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甘肃舟曲江顶崖古滑坡复活变形特征与稳定性分析

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为研究江顶崖古滑坡复活变形特征与稳定性,通过历史资料调研、现场踏勘与监测、卫星遥感和室内土工试验等方法,分析了主滑坡体、滑坡后壁及侧壁的变形特征与稳定性.结果表明:滑体前缘高陡边坡因降雨及河流冲刷导致坡脚失稳;中后部土体受地下水、连续强降雨影响,抗剪强度降低,下滑力增大,逐步向前推移;最终由于前缘土体的滑动,导致抗滑力减小,随之引发整体滑动,为缓慢滑动的牵引式滑坡.滑体后壁、两侧侧壁高陡,变形迹象明显,在强降雨或地震工况下易失稳滑动.江顶崖滑坡具有长期蠕滑变形、多次复活滑动等特点,是甘肃省近年来规模、范围最大的滑坡之一,在地震或暴雨作用下,滑坡有再次复活的可能,建议加强对滑坡区的变形监测,同时,对区域内不稳定斜坡进行加固治理,防止出现重大灾害.
Resurrection deformation characteristics and stability of Jiangdingya ancient landslide in Zhouqu,Gansu Province
In order to study the resurrection deformation characteristics and stability of Jiangdingya ancient landslide,the deformation characteristics and stability of the main body,rear wall and side wall of the landslide are analyzed by means of historical data investigation,field survey,monitoring,satellite remote sensing and indoor geotechnical test.The results show that the slope toe is unstable due to rainfall and river scouring;Under the influence of groundwater and continuous heavy rainfall,the shear strength of the middle and rear soil decreases,the sliding force increases and moves forward gradually;Finally,due to the sliding of the front soil,the anti sliding force decreases,resulting in overall sliding,which is a slow sliding traction landslide.The rear wall and side walls on both sides of the landslide are high and steep,with obvious signs of deformation,and are prone to instability and sliding under heavy rainfall or earthquake conditions.Jiangdingya landslide has the characteristics of long-term creep deformation and multiple resurrection sliding.It is one of the largest landslides in Gansu Province in recent years.Under the action of earthquake or rainstorm,the landslide may resurrect again.It is suggested to strengthen the deformation monitoring of the landslide area,and strengthen the treatment of unstable slopes in the area to prevent major disasters.

ancient landslidecreepresurrectiondeformation characteristicsstability analysis

杨校辉、朱鹏、窦晓东、袁中夏、张卫雄、丁保艳

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兰州理工大学土木工程学院,甘肃兰州 730050

甘肃省地质环境监测院,甘肃兰州 730050

甘肃地质灾害防治工程勘查设计院有限公司,甘肃兰州 730050

古滑坡 蠕滑 复活 变形特征 稳定性分析

甘肃省科技重大专项项目甘肃省青年科技基金计划甘肃省地质矿产勘查开发局创新基金项目甘肃省地质矿产勘查开发局创新基金项目

23ZDFA00720JR5RA4342020CX092023CX08

2024

地质通报
中国地质调查局

地质通报

CSTPCD北大核心
影响因子:1.226
ISSN:1671-2552
年,卷(期):2024.43(6)