Corrosion Risk Analysis of Anchoring Bolts in Groundwater of Shiziyang Area
The anchoring system in an anchorage is a critical foundation for the safety of long-span cable-stayed bridges,and the corrosion of anchoring bolts in groundwater and under tensile loads directly im-pacts the structural safety and durability of the bridge.Focusing on the Shiziyang Bridge anchorage within the Pearl River basin,where the anchoring structure is affected by groundwater now,this study combines in-situ surveys with laboratory tests to analyze the corrosion risk levels of steel structures under different geological conditions by investigating corrosive agents in the longitudinal groundwater of the anchorage ar-ea.Results indicate that as groundwater depth increases,chloride concentration initially decreases and then rises.In particular,the groundwater within moderately weathered argillaceous sandstone area con-tains chloride levels exceeding 10,000 mg/L,significantly affecting the corrosion of anchoring bolt mate-rials.Considering the anchorage depth,the corrosion risk of anchoring steel under different geological conditions is determined to be the moderately weathered argillaceous sandstone area,filling area,and the silty clay area,and the corresponding average anual corrosion rate is 0.45,0.31,0.22 mm/a.
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