摘要
锦所隧道为贵州省三穗至黎平高速公路的控制性工程之一,隧道ZK88+078~ZK88+110段原设计为双侧壁导坑法开挖,但该段岩层为强风化层,属极软岩类,开挖后发生了小范围的坍塌,因此设计变更为CRD工法开挖。在2工法开挖中对隧道的沉降进行了监测,分析了监测数据,并基于最小二乘法,用三次曲线模型对沉降数据进行了拟合。结果表明:在控制浅埋软弱破碎围岩隧道变形方面,CRD工法优于双侧壁导坑法;三次曲线能很好地拟合沉降数据,R^2均大于95%,拟合结果能为后续的施工提供指导;采用双侧壁导坑法时,第一部分导洞的开挖,地表沉降变化非常大,施工中需特别注意此阶段的及时支护;采用CRD工法开挖时上部导洞的开挖导致地表沉降量占总沉降量的一半以上。
Jinsuo tunnel is one of the dominant engineering from Sansui to Liping expressway in Guizhou Province and the original design of the tunnel ZK88 ＋ 078～ZK88 ＋ 110 adopts double side drift method excavation, which has been adjusted to CRD construction method excavation because this section has strong weathering, which belongs to extremely soft rock and the collapse will occur in a small range. Supervision for the tunnel sedimentation in the process of excavation are made to analyze the monitoring data and make the fitting of the sedimentation data by using cubic curve regression model based on least square method. The result shows that the CRD method is better than. double side drift method; cubic curve can well fit the sedimentation, all of R^2 are higher than 95% and the fitting results can provide guidance for the follow-up construction. When adopting the double side drift method, the change of the ground surface settlement is very large and the timely supported should be paid special attention to in construction; ground surface settlement amount of the excavation during the upper pilot tunnel accounts for half of the total settlement when adopting the CRD construction method excavation.
出处
《湖南文理学院学报（自然科学版）》
CAS
2016年第1期75-78,共4页
Journal of Hunan University of Arts and Science(Science and Technology)
关键词
锦所隧道
浅埋隧道
围岩变形
监控量测
Jinsuo tunnel
shallow tunnel
deformation of surrounding rock
monitoring and measurement
