| With the community's awareness of the ever strengthening of environmental protection, clean energy, environmental protection growing demand for environmentally-friendly hydro-electric power as a clean source of energy have enjoyed great development, the various rivers have been conducted on water development steps. Long Kaikou hydropower dam site in Heqing County, Yunnan Province Rural Zhongjiang, It is the first six power stations of the middle reaches of the Jinsha river cascade hydropower stations 8, the proposed concrete gravity dam, the largest dam height 119m, The power station installed capacity of 1800MW. Exposed bedrock foundation in the region for the Sichuan-Yunnan region on the integration of Permian basalt (P2β), the left bank of the shore are mainly Permian basalt, on the right bank of the majority of Permian basalt, exposed some of syenite porphyry.In this paper,On the basis of understand the geological environment. The use of acoustic wave velocity than on the foundation of rock weathering zonation studies conducted.Rock mass structure controlled rock mass deformation and is a major factor in the destruction, through the survey found that the main developmental dam-classⅡ,Ⅲlevel,ⅣandⅤ-class four-level structure, the structure of the different characteristics of the evaluation works in this based on the structure of rock-long program began, the representative indicator of velocity, completeness factor and the quantitative value of the value of Lu; the impact of rock mass quality of the main factors are: lithology, unloading weathering, rock mass structure, RQD and rock strength in the application of single-factor, respectively, for rock mass quality classification based on the use of the single factor of the foundation of the relevance of an integrated rock and rock mass quality classification for the project a comprehensive classification of rock mass quality evaluation of programs, the use of classification of the dam foundation rock mass quality of the program were evaluated.At present, water and electricity most of the dam foundation rock mass quality of research concentrated in the pre-investigation stage, during the construction period for the excavation of the forecast verification study of feedback and testing small, with foundation excavation to expose the full picture of the bed rock, through on-site rapid testing, testing, research, analysis of dam foundation rock mass at different depths of the rock-level, the mechanical parameters of rock mass quality of the study do a good job and reasonable to deal with the forecast to determine the depth of excavation, scope; through excavation to expose the structure of surface, especially the weak low-angle side of the school determine the gravity of nuclear stability against sliding of dam foundation rock mass boundary conditions and mechanical parameters; precision measurements in a comprehensive foundation of rock mass structure on the basis of full access to the foundation of the mechanical parameters of rock. On that basis, a comprehensive verification Dragon Rock Station opening level and the quality of existing problems, improve and promote the foundation rock mass quality research techniques and the theory of gravity in the long opening of the foundation rock quality evaluation, to determine the stability of and economic significance is very remarkable. Dam infrastructure on the location of the base surface to optimize the adjustment in time, tracking the process of excavation, the use of rock mass quality evaluation program for classification of rock excavation foundation for rapid assessment of rock mass quality of the foundation to make ahead of forecast, the final use of the limited deformation of the foundation element and anti-slide stability analysis of numerical simulation, the application of rock mass quality evaluation and simulation analysis results of the excavation of foundation and make a reasonable analysis of the depth of foundation excavation to optimize the adjustment.
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