ORTHOGONAL SENSITIVITY ANALYSIS OF CASCADE SLOPE STABILITY UNDER RAINFALL AND EARTHQUAKE APPLIED IN GEOLOGY BASED ON THE PRINCIPLES OF ECOLOGICAL AND ENVIRONMENTAL PROTECTION

摘要

In view of the lack of quantitative sensitivity analysis for the stability of cascade slopes under rainfall-earthquake action, the quantitative sensitivity analysis of the stability of cascade slopes under rainfall-earthquake action is proposed principles of ecological and environmental protection. A typical slope in Luogang D istrict of Guangzhou is taken as an example. The internal factors (cohesion and in ternal friction angle) and external factors (rainfall intensity and seismic am plitude) which affect slope stability are selected as reference indexes. Taking the m inim um safety factor as the final evaluation index, based on the orthogonal test analysis, the quantitative sensitivity analysis is carried out, and the results show that (1) The orthogonal test analysis method can quickly obtain the influence of various physical and mechanical parameters of the slope on the deform ation and stability of the slope, w hich is consistent w ith the existing research results. (2) The influence of internal friction angle and rainfall intensity on slope stability is small, w hile cohesion c and seismic amplitude have great influence on slope stability. The order of the in flu ence of different parameters on slope stability is cohesion c > seismic amplitude > internal friction angle > rainfall intensity. (3) The results can guide the value of m aterial parameters in numerical simulation caused by the spatial variability of slope physical and mechanical parameters and the uncertainty of external load, and provide a good case for the stability analysis of slope under rainfall-earthquake action.