The Progressive Instability Determination Of The Bedding Slope With Multiple Layers Of Weak Interlayer And The Study Of Local Damage Extent

In recent years,along with our country to the west of the construction of a large number of railway and highway,bedding slope is inevitably emerged,especially the bedding slope containing multilayer soft interlayer,after excavation along different rock layers between the slope deformation of complex stress and strain state of weak interlayer,how with multilayer soft interlayer bedding slope stability evaluation and reinforcement will become the focus in slope engineering,however,the research achievements in this aspect is less.Therefore,this paper through theoretical analysis,numerical simulation,mathematical statistics and other research tools and methods of multilayer soft interlayer with progressive failure criterion and local failure scope were studied with multi layer slope,soft interlayer smooth progressive instability,whole body instability,the overall stability of the slope by discriminant method that includes layers of soft interlayer bedding slope local failure scope calculating method and procedure is proposed,the main research contents are as follows:(1)analysis of progressive failure characteristics of soft interlayer,established by FLAC3D with multiple weak interlayer bedding slope,excavation analysis.to the weak interlayer stress layer after exposed along the slopes and the deformation characteristics,so as to extract with multilayer soft interlayer bedding slope progressive failure mechanism(2)considering the strain softening characteristics of weak intercalated layer along the influence of slope stability,the upper bound theory of plastic limit analysis based on the deduced with multilayer soft interlayer along the overall stability,slope stability,whole loss determination method for progressive failure of the three cases.(3)the slope numerical model using the discrete element software UDEC established with multilayer soft interlayer,and use the fish function in UDEC was two times the development of software,the bedding slope failure process parameters of soft interlayer weakening,with multilayer soft interlayer layer along the progressive failure process of slope reconstruction,and CIS local failure slope displacement monitoring to determine the scope of the inflection point of soft interlayer.(4)based on the progressive failure mechanism of bedding slope with multilayer soft interlayer,the relationship between the parameters of the bedding slope and the local failure range is established.Based on the regression analysis of the values of the parameters and the range of local failure,the theoretical calculation formula of the local failure scope of the bedding slope with a single layer of soft interlayer is obtained.(5)with multilayer soft interlayer failure form of slope along with monolayer classification,weak interlayer bedding slope failure theory calculation formula based on local scope,the different forms of damage formulas are established and steps with multiple layers of soft interlayer bedding slope local failure scope.