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岩堆体呈松散状,自稳能力差,围岩软弱,自稳时间短,危及隧道施工现场的整体稳定。鹰嘴岩隧道进洞口段岩堆体浅埋地段,借鉴以往岩堆体地层隧道施工的成功经验,慎重确定施工方案,采用地表加固岩堆体改善围岩性质、洞口大管棚超前支护施工手段,洞身开挖支护采用环行导坑法进洞,TSD超前预报系统根据已开挖隧道地段的地质调查,预测掌子面前方范围内围岩的地质情况与实际情况吻合较好,对隧道施工具有指导作用。对施工监测数据进行收集和分析,说明施工支护有效,采用的施工方案是可行的。
Rock pile body is loose, poor self-stability, weak rock, self-stabilization time is short, endangering the overall stability of the construction site of the tunnel. Yingkou rock tunnel into the entrance section of rock pile shallow buried section, with reference to the successful experience of previous rock pile body formation tunnel construction, carefully determine the construction program, the use of surface reinforcement rock piles to improve the nature of rock, hole large pipe shed advance support construction Means that the excavation and support of the tunnel body adopts the method of annular guide pit method to penetrate into the tunnel. According to the geological survey of the excavated tunnel section, the TSD advanced prediction system predicts that the geological conditions of the surrounding rock in front of the plane of the tunnel face are in good agreement with the actual situation. Tunnel construction has a guiding role. The construction monitoring data are collected and analyzed, which shows that the construction support is effective and the construction scheme adopted is feasible.