不良地质条件隧洞施工技术

The study on the technique of unfavorable geological condition tunnel construction

土卡河水电站导流施工隧洞岩性软弱,裂隙发育,风化程度严重,稳定性差,给施工带来一定难度。根据地质条件和实际施工情况,施工中采取了超前支护、分步开挖、稳步推进的方法,并增加了超前小导管及锁脚小导管、锁脚锚杆等支护方式,加强测量观测工作。该工程施工技术具有其特点和先进性,为同类工程提供了积极的借鉴。

The diversion tunnel of Tuka river hydropower plant has been in a state of a weak lithological character, a developed crevasse, a serious rate of weathering and unstable stability, which bring certain difficulty to the construction. The advance supporting and protecting, step by step excavation and steady progress are adopted according to the geological condition and the actual construction situation. And advance small duct grouting; lock foot small duet grouting and lock foot anchoring are used as reinforced support with a survey observation. The techniques used in the tunnel construction have its distinctive features and the technical advancement, which has provided positive reference for the similar project.