Abstract: The time history analysis method of dynamic point safety factor is established based on safety margin, in light of the dynamic response of geosynthetics reinforced soil slope is very complicated, and existing methods are difficult to use for it. The nroposed method is used to evaluate the stability of geosynthetics reinforced soil slope, taking into account both horizontal and vertical seismic action. Based on the theoretical analysis, the dynamic point safety factors of the soil, geosynthetics and interface in the geosynthetics reinforced soil slope numerical model are defined. According to dynamic point safety factor method, through using a computational aids, the dynamic characteristics data is recorded, calculated and stored during computation process; and the dynamic point safety factor of the geosynthetics reinforced soil slope numerical model is figured out. The results show that the engineering applicability of method is well. The method reflects the relatively weak structure more clearly in the engineering, so as to provide reference in slope seismic design; vertical seismic action has greater influence on the stability of geosynthetics and interface, but smaller on soil.

Key words: geosynthetics reinforced soil slope, seismic stability, numerical analysis, dynamic point safety factor, time history analysis method