Factorial experiment of slope stability under slope-top loading and heavy rainfall

Abstract

Because the slope-top loading and heavy rainfall are both important factors inducing slope landslides and another geologic hazard. it is necessary to analyze factorial experiment of the slope stability under the slope-top loading and heavy rainfall. Taking a lope engineering of a municipal roads as an example, the stability of the slope was calculated based on the strength reduction method with FEM and Midas-GTS (SRM), and then the double-factor factorial experiment with repeated tests was used to analyze the stability of the slope. The stability results show that, when rainfall conditions remain unchanged, the slope-top loading is applied, and the safety coefficient is reduced by 16%∼21%. When the slope-top loading remains unchanged and the rainfall is strengthened, the security coefficient decreases by 10%∼19%.The analysis shows that the maximum shear strain of the slope is significantly affected by the slope- top loading and rainfall on the top of the slope. The effect of the slope-top loading on the maximum horizontal displacement of the slope is not significant. The effect of heavy rainfall on the maximum displacement of slope is very significant. The combined effect of slope-top loading and heavy rainfall on the maximum horizontal displacement of the slope is significant. Generally speaking, heavy rainfall is the main factor affecting the slope safety. Under the interaction of two factors, the slope stability is poor. In the future, attention should be paid to some local projects such as slope drainage in landslide control and prevention.