关键词: 海中洲隧道, 隧道扩建, 塌方, 注浆加固, 塌腔处理, 塌腔回填

Abstract: In the rehabilitation of Haizhongzhou tunnel, the previous collapse should be treated. Comprehensive treatment measures, including consolidation by grouted anchor bolts installed from the ground surface, collapse cave treatment and collapse cave backfilling, are proposed on basis of investigation, analysis and study on the collapse site. Conclusions drawn are as follows: 1) For tunnel rehabilitation works, the conditions of the existing tunnel should be investigated and detailed geological survey should be made so as to provide guidance for the systematic design of the rehabilitation; 2) For collapse of shallowcovered soil tunnels with the ground surface being influenced, complete and systematic treatment should be made, with all factors and their relationship being considered; 3) Reinforcing the existing collapse face, rapid treatment and rapid forming reinforcement ring are essential to avoid the further enlarging of the collapse scale; consolidating the collapse cave walls by means of shotcreting, wiremeshing, rock bolting and supporting is an effective method for collapse treatment. 

Key words: Haizhongzhou tunnel, rehabilitation, collapse, consolidation by grouting, collapse cave treatment, backfilling 