Abstract
Even though there exist lots of documents on Finite Element Strength Reduction Method, cohesion and internal friction angle in these materials are reduced through the same reduction factor, which fails to reflect either of their safe reserving quality or the quality to precisely match slope failure process and mechanism. As is known, the exterior angle circumcircle yield criterion DP1 of the generalized Mises would cause larger slope stability factor in slope stability analysis, whereas inscribed circle yield criterion DP4 of the generalized Mises has higher precision for the plane strain problem. Since the ANSYS has only DP1 criterion, considering the DP4 yielding criterion’s higher precision than DP1 in plane strain, the author first converts DP4 to DP1 that can be accepted by ANSYS, and then conducts separate reductions to cohesion and internal friction angle with different reduction proportionality factors according to double reduction factor method, and analyzes the calculation results afterwards. The results after analysis show that when cohesion and internal friction angle are reduced by reduction proportionality factor K=1.75, the failure characteristic of slope and attenuation specification of strength parameter match well to the real situation Therefore, reduction proportionality factor K =1.75 of cohesion and internal friction angle is typically recommended in homogeneous soil-slope.
Highlights
In traditional limit equilibrium [1], cohesion c and internal friction angle of geotechnical materials strength parameters were mainly reduced by the same safety factor in slope stability analysis
The cohesion and internal friction angle calculated by (7) and (8) were the one converted by DP4 criterion that could be directly applied to ANSYS program
For reducing the geotechnical materials the attenuation of homogeneous soil-slope was in progressive failure
Summary
In traditional limit equilibrium [1], cohesion c and internal friction angle of geotechnical materials strength parameters were mainly reduced by the same safety factor in slope stability analysis. 1874-1495/13 the double strength reduction is to make the double strength parameters’ change after reduction more corresponding with slope instability process and the actual strength characteristics This method can more accurately reflect each safety reserves of cohesion and internal friction angle of c and , making it of greater application value in practical engineering [4]. In the process of soil slope instability [10], the cohesion should first come into full play and with the increase of strain the friction resistance can begin to work. Based on the analysis above, in the analysis of double reduction factor, we should adopt the method in which cohesion reduction is greater than the internal friction angle
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
