Abstract:

The failure of dangerous rock is one of the geological disasters that occurs frequently in the Three Gorges Reservoir area. Based on the study  of geological background conditions and the factors inducing the failure of dangerous rocks, this paper explains the distribution and morphological characteristics of dangerous rocks in Fengcheng town, provides the classification of  the failure modes of the dangerous rocks in this area, and analyses the stabilities of six representative monomers of dangerous rocks qualitatively by stereographic projection method and quantitatively by limit equilibrium method. The results of the study show that all of the six dangerous rocks are instable or metastable, therefore, the control measures on them must be taken. The joint  controlling measures of smallscale earthwork, rockside support and anchorage, with surface drainage and closing fissures are put forward.

Key words:  Three Gorges Reservoir area; dangerous rock; failure mode; stability analysis; control measures