The Progressive Failure And The Stability Analyses Of Slopes

Landslide frequently occurs in China that greatly threatens people's life, property and economic construction. With the rapid development of our modern construction, more and more high-steep and deep slopes appear in many engineering fields such as hydroelectricity, mine, harbor, road, railway and energy, etc. Therefore, how to analyze and evaluate slope stability reliably and effectively is very significant to slope safety and landslide forecast in theory and practice. This paper reviews the development trend of various analytical methods and brings forward the research object and content.The progressive failure process is simulated, and stability of four landslides in Luoshan mine is mainly studied. The slope failure starts from part failure firstly, and then touches the extension one by one. Finally, great damage is caused. In this process, stress release, transfer and redistribution appear. The analysis shows that the results of slope progressive failure process method are consistent with slope actual situation.The stability of landslide bodies is studies by using a renormalization group approach. The critical failure probability values of the linear, two and three dimensional landslide bodies are 0.2063, 0.1707 and 0.1599 respectively, and the correlative length exponent values are 1.4388, 0.8084 and 0.5757 respectively. Then, a law is brought forward that critical probability and correlative length exponent values decrease with the increase in the dimensionality of a system. Four landslides in Luoshan mine were used to verify this model. The results show that this model can be used to predict the stability analysis for mine slopes, and the prediction accuracy is very high.Finally, based on the hypothesis that subjects are deformable bodies, mature numerical simulation method (FLAC^3D) in geotechnical engineering field is used, and its results are compared with those of Progressive Failure method. At first, typical cross-sections from mine slopes are selected. According to geological information the calculation model that is consistent with practical condition is established, and the analysis on deformation, safety factor and the position of potential sliding surface of the mine slopes at current situation is performed. It indicates that the progressive failure process can be simulated by FLAC^3D.