| Tability analysis of the surrounding rocks of the underground cavities is the foundation of investigation, design, construction, safety and performance on hydropower engineering. This article based on the surrounding rocks being a structure mass of stabilizer, it applied multipurpose the method of engineering geological theory, block ultimate equlibrium theory, statistic analysis theory, the monitoring of deformation of displacement and feedback analysis etc, it analysed the characteristics of the surrounding rocks of cavities and the situation of unstable block mass. It fully analysed and evaluated the question of the stability of the surrounding rocks, with the effect of three dimensional model test and the design and construction of the shotcrete support etc, ensuring that safety and performance of hydropower plant. It can also add the system of databank about stability analysis and evaluation of the surrounding rocks of the underground cavities at karst district, and privide certainexperience and lessons for the construction of similar project.Three dimensional mathematical model considers the consequence of rock mass structurefield, rock mass stressfield and underwater seepagefield, it's outcome canprovide data foundation for the method of engineering measure, the monitoring of deformation of displacement and the effect of information feedback are important for the safety of construction, danger forecasting, adjustment of the parameter of design and support, stability analysis and selection of construction of methods and procedures. Reasonable workmanship can control the consequence of substrain of the surrounding rocks, and profit stability of the surrounding rocks. Karst and underwater weaken the perfection of rock mass, and have the factor of elasticity resistance decline, these lead to complex in situation of mechanics of the surrounding rocks, there are big different stability, and must been handled. |
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