CAJ | 학술논문

在十白高速花石沟隧道的施工过程中，遇到了大面积的炭质片岩，其强度低、风化快、易吸湿、变形大，采用普通隧道爆破技术和开挖施工工艺时，超挖现象普遍，支护变形严重。本文应用 FLAC3D 软件进行炭质片岩隧道拱顶沉降数值模拟，得出其流变变形规律，为支护设计和施工工艺优化提供了依据。根据花石沟隧道的实际情况，提出了弱爆破与机械联合开挖方法，其主要技术措施包括：下台阶分区作业；小进尺，快初支；预留吸水软化层；减弱爆破设计；缩短二衬间隔。工程实践证明，该方法有效控制了炭质片岩隧道施工中的超挖现象和支护变形。
재십백고속화석구수도적시공과정중，우도료대면적적탄질편암，기강도저、풍화쾌、역흡습、변형대，채용보통수도폭파기술화개알시공공예시，초알현상보편，지호변형엄중。본문응용 FLAC3D 연건진행탄질편암수도공정침강수치모의，득출기류변변형규률，위지호설계화시공공예우화제공료의거。근거화석구수도적실제정황，제출료약폭파여궤계연합개알방법，기주요기술조시포괄：하태계분구작업；소진척，쾌초지；예류흡수연화층；감약폭파설계；축단이츤간격。공정실천증명，해방법유효공제료탄질편암수도시공중적초알현상화지호변형。
A large area of carbonaceous schist was met with in the construction of Huashigou Tunnel on Shiyan-Baihe Expressway.Carbonaceous schist has the properties of low strength,rapid weathering, high hygroscopicity and large deformation.The common construction technology of tunnel blasting and excavation would cause the overbreaking of the tunnel and serious deformation of the supports. This paper uses FLAC3D software to simulate the vault subsidence of carbonaceous schist tunnel and obtains its rheological deformation law,which provides a basis for the supporting design and the opti-mization of construction technology.According to the actual situation of Huashigou Tunnel,it puts forward a method of weak blasting combined with machine excavation.The main technical measures are as follows:partition constructing in the lower section of the tunnel;small digging length,rapid preliminary supporting;reserved water-absorbing softened layer;weak blasting;shortening the time interval of the secondary concrete lining.The construction practice proves that the proposed method can effectively control the overbreaking of tunnel with carbonaceous schist and the deformation of sup-ports.