珍珠坝滑坡发育特征及稳定性评价

DEVELOPED CHARACTERISTICS AND STABILITY EVALUATION OF ZHENZHUBA LANDSLIDE ON JINSHA RIVER

通过对滑坡体结构特征调查及分析，阐述了滑坡的形成过程，表明滑坡主体的形成在Ⅲ级阶地形成之前，并属于顺层斜坡中的滑移～弯曲型滑坡。最后通过对滑带土的强度参数测试，分析了滑坡体的稳定性。

Zhenzhuba landslide is an old one, covering an area of 5. 32 Km2 , the total volume of its remains about 319. 2×106m3. The landslide occurred in Jurassic System Shaximiao Formation composed mainly of mudstone and sandstone. The strata dip out to the slope,with dip angle of 15°～ 17°. Through field investigation, its showed that Zhenzhuba landslide occurred early before the formation of third terrace and it was influenced by three running water erosion. Though the frontal margin of landslide ever partial revivals occurred, the main part of landslide's stability wasn't influenced. Calculation reveals that the stability factor of landslide is 1. 64 under normal condition, and 1. 262 on condition of reservoir level's elevation of 380 m above sea level. It's showed that the landslide is stable at present, and still stable before the reservoir level is elevated to 380 m above sea level and without action of other exogenic forces.