1.甘肃地质灾害防治工程勘查设计院有限公司,甘肃 兰州730050
2.甘肃省地矿局第三地质矿产勘查院,甘肃 兰州730050
张卫雄(1971—),男,正高级工程师。主要从事矿产资源开发与地质灾害防治等工作。E-mail: 1653015716@qq.com
丁保艳(1984—),男,高级工程师。主要从事地质灾害防治相关方面的工作。E-mail: 378044265@qq.com
收稿:2020-11-02,
修回:2021-02-05,
纸质出版:2022-08-28
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张卫雄,丁保艳,张文纶等.舟曲江顶崖大型滑坡成因及破坏机制分析[J].防灾减灾工程学报,2022,42(04):714-722.
ZHANG Weixiong,DING Baoyan,ZHANG Wenlun,et al.Analysis on the Cause and Failure Mechanism of the Jiangdingya Large Landslide in Zhouqu, Gansu Province[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):714-722.
张卫雄,丁保艳,张文纶等.舟曲江顶崖大型滑坡成因及破坏机制分析[J].防灾减灾工程学报,2022,42(04):714-722. DOI: 10.13409/j.cnki.jdpme.20201102001.
ZHANG Weixiong,DING Baoyan,ZHANG Wenlun,et al.Analysis on the Cause and Failure Mechanism of the Jiangdingya Large Landslide in Zhouqu, Gansu Province[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(04):714-722. DOI: 10.13409/j.cnki.jdpme.20201102001.
受连续强降雨及江水冲刷坡脚的影响,2018年7月12日舟曲县江顶崖发生大型滑坡。为研究该滑坡的成因及其破坏机制,首先采用现场踏勘、遥感解译和无人机航拍等方法初步确定滑坡范围及岩土体分布特征等因素,其次结合钻探、物探、室内试验等研究手段查明滑体土和滑带土的物理力学性质,对该滑坡的失稳特征及其复活机制进行探讨,在此基础上对该滑坡进行稳定性评价。结果表明:(1)江顶崖大型滑坡为南峪滑坡群中江顶崖老滑坡的复活体,总体积近400万方,属大型滑坡灾害,该滑坡分为主滑坡堆积区、滑坡侧壁区和滑坡后壁区;(2)不利的地形地貌条件、软弱岩土体组合、强烈的构造运动、降雨的入渗和江水冲刷是滑坡形成的主要因素,其中连续强降雨是决定性因素;(3)江顶崖大型滑坡同时具有推移式和牵引式滑坡的特点,滑坡中后部以推移式变形为主,坡体临江前缘以牵引式滑塌为主;(4)稳定性计算结果表明该滑坡仍有失稳风险,需要进行加固治理。本文研究成果可为青藏高原东北缘类似大型滑坡的成因机制研究及其预警防治等提供参考。
Due to the continuous heavy rainfall in the rainy season and the erosion of the slope toe by the river flow, a large landslide occurred at Jiangdingya in Zhouqu County on July 12, 2018. Firstly, the landslide dimension and the distribution characteristics of rock and soil mass were preliminarily determined by means of field survey, remote sensing interpretation and UAV aerial photography. Then, the physical and mechanical properties of the landslide deposit and soil in the shear band were obtained by means of drilling, geophysical exploration, and indoor and outdoor tests. Finally, the sliding characteristics and reactivation mechanism of the landslide were discussed, and the stability of the landslide was evaluated. The results show that:(1)As the reactivation body of the Jiangdingya old landslide in the Nanyu landslide group, the present Jiangdingya landslide is a large-scale geological disaster with a total volume of nearly 400 × 104 m
3
. The landslide is divided into the main deposit area, lateral sides area and the main scarp area;(2)The main factors for the formation of landslides are unfavorable topographical and geomorphic conditions, weak rock and soil mass composition, strong structural movement, rainfall infiltration and river erosion, among which the continuous heavy rainfall is the decisive factor;(3)Jiangdingya large-scale landslide has the characteristics of both advancement and retrogression, with an advancing sliding in the upper part of the landslide, and a retrogressive movement at the slope toe near the river; (4)The stability calculation results show that the landslide still has the risk of instability, so proper reinforcement measures are necessary. The research results can provide references for the formation mechanism recognition of similar large-scale landslides in the eastern margin of the Qinghai Tibet Plateau and the early warning and control measures design.
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