硫酸盐作用下隧道衬砌腐蚀规律研究

针对西南地区隧道结构硫酸盐腐蚀现状,对围岩环境进行了模拟,采用相似理论,进行了4种工况的试验。在特定时间段以钻芯法测取顶部、拱腰、拱脚及边墙位置的混凝土强度,并根据测试结果分析了各部位腐蚀强度的关系,试验得出:隧道衬砌各部位的强度随时间以抛物线变化,先增大后减小,其中顶部腐蚀速度最大,其他部位的腐蚀速度随着衬砌水平夹角的减小而减小,通过对各部腐蚀强度的关系分析,得出了隧道衬砌各部腐蚀强度的关系式。

Corrosion Behavior of Tunnel Lining under Sulfate Effect

The lining structures of tunnels in Southwest China are subject to sulfate corrosion.The surrounding rock conditions are simulated and tests are made on 4 working conditions of tunnel lining.The strength of the concrete lining at the crown,arch waist,arch foot and sidewall is tested and the relationship among the corrosion intensities at different positions is analyzed according to the test results.Conclusions drown are as follows： the strength of the tunnel lining at each position develops in the form of parabola,increasing in the early stage before decreasing in the late stage;the corrosion speed of the crown lining is the highest and the corrosion speed of the lining at other positions decreases as the horizontal angle of the lining decreases;the equation for the corrosion intensity of the lining at each position is obtained by analyzing the relationship among the corrosion intensities of the lining at different positions.