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如何保证上软下硬岩质大跨隧道拱顶围岩的稳定,进而控制上覆地层的变形是浅埋暗挖大跨隧道研究热点。依托大连地铁一期工程203标段兴工街站,利用三维数值模拟,分析在不进行注浆加固和不施加任何支护措施的情况下隧道与围岩的变形规律,详细分析总结了围岩位移场、地层沉降、地表沉降、水平位移等方面的相关结论,揭示隧道与围岩变形的主要影响因素和关键工序。研究成果可以为此类隧道修建积累实践经验,为控制措施的制订提供科学依据。
How to ensure the stability of the surrounding rock of the dome of the long tunnel under the soft rock and then control the deformation of the overburden is the hotspot of research on the long-distance tunneling of the shallow buried tunnel. Relying on the first section of Dalian Metro 203 section Xinggong Street Station, the use of three-dimensional numerical simulation, without reinforcement grouting and without any support measures the tunnel and surrounding rock deformation law, a detailed analysis of the surrounding rock displacement Field, strata settlement, surface subsidence, horizontal displacement and other related conclusions, reveals the tunnel and surrounding rock deformation of the main factors and key processes. The research results can accumulate practical experience for such tunnel construction and provide a scientific basis for the formulation of control measures.