In the structure design composite lining is adopted, including front pre-grouting, grid steel frame, primary shotcrete-bolting support and reinforcing concrete lining.

• 在超前地质预报工作的基础上,结构设计采用超前注浆堵水、初期格栅钢架喷砼网支护、二次现浇钢筋砼衬砌的复合式衬砌方案。