海水入侵对地铁地下结构侵蚀性的统计分析

摘要

地下水的腐蚀性严重影响地铁的安全运营，正确评价地下水的腐蚀性是解决问题的关键。以深圳地铁11号线为例，对全线30个工点627个地下水水质分析样本进行统计，得到整条线路地下水腐蚀强弱分布状态。结合线路通过区的填海和海水侵入背景进行分析，得出如下结论：具有典型的海水侵入背景下的地下水侵蚀性与海水侵入（包括填海区）范围密切相关，地铁地下结构宜按干湿交替环境进行钢筋腐蚀等级判别。该研究为滨海城市海水入侵区地铁线路地下水腐蚀性评价提供指导。%The safety operation of underground railway is seriously affected by water corrosion .The key to solve the problem is correctly evaluating the corrosion of groundwater .Taking Shenzhen Metro Line 11as an example, erosion analysis reports of 627groundwater samples taken from 30 sections of Metro Line 11 are collected.The whole line of groundwater corrosion intensity distribution is obtained , which is analyzed combined with the seawater intrusion area that passed through by Shenzhen Metro Line 11.The conclusion is the following.For the typical environment of seawater intrusion, there is a closely relationship between the groundwater erosion and the distribution of seawater intrusion, which includes the reclamation area.Discrimination of steel corrosion grade of subway underground structure should be carried out according to the environment of wet and dry cycles .The study provides guidance for the groundwater corrosion evaluation of subway lines in the coastal city with seawater intrusion area .