考虑氯离子侵蚀的墩柱保护层厚度影响系数研究

Study on Influence Coefficient of Chloridion Erosion on Protective Layer Thickness of Pier Column

摘要:

为了研究氯离子侵蚀对混凝土墩柱保护层厚度的影响规律,对不同矿物掺合料以及不同掺合比例下的混凝土抗氯离子渗透应能以及保护层厚度影响系数进行分析。研究表明：用一定比例的矿物掺合料代替水泥熟料能够有效提高混凝土抗氯离子性能和改变保护层厚度影响系数。

Abstract:

The construction of new project near the existing urban shield tunnel is more and more difficult to avoid the subject in the city construction. Whether or not to upload or unload above the shield tunnel all produce the long-term influence on the structural stress and safe operation of shield tunnel. Aiming at this problem, the load replacement method of excavation first and light padding later is proposed in filling the embankment to solve the influence of embankment filling construction on the shield tunnel. In the analysis process, relying on an actual project, the finite element software Plaxis is used to establish the subgrade - tunnel - soil coupling model for the consideration of the displacement and excess pore water pressure. The influence of subgrade construction on the subway shield tunnel is studied, the deformation is analyzed and the relevant conclusion is obtained. The effects can be referenced for the similar projects.