Study On Evaluation Method Of Carbonaceous Shale Slope Stability

Carbonaceous shale contain a large number of dispersed carbonized organic.It is widely distributed in the southwestern region such as Guangxi,Guizhou and other places.As the impact of carbonaceous shale’s physicochemical properties and engineering properties,the cutting slopes which contain carbonaceous shale are most susceptible to occur instability failure such as collapse and landslide.With the continuous improvement of the national road network,more and more new roads have to cross the carbonaceous shale zone.So,if we can summarize the achievements of previous studies,in addition to a large number of experimental and numerical analysis,to get the representative physical and mechanical parameters of carbonaceous shale,and based on this,put forward the fast evaluation method for carbonaceous shale slope’s stability at last.This research has important theory research signification and utility value.This paper firstly analysed the carbonaceous shale slope’s stability classification and it’s deformation failure mechanism and characteristics.Then summarized the advantages and disadvantages of the most existing methods for slope’s stability analysis.Ultimately,this paper selected the composite method of numerical simulation and non-deterministic analysis to carry out research.After a lot of indoor soil tests and study on engineering properties,this paper got the carbonaceous shale’s physics and mechanics parameters which are necessary to the numerical simulation analysis.On this basis,selected representative factors for slope stability,such as slope height,slope angle,the cohesion,internal friction angle,density and the obliquity of rock.According to the orthogonal experiments design method,used the ANSYS12.0 to established 25 slope models of different combinations by various factor levels.Then imported the complete models to the FLAC3D,to calculated the slope’s safety factor and displacement.The paper sorted the various factors’s sensitivity by the result data get from ANSYS and FLAC3D.And based on these data,this paper continue to studied the non-deterministic system:artificial neural network system.This is a more convenient method to the carbonaceous shale slope’s stability evaluation.The paper established the BP neural network system by using MATLAB,and used the result data which calculated by FLAC3D as the BP neural network’s sample data to learning and training.The verification results show that,this neural network has the reliable prediction accuracy,it can be used as a fast evaluation tool for the same type carbonaceous shale slope’s stability.