隧道特大溶洞处理方案研究

Study on the Treatment Scheme of Super-huge Karst Tunnel

高速隧道特大溶洞在施工过程中一直存在大面积塌方,腔壁不稳定等问题。根据广西河池至都安高速谢家峒一特大溶洞的实际情况及安全经济的原则,针对全断面回填泵送砼反开挖法、直接回填混合料反开挖法、斜井回填混合料反开挖法及整体钢架台车支护法四种施工方案,进行了风险评估、可行性及经济性比较。综合对比表明:泵送素混凝土回填反开挖的方案为首选方案。

During High speed tunnel construction,super-huge kars was met. Because it＇s cavity wall was instable,it needed reinforcing. According to the actual situation,safe and economic principles,the four kinds of construction methods were put forward. They were the full cross section of backfilling pumping concrete anti excavation method,direct backfill mix the excavation method,slope backfill mix the excavation method and integral steel trolley supporting method. The four kinds of scheme were compared from risk assessment,feasibility and economic. Comprehensive comparison showed pumping concrete backfill back excavation scheme was preferred.