工程地质学报2016，Vol.24Issue(4)：519-526,8.DOI:10.13544/j.cnki.jeg.2016.04.005
甘肃天水黄土梁峁区强震诱发滑坡特征研究
EARTHQUAKE-TRIGGERED LANDSLIDES IN TIANSHUI LOESS HILLY REGION,GANSU PROVINCE,CHINA
摘要
Abstract
Mega-earthquakes often occurred in loess hilly region of China.Earthquake-triggered landslides and other geological hazards can be the main reason for a large number of casualties and property losses.The 1 71 8 great Tongwei earthquake in northwest China caused more than 300 large-scaled landslides near the epicenter.The effects led to the movement of the northern mountains located in the meizoseismal area of Pan’an Town(the old Yongning Town),to the south,resulting in the total burial of Yongning town,with a historical record of over 30,000 deaths. Previous studies agree that the earthquake-induced landslides in the area are loess landslides,which slid along ancient terrain surfaces.Through detailed field investigations,the distribution features,the types of disasters and failure mode are studied.Taking the largest landslide - Weijiawan landslide as a case study and with the help of engineering geological drillings on the sliding mass,deep structure characteristics of the landslide are analyzed and the mechanics mechanism are discussed.The results indicate that the failure surface of the huge earthquake-induced landslide is located in the deep mudstone layer,which reveals that these landslides are loess-mudstone composite landslides.These new findings can help to further unravel the failure mechanisms of these earthquake-induced landslides that are recorded in several literatures.Meanwhile,the present results and conclusions can provide insights and knowledge on early recognition of earthquake-triggered landslides in northwest China towns,especially in the surrounding valley which shares similar geological conditions to the landslides studied in this paper.关键词
黄土梁峁区/地震/滑坡/失稳模式/力学机制Key words
Loess hilly region/Earthquake/Landslide/Failure mode/Mechanics mechanism分类
天文与地球科学引用本文复制引用
张帅,孙萍,邵铁全,石菊松,孟静,胡秋韵,王涛..甘肃天水黄土梁峁区强震诱发滑坡特征研究[J].工程地质学报,2016,24(4):519-526,8.基金项目
国家自然科学基金项目(批准号41472296,41372374),中国地质调查局“典型地震滑坡调查”(编号12120114035901)资助． （批准号41472296,41372374）
