隧洞衬砌裂缝问题

Crack Problem of the Lining of Tunnel

根据小孤山隧洞工程实践提出隧洞裂缝可分为原生裂缝和次生裂缝,总结工程经验提出了防裂应注意的问题,如需采取适当避免不合理开挖断面、适当加粉煤灰、掺加微纤维等措施。按小孤山隧洞工程经验施工的大孤山隧洞至今末发现裂缝。因此严格按照规范附录要求施工解决"无洞不裂"问题是可能的。

According to practice of Xiaogushan tunnel project, this paper puts forward that the crack type ot chverslon tunnel could be divided into original crack and secondary crack and some problems of crack prevention that should be considered. It is mainly about the measures how to avoid unreasonable excavated section, adding fly ash appropriately etc. There are few cracks on Xiaogushan tunnel. Therefore, the standards should be strictly obeyed and the crack problems would be solved.