兰州市九州石峡口滑坡形成机制与稳定性分析

Forming Mechanism and Stability Analysis of Shixiakou Landslide at Jiuzhou,Lanzhou

基于滑坡区地质环境,通过区域地质调查、大比例尺平面图测绘、滑坡微地貌和变形破坏特征测量、扫描电镜(SEM)分析滑带土微观结构等手段,对兰州市九州石峡口滑坡的特征和形成机制进行了系统研究。结果表明,该滑坡具有显著的分级分块滑动特性,降雨、不合理的人工绿化灌溉及滑坡区高陡的地形是诱发该滑坡复活的主要因素。采用多种极限平衡计算方法并结合滑坡所处的地质环境评价该滑坡在天然、降雨、地震以及降雨和地震耦合作用下的稳定性,为该滑坡的治理提供理论指导。

Based on geological environment where landslide located, the characteristics and forming mechanism of the Shixiakou landside at Jiuzhou, Lanzhou, are researched systematically in terms of regional geological investigation, large scale topographical mapping, measurement of micro physiognomy and failure, geophysical survey, soil microtextures in the slipping zone analysis by Scanning Electron Microscope（SEM）. The results show that this landslide has the characteristics of remarkable classification and partitioning, the key elements of inducing the landslide to be revivable are rainfall, unreasonable false virescence irrigation and the high and steep topography in the landslide region. The stability of state is evaluated by different limit equilibrium methods, combining geological environment, on effects of natural state, or rainfall, or earthquake, or rainfall and earthquake. The resuh can take a theoretic guide rule in treatment of the landslide.