Base On Modified Sarma Method Using In Slope Stability Analysis

Rock slope is a common type of slope in open pit mining.Aiming at the problem of rock slope stability encountered in the process of open pit mining,combined with the example of slope stability in Ninghua Xingluokeng open pit tungsten mining,the stability characteristics of rock slope joints or faults are revealed.Based on the improved Sarma method,the numerical model of the paper realizes the numerical analysis of the stability of the layered slope and the stability of the rock slope with three dimensions(including joints and faults)respectively,and opens up a new research way for the stability of the stratified slope and the three-dimensional rock slope.This is the creative achievement of this article.The rock slope of open-pit mining is composed of joints and faults with multi sets of different occurrence of different lithology of rock mass,the relationship between the Sarma method and calculation method of comprehensive advantages and characteristics of the rock slope,by means of measurement of jointed rock slopes and judge the fault occurrence,lithology,numerical model right,study the relationship between the factors of the stability of rock slope and excavation height and slope angle of the open pit mine.The main contents are as follows:(1)The improved Sarma method is used to analyze the slope stability of the slope,and the error is less than that of other methods.(2)The collection of Ninghua Xingluokeng tungsten mine open-pit mining area geological exploration and technical data of the original,summarize and analysis of mining area of jointed rock slopes and fault occurrences of comprehensive measurement and statistics,made into a new and more comprehensive geological data,rock lithology of the mining area were analyzed.And direct shear experiment,the rock mechanics parameters of rock mass acquisition.The rock mass classification is estimated by referring to the corresponding codes.(3)The three-dimensional Sarma method is improved on the mining area has been part of the excavation stability analysis of excavation,not part of the stability prediction,the results show that: in the current state,the slope is relatively stable,when the slope to a certain extent will be unstable,at this time should be considered on the gentle slope angle.(4)The prediction of consequent slope may occur.The results show that when the slope is bedding slope,the rock slope is easy to lose stability,and the reverse slope is not easy to lose stability.Finally,the calculation shows that the model has a certain reference significance.