| Based on the project of slope engineering for section K492+160~ K492+225 of double line from Zhuzhou to Liupanshui, this thesis introduces three type of failure form and some methods of reinforcement for consequent landslide in the country , especially in the west Hunan Prov. Some suggestions of prevention and treatment the disaster of consequent landslide was presented.The failure mechanism of soft rock slope and red stone consequent landslide were analysed. In the very project, the plans of gravity retaining wall, lock bolt support with shotcrete and soft-small-diameter-filling-pile were compared, the choice was the last one. Calculation for retainning wall and soft-small-diameter-filling-pile were carried out. Referring the theory of group-piles foundation and composite foundation, the ideal of pile-soil complex was developed. The stressed state, the mechanism, and the arrangement as well as construction method of pile-soil complex were analysed.The result of engineering practice since the finish of the project show that the soft-small-diameter-filling-pile has the advantage of flexible arrangement of pile position, construction easy and fast and low cost.; compared with traditional construction methods such as retainning wall and shotcret-bolt-support , the structure can be applied before excavation , so the stability of slope was ensured.
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