甘肃舟曲泄流坡滑坡变形破坏机制研究

摘要

泄流坡滑坡是受断裂构造和地震作用共同控制的巨型深层岩质老滑坡. 泄流坡滑坡后期主要受降雨, 其次是地震作用的影响, 其变形破坏力学机制模式为蠕滑—拉裂; 由于该滑坡规模巨大, 对其进行了分区 (滑坡Ⅰ区—滑坡Ⅳ区), 并确定了各个分区的变形破坏机制: 滑坡Ⅰ区和滑坡Ⅳ区为蠕滑拉裂型推移式, 滑坡Ⅱ区为蠕滑拉裂型推移—牵引复合式, 滑坡Ⅲ区为蠕滑拉裂型牵引式. 在此基础上, 利用有限差分法对该滑坡变形破坏机制进行了数值模拟研究.%Sluice channel slide is an old deep rock slide controlled by both the faults fracturing and earthquakes .The lat-er stage of the sluice channel slide is affected mainly by rainfall ,then the earthquake ,the mechanism of deformation is creeping and ripping;Due to the massive dimensions of this landslide ,we divided it into four zones ( landslide zone I-landslide zone Ⅳ) ,and confirmed the deformation mechanisms of each zone;Landslide zone ⅠandⅣare creep-rip-e-lapse type,landslide zone Ⅱ is creep-rip-elapse-pull type,landslide zone Ⅲ is creep-rip-pull type.Based on all these machanisms ,we excecuted numerical modeling research on the landslide deformation mechanism using finite difference method.