Safety-risk assessment and heavy rainfall stability of reconstructed and expanded highway slopes
This research aims to explore the safety risks associated with the expansion and reconstruction of highway slopes,and to quantify the impact of rainfall infiltration on different states of expanded high slope projects.A risk assessment system for highway slopes was established based on the AHP-AEW method.This system was applied to a Grade-7 slope project in Jikang Highway expansion.The fuzzy comprehensive evaluation shows the original slope was basically stable,which was downgraded to an unstable state after secondary excavation,but returned to an basically stable state with the reinforcement of frame anchors.The stability of the slope and its threshold horizontal displacements at different stages of reconstruction decreased with increasing rainfall intensity and duration.After the disturbance from secondary excavation,the slope in its unsupported state exhibited the highest risk of instability.The safety factors for the original slope,the unreinforced expanded slope,and the reinforced expanded slope were 1.093,0.637,and 1.313,respectively,showing decreases of 6.74%,27.34%,and 17.31%compared to pre-rainfall conditions.
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