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A Preliminary Research on the Mechanism of Trench Landslide - Exemplified by Hejiacao Landslide in Zhen’an County of Shangluo

Through the detailed investigation of Hejiacao landslide in Zhen'an county, this paper analysed the developing features and forming factors of the trench landslides, Meanwhile, it preliminarily discusses the mechanism of deformation and failures for the trench landslide. The investigation shows that: 1The trench landslide is special in shape, mainly in pushing type with low angle, and has characters of slow creep speed and long time. It mainly takes place in populated regions with serious damage; 2The trench landslide is controlled by many factors, such as trench terrain, poor lithology, hydrologic condition and human activities; 3The trench landslide experiences three phases: Deposition-crack, pushing-creep and final destruction in the process of forming and movement.