslide deposits will not reach the residential areas. (4) When the posterior part H2 moves following the reactivated part H1, the farthest movement distance is about 550 m. For the residential areas, the fan area from the head of the drainage channel to the national road G213 with a radius of about 150 m is considered to have a high hazard risk of landslide-debris flow.
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