摘要
受连续强降雨影响,2022年8月金平某矿山斜坡道硐口上方斜坡发生突发性滑坡,造成斜坡中部道路损坏,掩埋斜坡道硐口。通过灾后地面调查、地质测量、无人机正射投影、钻探和浅井等方法对滑坡进行了现场地质勘查,查明了本次滑坡的成因机制及变形特征。灾害成因:原始斜坡具备滑坡形成的地形条件,滑坡形成的主因是工程切坡,其它因素有地质条件、地震和降雨等,激发因素是降雨。滑坡的变形过程为:斜坡中部道路切坡,形成高陡临空面→地表水冲刷及长期入渗浸润降低坡体强度并增加坡体重量,滑坡后部产生向前的蠕动变形,坡体逐步牵引致使后缘拉裂→地表水长期入渗潜蚀软化软弱层,后缘优势结构面受水力影响,产生“水垫效应”形成推移驱动平台,上部坡体在自重作用下产生滑动→滑体冲击、刮铲道路及下部斜坡,掩埋斜坡道硐口,据此分析,滑坡形成机制为牵引-推移式变形。通过室内试验结合滑面反算确定滑带土物理力学指标,基于传递系数法对滑坡进行了稳定性计算,结果表明,该滑坡仍有失稳风险,需要进一步加固处理。
Affected by continuous heavy rainfall,a sudden landslide occurred on the slope above the slope tunnel entrance of a mine in Jinping in August 2022,causing damage to the road in the middle of the slope and burying the slope tunnel entrance.Through post-disaster ground survey,geological survey,orthopo projection,drilling and shallow wells on the landslide geological exploration,find out the cause mechanism of the landslide and the deformation characteristics,causes of disasters:the original slope with landslide formation conditions,the landslide is engineering cutting slope,other factors have geological conditions,earthquake and rainfall,etc.,excitation factors is rainfall.Landslide deformation process:the central slope road cutting slope,forming high steep air surface surface water erosion and long-term infiltration reduce slope body strength and increase the slope weight of landslide backward forward peristalsis deformation,slope body gradually traction causes the surface water long-term infiltration soften soft layer,rear edge advantage structure is affected by hydraulic,produce“water cushion effect”formation push drive platform,under the weight of upper slope sliding body impact,scraper road and lower slope,buried slope adit,according to the analysis,landslide formation mechanism for traction~pass-type deformation.The physical and mechanical indexes of sliding belt soil were determined by indoor test and reverse calculation of sliding surface,and the stability of the landslide was calculated based on the transfer coefficient method.The results show that the landslide still has the risk of instability and needs further reinforcement and treatment.
作者
严优
刘润中
张超
郑吉云
刘珍
YAN You;LIU Run-zhong;ZHANG Chao;ZHENG Ji-yun;LIU Zhen(Yunnan Geological Engineering Second Survey Institute Co.,LTD.,Kunming 650218,China)
出处
《地质灾害与环境保护》
2024年第1期14-18,共5页
Journal of Geological Hazards and Environment Preservation
关键词
复合式滑坡
强降雨
人类工程活动
成因机制
稳定性分析
compound landslide
heavy rainfall
human engineering activities
genetic mechanism
stability analysis
