| The proposed Jilin Jingyu nuclear power plant is located in the tableland which on the left bank of the head way the Songhua river Baishan reservoir, in south of Gangdingcun, Chisongxiang, Jingyuxian, in the southeast of Jilin province.The draw up leveling elevation of the first phase of the preliminary main workshop area is about 528.30 m. Because of the slope in the research is directly related to the stability of the cooling tower in nuclear power project, and Baishan reservoir natural slope over the water level is reach to 100 meters, the tableland near the top of the slope present a steep cliff type, slope rock mass structure of the group were cutting by groups structural plane and its structure is complex, the stability degree of the natural slope has direct influence on the safely of the whole nuclear power project. So, the site of Jinli Jingyu nuclear power plant is took as class I slope engineering, and the study of the slope stability is very important.This article start from the structure characteristics of the fractured rock mass slope, in the foundation of detailed the geological data in research area, work on the failure mode-sliding surface of the slope, using dynamic stability analysis and stereographic projection analysis to search and determine the most dangerous sliding face of the fractured rock mass. And according to the reliability theory, through the Monte Carlo method and Latin hyper cubes method to establish the sample of the shear strength parameters, constructed the function, obtain model which can be used in the analysis of the reliability of the slope structure. Based on the above research results, he failure mode of searching and reliability calculation based on the fractured rock mass is put forward. The concrete content as follows:First, the paper discusses regional geological, hydrogeological and engineering geological conditions and environmental geological condition in the research area in details. The geological survey in June to September in 2007 introduced the Jingyu nuclear power plant project in summary, landform, rocks, geological structure, hydrology geology condition, physic-geologic phenomena, etc.Second, the paper analyses the main factors influencing slope stability and inducing factors, the rock mass structure characteristics and joints: 1)According to the survey of joints, the joints and fissures geometric shape, and joint planes characteristics, arid joints and fractures extensional status, fillings condition were studied. 2)For the stability of rock mass in the control effect of random structure surface, the paper based on the probability and statistics theories of random structure surface advantage method to partition series, divide random structure of rock face of advantage into groups. 4) According to the stability of the slope rock mass structure, analyze the overall characteristic of the slope rock mass structure.Third, this paper expounds the basic theory of reliability, mainly includes the basic concepts of the reliability of basic random variables, limit state equation, reliability, the reliability index etc. the reliability of the four kinds of common calculation methods are introduced such as a first order second moment method, , the response surface method, Monte Carlo (Monte Carlo) method Latin hyper cubes adopts in the paper detailed.Fourth, the paper in fractured rock's most dangerous sliding face search and determined. Using of dynamic stability analysis and stereographic projection analysis method to determine the fractured rock mass of the most dangerous sliding surface. Through to the slope steep cliff may appear on the surface of the adverse structure combination of single slide face and body wedge are analyzed, and gives corresponding sliding surface sliding direction and loose v Angle.Fifth, the dip angle of the most dangerous sliding surface is improved using Bayesian estimation method.Sixth, according to the combination level of rock mass structure set up the distribution parameters of structure surface shear strength; through the Monte Carlo method and Latin hypercube method establish the samples of the shear strength parameters. To contrast the convergence efficiency of the two methods, it studies the influence of shear strength parameters form in uniform distribution, normal distribution, the index distribution, logarithmic normal distribution, Gamma distribution, Beta distribution, triangle distribution on stability of the slope.Seventh, based on t he slope of the failure mode ( the potential sliding surface), performance function and limit state equation are constructed. Finally, the slope of the failure probability is calculated that through the Monte Carlo and Latin Hypercube method to get the slope structural reliability analysis model Verified by example, this method can effectively improve the reliability of the slope, the study of slope reliability has certain significance.Finally, the formation of rock slope history is simulated in the whole process mechanism, including the change of the valley slice different stages of the stress field (principal stress and the shear stress), displacement field deformation and yield unit. Through the finite element simulation analysis, understand the present stage of the stability of the slope.
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