Abstract
There are a lot of discontinuous planes in rock mass of Longtan hydropower station underground power-house,so it is of practical value to make certain whether there are unstable blocks on excavation planes where faults and joints interlace with each other. Block theory is an effective and reliable engineering analysis method for the stability of faulted and jointed fractured rigid rock masses. This paper deals with the stability of Longtan hydropower station underground power-house with stereo-analytical method for block theory on the basis of detailed investigation of its rock mass data,and systematically calculates the numbers of possible moveable rock masses which are induced by all rock discontinuous plane and every excavation plane of cavern groups. The obvious statistical distribution result is obtained to offer basis on designing effective reinforcement option.
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