Pseudo-static analysis of slope stability by finite element stress deviator increasing method-design charts under yield coefficients
摘要
Among the various techniques available for evaluating slope performance in earthquake-prone regions, the pseudo-static approach remains the predominant method for seismic slope stability analysis. In this study, a recently developed finite element method known as the Stress Deviator Increasing Method (SDIM), combined with seismic pseudo-static analysis is employed, to assess the stability of homogeneous slopes and generate stability charts. This innovative approach evaluates slope stability by progressively increasing the mobilized principal stress deviator in a controlled manner, which involves a parameter regulating the expansion of principal stress Mohr’s circles. The SDIM process iterates until soil failure is reached. Initially, a concise description of the SDIM is provided and the Fortran code interpreting the relevant computational calculations is extended to include pseudo-static loading (S4DINA 3.0). Subsequently, S4DINA 3.0 is employed to graphically establish Limit State Lines (LSL) known as g-lines for various slope angles and a range of horizontal seismic coefficients. A chart example is presented to elucidate the significance of a g-line and show how a Factor of Safety (FOS) can be graphically derived for any combination of (