大跨黄土隧道塌方原因分析及处治方案设计

阳曲1号隧道在施工过程中发生塌方事故，通过隧道施工图和现场调研对塌方成因进行了分析。在此基础上，从地表防水、塌方体加固、分部开挖、加强支护等方面进行了塌方处治。监测数据表明，拱顶下沉趋于稳定，治理效果较好。

Cause Analysis and Treatment Design of Large-span Loess Tunnel Collapse

Couapse of Yangqu No.1 tunnel occurred during the construction. The cause of the collapse is analyzed according to the construction drawings and the investigation of the site. On the basis of the analysis, the collapse treatment is conducted of waterproof from the surface, reinforced by a collapsed cube, and excavated by branch, strengthening support, et al, according to the monitoring data. The result shows that the crown settlement is stable. Good results have been achieved.