关键词: 岩土工程, 危岩, 形成机制, 治理

Abstract: Perilous rock is a kind of common geological disaster with great harm，which is widely distributed in the Three Gorges Reservoir area.The basic features， the damage ways and the formation mechanism of typical perilous rock were studied.It was pointed out that there were three damage types，including falling type， sliding type and dumping type；and the chain reaction had influence on the damage modes of perilous rock.There was a great difference on the strength and weathering resistance between sandstone and mudstone (shale).The mudstone (shale) was easy to become a weak base because of its low strength，its easiness to be softened and weathered.Therefore，the mudstone (shale) became concave rock cavity because it was shattered and loosened；and the upper sandstone became perilous rock.The research shows that based on the correct analysis on the formation mechanism of perilous rock，the “artificial removing + point anchoring + suspended spray anchor + active protective net” technology is adopted to control the perilous rock in such areas，and the effect is obvious.

Key words: geotechnical engineering, perilous rock, formation mechanism, governance