大跨暗挖车站无柱中板结构内力分析及施工技术

Internal Force Analysis and Construction Technology of Columnless Plate Structure in Large-Span Underground Excavation Station

依托实际工程,以Midas GTXNX软件平台,对大跨暗挖车站无柱中板拱形支撑结构、平板斜撑结构和变截面厚板结构3种结构形式进行建模,并进行荷载分析。经数值分析发现:在荷载条件一致的前提下,3种板结构中平板斜撑结构内力分布最优,拱形支撑结构和平板斜撑结构内力分布大致相同,但平板斜撑结构形式较为简单,能够适应于现场施工的需要,而变截面厚板结构占用空间较少,结构内力大和变形量大。

Based on the actual project, this paper uses Midas GTXNX software to model the platform, and carries out load analysis on the three structural forms of the large-span underground excavation station, namely, the pillarless plate arch support structure, the plate inclined brace structure and the variable section thick plate structure. By numerical analysis found that: on the premise of load conditions are consistent, 3 kinds of board structure optimal plate brace structure internal force distribution, support structure and flat arch brace structure internal force distribution is roughly same, but the tablet brace structure is relatively simple, can adapt to the need of site construction, and the variable cross-section plate structure takes up less space, structural internal force and deformation is big.