兰州市皋兰山铁三小滑坡形成条件及其稳定性分析

Analysis of the features and stability of Tiesanxiao landslide under Gaolan Mountain,Lanzhou

陡峭的地形条件、软弱的岩土体组合、新构造运动条件是滑坡形成的基本条件,地震及极端季候条件是导致滑坡发生的直接诱发因素,而人类不合理的开挖、人工绿化灌溉、地震及持续降水则是今后滑坡体局部复活的重要因素.利用传递系数法,对滑坡体的稳定性进行验算,发现铁三小Ⅰ,Ⅱ,Ⅱ_1,Ⅲ号滑坡体在自然状态下均处于稳定—基本稳定状态,在地震及暴雨状态下处于基本稳定欠稳定状态.

A steep topography,soft soil and rock structure and neotectonic conditions will trigger a landslide,earthquake or extreme climate.Human excavation,artificial afforestation,and continuous rainfall would be the important factors for their recurrence.Here the stability results of the Tiesanxiao landslide were presented by the transfer coefficient method,showing that the Ⅰ,Ⅱ,Ⅱ_1 and Ⅲ landslides thereof are in a stable state under the natural condition,but will become unstable when an earthquake or rainstorm occurs.