介绍了那国隧道下穿隆百高速公路施工段,大管棚和小导管超前支护,采用双侧壁导坑法和临时仰拱台阶法的开挖方法,施工过程中做好监控量测工作,安全、顺利地完成了隧道下穿段施工任务。高速公路路基沉降在允许范围内,隧道没发生任何异常状况,证明采取的技术措施是正确的。成功经验可供同类工程参考。 Introduced the country under the tunnel through Longbow Expressway construction section, a large pipe shed and small catheter advance support, using double-sided wall pit method and temporary inverted arch method of excavation method, good monitoring during construction Work, safety, successfully completed the construction of the tunnel under the cross-section task. Subsidence of freeway embankment within the allowable range, the tunnel did not happen any abnormal situation, to prove that the technical measures taken are correct. Successful experience for similar projects for reference.