TYPES,FORMATION CONDITIONS AND PRE-DECISION METHOD FOR LARGE LANDSLIDES WITH POTENTIAL LOCKED PATCHES

Recent research demonstrates that sliding is the most common instability mechanism type of large-scale catastrophic landslides. Usually sliding associates with stress concentration and brittle failure in locked patch(stress concentration and key load-bearing region). It's the strength and deformation of the locked patch determine the overall stability of the slope which are defined as locked patch landslides by author. Cases of 36 large-scale catastrophic landslides are analyzed in this paper. The types and formation conditions of the locked patch landslides are classified, generalized and summarized. Moreover, a pre-decision method is proposed. The research has the premise of disaster prevention and mitigation for locked patch landslides, and has good scientific significance and guiding value in disaster prevention and mitigation.