全断面顶管法在饱和软土地层静安寺站地铁工程的研究与应用

Research and Application of Full-Face Pipe Jacking Method in Saturated Soft Soil Layers for the Jing′an Temple Station Subway Project

  • 摘要: 上海地铁14号线静安寺站是采用大断面矩形顶管暗挖工艺建造地铁车站主体结构。为解决地下工程施工与地质环境以及周边建筑矛盾的问题,文章基于静安寺地铁车站主体结构工程,提出一种适用于饱和软土地层中心城区地铁车站建造的全断面顶管暗挖施工方法。该工法创新性地提出深覆土洞门密封止水技术、深埋管节自补偿止退技术、土体改良管节减摩-浆液固化技术、钢-混凝土复合顶管管节结构、复合管节钢壳拼装吊装技术和复合管节内衬浇筑技术,攻克了地铁车站顶管施工可能存在的深覆土近间距顶管掘进和超大断面顶管管节施工等工程难题,实施效果良好,可为同类地层地铁建设提供参考和借鉴。

     

    Abstract: The Jing′an Temple Station of Shanghai Metro Line 14 is a project where the main structure of the sub? way station is constructed using the large-section rectangular pipe jacking method. To address the conflicts between underground construction, geological environment, and surrounding buildings in the main structure works of Jing′an Temple Station, this paper proposes a method suitable for the construction of subway stations in saturated soft soil layers in central urban areas using full-face pipe jacking method. Innovatively, the method introduces deep overburden tunnel portal water-stop technology, deep-buried pipe segment selfcompensating anti-retreat technology, soil improvement pipe segment friction reduction-slurry solidification technology, steelconcrete composite pipe jacking segment structure, composite segment steel shell assembly and hoisting technology, and composite segment inner lining casting technology. These innovations overcome engineering challenges such as deep overburden close-spacing pipe jacking advancement and construction of ultra-large section pipe jacking segments in subway station construction, achieving good implementation results and providing references for subway construction in similar strata.

     

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