摘要
以甘肃天水地区渭河北岸大型黄土-泥岩滑坡为研究对象,通过野外地质调查、工程地质钻探、室内力学试验以及FLAC3D数值计算的方法,对该类滑坡的发育特征及地震作用下的稳定性进行分析评价。结果表明:该类滑坡多属于历史地震滑坡,其破坏类型为滑移拉裂型。通过对滑坡的稳定性进行计算分析可知,静力作用下滑坡处于稳定状态;地震作用下,稳定性明显降低,坡体可能再次滑动,预测滑面位于黄土-泥岩接触带位置,与野外调查观测结果一致。研究结果对天水地区该类滑坡的早期识别有重要参考意义,可为该类滑坡的防灾减灾提供科学依据。
Taking the large loess-mudstone interface landslide in Tianshui area,Gansu Province as a case study,the characteristics of earthquake-triggered landslide development and stability were analyzed and evaluated based on field geological survey,engineering geological drilling,lab-based mechanical tests and FLAC3D numerical calculation.The results show that most of these landslides are historical earthquake-triggered landslides,and their failure types are mainly slip-pull.Through calculating and analyzing the stability of these landslides,it is suggested that the slopes are currently stable.Under the influence of earthquakes,the slope stability would be markedly reduced,and the slope may have a secondary slip.The predicted slip surface is located at the loess-mudstone interface,consistent with the field survey results.Our finding is important in early-stage landslide recognition and provides scientific basis for landslide-related disaster prevention in Tianshui area.
作者
孙萍
祝恩珍
张帅
韩帅
王刚
SUN Ping;ZHU Enzhen;ZHANG Shuai;HAN Shuai;WANG Gang(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China;Key Laboratory of Neotectonic Movement and Geohazard,Ministry of Land and Resources,Beijing 100081,China;China University of Geosciences,Beijing 100083,China;Department of Earth Science,Shimane University,Matsue,Shimane 690-8504,Japan)
出处
《现代地质》
CAS
CSCD
北大核心
2019年第1期218-226,共9页
Geoscience
基金
国家自然科学基金项目(41472296)
中国地质调查局地质调查项目(DD20160271)
关键词
黄土-泥岩接触面滑坡
发育特征
稳定性
滑坡机理
loess-mudstone landslide
development characteristic
stability
landslide mechanism
