三车道隧道V级围岩浅埋段开挖施工与控制

山西忻阜高速公路长城岭隧道为三车道长隧道，所处地质多为软弱片麻岩，洞口为浅埋段，且存在局部偏压，开挖断面超过160m^2。根据工况选择三台阶预留核心土施工工法，施工中坚持“明地质、管起前、严注浆、短进尺、强支护、早封闭、勤量测、速反馈”原则，降低了成本，加快了进度，且各项指标控制到位，没有发生安全、质量事故，对同类工程有借鉴意义。

Excavation Construction and Control for Class-V Surrounding Rock in the Shallow Buried Segment of a 3-lane Tunnel

The Changchengling Tunnel of the Yibu Expressway in Xinzhou,Shanxi province is a 3-lane long tunnel,which is located in an area of mostly weak gneiss,and the tunnel adit is located in the shallow buried section,and partially pressed,with its excavated cross-section being larger than 160 m2.According to the specific conditions,the 3-bench core-soil-pre-left construction method is adopted,with the principles of making clear geological conditions,managing ahead of actual construction,strictly grouting,shortly ...