甘肃舟曲江顶崖古滑坡复活变形特征与稳定性分析
Resurrection deformation characteristics and stability of Jiangdingya ancient landslide in Zhouqu,Gansu Province
杨校辉 1朱鹏 1窦晓东 2袁中夏 1张卫雄 3丁保艳3
作者信息
- 1. 兰州理工大学土木工程学院,甘肃兰州 730050
- 2. 甘肃省地质环境监测院,甘肃兰州 730050
- 3. 甘肃地质灾害防治工程勘查设计院有限公司,甘肃兰州 730050
- 折叠
摘要
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.
Abstract
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.
关键词
古滑坡/蠕滑/复活/变形特征/稳定性分析Key words
ancient landslide/creep/resurrection/deformation characteristics/stability analysis引用本文复制引用
基金项目
甘肃省科技重大专项项目(23ZDFA007)
甘肃省青年科技基金计划(20JR5RA434)
甘肃省地质矿产勘查开发局创新基金项目(2020CX09)
甘肃省地质矿产勘查开发局创新基金项目(2023CX08)
出版年
2024
国家科技期刊平台
NSTL
万方数据