甘肃灵台县南店子滑坡活动特征及成因分析  

Characteristics and causes analysis of Nandianzi landslide in Lingtai County,Gansu Province

作　　者：唐家凯[1] 吴玮江[1] 刘韬 宿星[1] 万朝东 张国信[1] 安亚鹏 李祖刚 TANG Jiakai;WU Weijiang;LIU Tao;SU Xing;WAN Chaodong;ZHANG Guoxin;AN Yapeng;LI Zugang(Geological Hazards Prevention Institute,Gansu Academy of Sciences,Lanzhou,Gansu 730000,China;146th Team of Gansu Coalfield Geology Bureau,Pingliang,Gansu 744000,China;College of Water Resources and Hydropower,Gansu Agricultural University,Lanzhou,Gansu 730030,China)

机构地区：[1]甘肃省科学院地质自然灾害防治研究所,甘肃兰州730000 [2]甘肃煤田地质局一四六队,甘肃平凉744000 [3]甘肃省农业大学水利水电学院,甘肃兰州730030

出　　处：《中国地质灾害与防治学报》2023年第6期20-29,共10页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金项目(42067066);甘肃省科学院应用研究与开发项目(2022JK-04)。

摘　　要：2021年10月3日甘肃灵台南店子发生大型推移式黄土—泥岩接触面滑坡,因成功预警而未造成人员伤亡。为探明南店子滑坡发生机理,对滑体地形地貌、地层岩性、水文地质条件以及人类工程活动等进行了基础调查,根据滑坡裂缝发育特征和差异,将该滑坡体分为5个滑块,并对每个滑体特征进行深入研究,定性定量分析了不同滑坡部位的具体滑动情况,并为滑坡分级分块的客观合理性和滑坡机理分析进一步提供证据。最终分析得出滑坡灾害的发生主要是:(1)斜坡中下部和坡脚抗滑段不合理的大规模挖坡取土等人为活动使斜坡变陡、抗滑力减小;(2)坡面洼坑,导致排水不畅,长期大量入渗软化了岩层接触面,降低了斜坡的稳定性;(3)长时间的强降雨。研究成果对于相似区域监测预警、风险评价和工程治理工作具有很好的借鉴意义。On October 3,2021,a large landslide occurred at the loess-mudstone interface in Nandianzi,Lingtai,its successful early warning measures preventing casualties.In order to investigate the occurrence mechanism behind the Nandianzi landslide,a basic investigation was conducted,covering the topography,lithology,hydrogeological conditions,and human engineering activities related to the landslide.Based on the characteristics and differences of the crack development of the landslide,the landslide mass was divided into five blocks.The characteristics of each block were thoroughly analyzed through qualitative and quantitative analysis.The specific sliding situation of different parts of the landslide was analyzed,and further evidence was provided for the objective rationality of landslide classification and zoning,as well as the analysis of landslide mechanisms.Ultimately,it is concluded that the main causes of landslide disasters are as follows:(1)Large-scale excavation and earthwork activities at the lower and middle parts of the slope and the toe,leading to slope steepening and reduced resistance to sliding;(2)Formation of slope depressions,causing inadequate drainage and softening of the rock layer contact surface,thereby diminishing slope stability;and(3)Prolonged heavy rainfall that leads to instability and causes significant loss.While the Nandianzi landslide in Lintai county represents a successfully averted disaster,it serves as a noteworthy case study and a cautionary example for scientifically and standardizedly approaching urban construction and rural revitalization in China.This study holds significance value for monitoring,early warning,risk assessmen,and engineering treatment in comparable regions.

关 键 词：黄土滑坡 滑移特征 成因 成功避险 群测群防 

分 类 号：P642.22[天文地球—工程地质学]