Loess has the characteristics of structural properties, such as incomplete consolidation, collapsibility;And the multi-arch tunnel of highway has complex excavation steps and structure stress.

• 摘要由于黄土具有结构性、欠压密性和土结构性受损易发生湿陷等特性，再加上会路连拱隧道施工开挖工序多，结构受力复杂。