武黄城际铁路沙窝隧道过冲沟施工技术

武黄城际铁路沙窝隧道埋深较浅而且围岩稳定性差，地表有冲沟常年流水，明挖危险等级高。根据工况，提出了基于暗挖法安全通过冲沟的施工方案：冲沟上游设置砼挡水墙、地表截水沟，过冲沟段地表施作小导管注浆及浇筑砼临时封闭层；洞内采用大管棚和小导管相结合的超前支护措施。施工安全性得到了保证，对类似工程施工具有一定的借鉴意义。

Techniques for the Construction of the Shawo Gully-Crossing Tunnel of the Wu-Huang Inter-Municipal Railway

With the buried depth of the Shawo Tunnel of the Wu-Huang Inter-Municipal Railway being small,the surrounding rock of the tunnel being poor in stability,and there being gullies with water running all the year round on the ground of the construction site,it would he very dangerous to build the tunnel by means of the open-cut method,according to the specific condi- tions of which put forward in the paper is a tunneling-based,safe gully-crossing construction scheme, in which case a concrete water-retaining wall is provided at the upstream of the gully,the water-stopping ditches are provided on the ground,and the temporary sealing layer built by means of the small-pipe slip-casting method and pou- ring concrete is performed ~ inside the tunnel,the advanced support measures of the large-tube shed combined with small ducts are adopted. With all the above--mentioned technical measures taken, the safe construction of the project is thus ensured. The paper may serve as a useful reference for the construction of other similar projects.