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宁强至棋盘关高速公路共有连拱隧道5座,均为短隧道,共长914.5m。本文重点介绍回水河1#隧道进口施工方案。隧道施工中,对洞口段软基采用旋喷桩加固处理;中导洞采用正台阶开挖先行贯通,探明地质情况。主洞开挖采用侧壁导坑法。对洞口处坍方从洞内、洞外分别加固处理;洞外采用加固地表及护拱基础;洞内采用进、出口掌子面分别加强处理,即进口采用S洞-2施工方法,出口向掌子面采用回填土反压、小导管注浆加固,顺利完成了塌方处理。
There are 5 multi-arch tunnels between Ningqiang and Qipan expressway, all of them are short tunnels with a total length of 914.5m. This article focuses on the entrance of the Huishuihe 1 # tunnel construction program. During the tunnel construction, the soft foundation of the tunnel section should be treated by the rotary jet grouting pile. The middle guide tunnel should be pierced by a positive step to prove the geological conditions. The main tunnel excavation using sidewall pilot method. The cave at the cave collapse from the inside of the cave, respectively, outside the hole reinforcement treatment; the use of reinforced concrete surface and arches outside the cave base; the use of import and export of the face were to strengthen the processing, respectively, the use of imported S-2 hole construction methods, the export palm Sub-surface backfill soil back pressure, small pipe grouting reinforcement, successfully completed the landslide treatment.