Abstract: Dabaoshan Tunnel is located within the boundary of Shaoguan City, Guanydong Province. It is 431 meters long and 9 meters in clear width. Three-centered-circle arched wall is adopted in lining,and I-steel welded with stceel centering is used in the most complicared geologival zones to reinforce the lin-ing of the tunnel. In construction, special methods are used to treat the bad geological areas, shch as concrete spraying to seal the cracks, pressure grouting to consolidate the fracture zones, concrete pumping to packfill the lava tunnel, and building-in steel vail cover plate to span the lava channels. Now the tunnelruns effectively as a whole.

Key words: tunnel, surrounding rock, slide, sprayed concrete, pumping concrete, surrouding rock pres-sure, lava tunnel

摘要： 宝山隧道位于广东关境内,全长43 m,净,心圆拱曲墙式砌。地质情况复杂,设计在不良地质地带采用钢花拱架焊接工字钢加强砌。施工中采用了喷射混凝土封闭裂隙,压浆固结破碎带,送混凝土。从运营效果看,隧道整体质量较好。