大公山输水隧洞跨越暗河施工技术

Construction technology of Dagongshan water diversion tunnel traversing underground river

介绍了云南省牛栏江-滇池补水工程中大公山输水隧洞跨越大型地下暗河的处理措施。通过详细的水文地质调查及示踪试验,摸清了暗河的形态及其与隧洞的空间关系。在此基础上,通过适当的围岩加固措施,于暗河两端修建施工桥台,采取简支整体箱梁结构的方式跨越暗河。工程实践表明,该方案具有结构型式简单、节约工期等优点,且避免了对原暗河水文环境的破坏。

The engineering measures adopted in the project of Dagongshan water diversion tunnel traversing underground river, an important component of Niulan River - Dianchi Lake Water Diversion Project, are presented. The conformation of the under- ground river and its spatial relation with the tunnel was explored by hydro - geological investigation and tracer tests. The rein- forcement for surrounding rock was conducted and construction abutments were built at both sides of the river, above which a sim- ple supported box - beam was constructed for traversing the river. The engineering practice show that the traversing solution of the tunnel has the advantages of simple structure and relatively short construction period while avoiding damages to the hydrological environment of the underground river.