Influence of reservoir water level rise and fall on stability of bridge bank slope
To study the influence of water level fluctuations on the stability of bridge bank slope,a bridge bank slope in the southwest region was selected as the research object.Based on the saturated-unsaturated seepage theory,the geostudio software system was used to analyze the variations of seepage field,displacement field,and stability of the bridge bank slope during water level fluctuations.The changing law of horizontal displacement of the bridge foundation was also discussed.The results show that during water level fluctuations,the seepage field of the slope exhibits a significant lag effect.Under initial impoundment and high water level conditions,the hor-izontal displacement of the slope monitoring points increases first and then decreases below the normal im-poundment level,and gradually increases above the normal impoundment level;under sudden water level drop conditions,the horizontal displacement of the slope monitoring points increases rapidly.Under initial impound-ment and sudden water level drop conditions,the horizontal displacement of the bridge foundation increases rapidly;under high water level conditions,the horizontal displacement of the bridge foundation continues to in-crease when above the infiltration line within the slope,and gradually decreases when below the infiltration line within the slope.Steeper bridge bank slopes exhibit larger horizontal displacements,requiring corresponding re-inforcement measures.The stability factor of the bridge bank slope rapidly decreases during sudden water level drops,and the stability of the bridge bank slope no longer meets the engineering requirements after a water lev-el drop of approximately 21.32 m.
bridge bank slopestabilityseepage fielddisplacement fieldbridge foundation displacement
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