Three-dimensional Strain Softening Slope Failure Mechanism And Stability Analysis Under Seismic Loads

Slope failure mechanism in the field of civil engineering is a very important research topic. Limit equilibrium method using the conventional slope Research, due to the complexity of the geological structure and storage conditions, not considering the slope it is actually a progressive failure. In this paper, in order to study the three-dimensional slope strain softening under seismic load failure mechanism and failure process, mainly to do the following work and obtain the corresponding achievements:(1)On the basis of previous studies, this paper presents a three-dimensional residual thrust method under seismic loads, using this method to analyze the three-dimensional slope stability under seismic loads and obtain the safety factor of the slope. Based on this study, research on the seismic parameters(amplification factor, horizontal seismic acceleration coefficient, horizontal seismic acceleration than vertical seismic acceleration) and geotechnical parameters(cohesion, internal friction angle) and slope of width to length ratio on the influence of the factor of safety.(2)Sliding soil physical and mechanical characteristics determine the slope failure modes and failure principle, strain softening sliding soil is the essential reason for the slope produce progressive failure. According strain softening model, this paper describes the passage of landslide deformation mechanism under seismic loads, damage types and control standards. Strain softening model based on slope progressive failure, but also because of the slope failure substance is strain softening, this paper proposed 3-stage failure mechanism: elastic stage, strain softening stage, residual strain stage. Through the study of stage 3 destruction reveals the nature of progressive deformation of slope failure.(3)Using MATLAB software programmes the relevant procedures. With this program were calculated safety factor of three-dimensional slope ideal elastoplastic model and three-strain softening model under earthquake, and further study of the seismic parameters and geotechnical parameters and slope of width to length ratio on the factor of safety.(4) Combined with the passage of 512 earthquake typical slope formula Specific examples, and the use of traditional imbalance thrust force method, under the three-dimensional seismic loads residual thrust method, ideal elastoplastic model and three-strain softening model calculated the safety factor, and contrast the results of each method to explore under seismic loads and three-dimensional residual thrust method is reasonable and realistic strain softening model approach. The deformation and stress of the slope in the software simulation of this paper, the use of sophisticated software FLAC3 D finite difference method simulation. Finally scene investigation, FLAC3 D simulation result and the method for comparison. The results show that: under seismic loads three-dimensional residual thrust method and Three-stage method of strain softening model perfect theory, rational calculation.