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天桥水电站除险加固工程基坑开挖过程中发生渗透破坏,基坑塌陷难以下挖,设计者另辟蹊径采用框格式地下连续墙作为基坑开挖过程中的临时性挡土墙。该挡墙在开挖过程中既承担侧向水压力、土压力等水平向荷载,又承受顶部的垂直向荷载,此类工程措施在国内及水利水电行业内未见报道。文章主要介绍了框格式地下连续墙的主要结构特点、技术难点,供类似工程参考。
During the excavation of foundation pit for reinforcement and reinforcement project of Tianqiao Hydropower Station, it is difficult to excavate the foundation pit collapse. The designer also uses the box format underground continuous wall as a temporary retaining wall in the excavation of foundation pit. During the excavation, the retaining wall not only undertakes horizontal loads such as lateral water pressure and earth pressure, but also receives vertical loads at the top. Such engineering measures have not been reported in the domestic and water conservancy and hydropower industries. This paper mainly introduces the main structural features and technical difficulties of the diaphragm wall in box format for reference of similar projects.