Analysis Of The Sensitivity Of The Rock Mass Parameters To The Stability Of Slope

With the rapid socio-economic development， the scale of constructions invarious fields increasingly expanded， and a number of engineering inevitablycontacted with the slope. As a result of more and more slope instability problems,especially, large-scale slope instability, it brought about so many casualties andproperty losses. It is necessary to analyze the slope stability in advance in order todetermine the measures taken to slope reinforcement processing. Sensitivity analysison slope stability influencing factors has a vital role to define the dominant factor fora better slope stability analysis.The slope stability analysis has two main methods， limit equilibrium methodand finite element method. Existing sensitivity analysis methods of slope stabilityfactor are summarized as fallows： analysis method based on nonlinear system， grayrelational analysis， improved Sarma method， analysis method based on orthogonaldesign， analysis method based on uniform design， analysis method based onartificial neural network， analysis method based on GIS and analysis method basedon finite element. These methods analyzed parameters of rock mass cohesion， angleof internal friction， deformation modulus， Poisson’s ratio， rainfall， seismic force.In the mean time， some scholars analyzed slope angle， slope height， combinationform of discontinuous surface， length of the discontinuous surface， the allowedvibration speed，the RQD value，groundwater conditions，slope shape，geologicalclassification index， the relationship between the original rock stress and the slopetoward. It provided a basis for selecting analysis method.It analyses the characteristics of the rock slope， slope type， the factors thataffect slope stability， type and mechanism of slope deformation and failure. Thispaper chooses cohesion force， internal friction angle， the gravitational density，deformation modulus and Poisson’s ratio. Taken Dongtai mountain for example， itsimplified the slope from a complex three-dimensional problem into atwo-dimensional plane strain problem， generalized and abstracted the slope rock mass for homogeneous continuous media， and chose Mohr-Column criteria as rockmass failure criterion.After establishing and meshing up the slope model in Phase~2， a finite elementsoftware， it analyzed the slope stability by changing a single rock mass parameter. Itillustrated the result with the slop critical shear strength reduction factor(CSRF) andcorresponding rock mass strength factor，and mean stress，volumetric strain， totaldisplacement on slope foot conditioned shear strength reduction factor(SRF)=1.4.Summarized the results of the analysis and got a conclusion that cohesion is mostsensitive to slope stability.