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The unstability of the includes distortion and destruction. The main form of unstability includes loose, creep, falling, slip, toppling, buckling and tensile. For different terrain landform, geologic structure, lithology, rock mass structure, characteristic of structural plane of the high steep rock slop , the unstability form is different.The unstability of the high steep rock slop is a complex process and its model includes slip-tensile-shearing, stepped creeping-tensile, dumpage-distortion , high stress-strong discharge deep tensile. In addition, the above pattern may combines in the time or the space, constitution combination pattern.The influence factors of the high and steep rocky slope include two factors: the natural factor and the artificial factor. terrain landform, geologic structure, lithology, rock mass structure, characteristic of structural plane, crustal stress and water. The natural factor can be divided into three parts: terrain landform, geologic environment characteristics, atmosphere precipitation and groundwater; the artificial factor mainly means the influence of human engineering activities.On the basis of site investigation, This thesis takes the reinforced control project of Dr2 dangerous slop of Suofengying as models to study the stability of the high and steep rocky slope. The results indicate that the slope is in imminent unstable state. The original method to deal with this slop can simply summaried as "Wear hat on top", "belt the belt on waist", "puts on the shoe on foot". After analysis, some improvement measures to the original design scheme is put forward, which makes them more reasonable.
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