Reliability Analysis To Slope At ICE Water Accumulation Horizon In Tibet

Due to short-term rainfall and artificial excavation of the construction, the slope,which in the Qulong mining area, Maizhokunggar County, Tibet Autonomous Region, developed slope deformation and high escarpment on slope, threating the substation and region’s infrastructure below the slope. Based on the detailed investigation in the field, we analyzed the engineering geological conditions of slope stability and make partition of the slope, and further concluded that the formation conditions and mechanism of slope and deduce the evolution process of slope deformation.By using transfer coefficient method, we calculated the slope stability. Though MATLAB, constructing the modle-function of slope reliability and failure probability calculation, the calculation results is agreement about the transfer coefficient method. Through the method of numerical simulation, we analyzed the slope stability and the stress condition and displacement.On the basis of the study, we put forward measures and suggestions to combined with technology. Through the analysis of the typical examples, the stability of Tibet ice accumulation of soil slope and prevention engineering provide reference value and verify the use of MATLAB program to design reliability analysis of slope is reliable in calculation. The main research contents and results are as follows:1.According to the detailed survey and characteristics of deformation, the article introduce the engineering geological conditions of slope in maizhokunggar County.Based on the features of the slope, it concluded that the main factors of the deformation are concentrated heavy rainfall, favorable rock slope structure and artificial excavation. Analysis of the deformation and characteristics of slope,we got a failure model:the leading edge cut out-central peristalsis-the edge cracking.2.Combined geological characteristics, we use transfer coefficient method of quantitative stability calculation. The results show that under the condition of rainstorm,the stability coefficient is close to the critical value of 1.000 and need treatment.3.Based on the matlab program, we designed the Monte Carlo simulation analysis of unstable slope reliability and stability evaluation in matlab software.Using MATLAB software to complete statistical analysis of factors of rock and soil, and choose the influence factors of probability distribution.Using MATLAB program calculate the reliability index and failure probability of slope. The results show that the 1-1 section is of moderate risk, and the rear part of the 2-2 and the 4-4 is in a moderate risk level.4.Use ANSYS and FLAC-3D to generate finite difference calculation grid,which can calculate the stress state and displacement of the slope under natural and heavy rain conditions. The results show that the displacement of the slope under natural conditions is very small, which indicate a stable slope.And the stability of the slope under heavy rain conditions is relatively low.5. The treated project of the slope should combined with all of the concequences above,which to make the treatment engineering more efficient.