Reactivation of Ancient Landslide Deposits: Geological Characteristics and Deformation Mechanism

Figure 8

Crack propagation and collapse characteristics of subslide zones I and II. (a) Soil collapse and wood forepoling damage in PD1704. (b) A tensional crack (Apr. 2009). (c) Shear sliding outlet with a local collapse failure in the front part of the landslide mass (Apr. 2009). (d) A tension-collapse belt at the rear edges of EL 2130–2150 m (Jan. 2009). (e) Instability model of gradual disintegration on the left side of the Zhenggang gully. (f) Instability zone of gradual disintegration on the left side of the Zhenggang gully. (g) Several groups of medium fractures in the front of zone II, with elevations of 2250–2400 m. ((h) and (i)) Failure of a concrete pier photographed on April 17, 2008, and January 15, 2009, respectively. (j) Tension-collapse belt at the rear part of EL 2650 m (Jan. 2009).