| XiLuoDu hydropower Station chose slightly weathering and new rocks as bedrocks on the two shoulders of the arch dam in the studying period of feasibility. But in the period of designing according to the principles of safety, reliability, thrift and rationalization, on the condition of being satisfied with the deforming of the arch dam and reliability, the surface of the project was optimized and the embedding depth of the two shoulders was cut by about 13m. The usable rocks of arch shoulders' notch are mainlyⅢ2 ones. If those rocks were used in the parts of low dam it would be a new and great breakthrough forγthe standard of usable rocks in the parts of high dam; and at the same time it also raised new attempt and practice for how to evaluate the geology of the project.In the essay I take XiLuoDu hydropower station's arch shoulders' notch as researching objects, through geological investigation on the scene I gained all-round information, launch many tests systematically and used many methods to study the overall characters of the notch's rocks. According to the law of the crack in the rocks which lessened gradually to a stable value from the surface to the inner part----rocks' structure being loose→crumbling→inlaid crumbling→,hypo-cubes→,cubes→whole cubes. With the law if it was singly handled part broken rocks by big structural breaking and weathering like a passageway, those changes' level has correspondence including weathering level' change, rock level' change, rocks' mechanic parameter' change on the effect of the weathering on the slop of rivers and valleys. So making use of last several relationship you can have many evaluation on the rocks: structure, weathering type of quality and mechanic parameter.
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