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大跨扁平连拱隧道中墙宽度不仅直接影响隧道的开挖跨度和工程量,而且还影响着围岩-支护结构及其本身的稳定性。为确保隧道施工安全、减少开挖跨度和节约工程投资,结合广(州)贺(州)高速公路沙塘坑双向六车道连拱隧道设计和施工工程实际,以V级围岩为例,采用三维有限元数值模拟方法,对大跨扁平连拱隧道复合式中墙宽度进行优化研究。结合现场监控量测资料的分析,验证提出的复合式中墙宽度(d)的合理性,为依托工程或类似工程的设计、施工提供了依据与借鉴。
The width of the mid-span of the long-span flat-arched tunnel not only directly affects the excavation span and amount of the tunnel, but also affects the stability of the surrounding rock-retaining structure and itself. In order to ensure the safety of the tunnel construction, reduce the excavation span and save the project investment, combined with the design and construction engineering of ShaTangKeng two-way six-lane multi-arch tunnel on Hezhou (Hezhou) expressway, taking V grade surrounding rock as an example, Three-dimensional finite element numerical simulation method is used to optimize the width of the compound middle wall of a large span flat arch tunnel. Combined with the analysis of on-site monitoring data, the rationality of proposed composite middle wall width (d) is verified, which provides a basis and reference for relying on the design and construction of engineering or similar projects.