Study On The Stability Of Landslide To Different Excavation Schemes

With the rapid development of economy and construction in China ,the problem that the stability of slopes of rock will be important in the construction of water conservancy and hydropower engineering in the future. Therefore , study on the problem that the stability of slopes of rock has being become significance not only in theory but also in engineering practice .Guishan sliding mass is located just above the intake(outlet) of the lower reservoir of the proposed Baoquan pumped storage reservoir, being 550-800m long from east to west ,260-350m wide from south to north, 110m thick in average and up to 210m thick, with a total volume of 21 million cubic meter. The stability of the landslide is a critical problem for feasibility of the project, and has a direct influence upon the operation of the lower reservoir and the power system. The sliding mass has been studied by some designer in geological investigation. The study showed that Guishan sliding mass is in stabilization under natural condition , is not in stabilization under VII earthquake intensity. Therefore, it is necessary to take order with the sliding mass so as to the safety of the project. The study contents of this paper is about the stability of landslide ofGuishan to different excavation schemes for meet with the needs of the project. This paper set up a geological model of sliding mass by geological condition analysis and selection cross section of character representation of Guishan sliding mass. The stability of sliding mass is calculated and evaluation under bench stoping and deck excavation in terms of six excavation schemes with limit equilibrium method. There dimensional finite element method is applied to study the stability of sliding mass to the deck excavation schemes by means of computer simulation and calculation .The study shows that the deck excavation schemes is good than the bench stoping schemes by calculation of limit equilibrium method and the sliding mass to the excavation the slide up to EL 790m is in stabilization under VII earthquake intensity with there dimensional finite element method by means of computer simulation and calculation ., the safety factor of the sliding mass is more than 1.20 and meet the needs of code for water conservancy and hydropower engineering.