秦岭山区大理岩强富水区特长隧道施工排水技术

Drainage Technique of Extra-long Tunnel Construction in Marble and Water-rich Area of Qinling Mountains

在小断面隧道施工中，因为其场地狭小，洞内设备布置是否科学合理直接关系到安全和进度，因此排水一般都作为施工方案或预案的重点内容。在面对大理岩强富水区，特别是反坡排水高差达到160 m 的隧道施工中，排水方案显得尤为重要。本文介绍分级变级排水方案在该项目的成功实施，希望为以后类似工程施工提供有益的参考。

In the construction of small section tunnel,whether the arrangement of the equipment in the tunnel is reasonable is directly related to the safety and progress as a result of the small site.So,generally speaking,the drainage becomes a main item of the construction.In the water-rich area of marble,especially on the reverse slope,the water level ranges up to 160 meters when drainage happens,thus,the drainage scheme is particularly important.What’s more,the successful implemen-tation of this project can provide a useful reference for similar projects in the future.