青岛地铁穿河隧道施工方案优化研究

发布时间：2018-06-10 04:36

本文选题：青岛地铁 + 穿河隧道　；参考：《长江科学院院报》2014年11期

【摘要】：青岛地铁2号线枣李区间隧道下穿李村河,隧洞顶部位于强风化花岗岩层中,上覆有粉质黏土层和砂层,必须确保不破坏上部天然隔水层,并达到快速安全穿越的目的。首先根据地质条件和施工经验初步选定了5个施工方案;再利用数值方法模拟隧道开挖过程,考虑施工速度、开挖步距离、开挖方式和支护结构对围岩变形和塑性区的发展范围的影响,研究各方案下隧道围岩的变形规律,比对控制点变形量和拱顶沉降变化曲线,在5个方案中选取最合适的方案;最后针对确定的施工方案,以穿河隧道上覆岩层塑性区范围、隧道沉降和收敛值为控制指标,进行了施工参数的二次优化。在确保隔水层隔水效果的前提下,提高施工速度,为隧道安全、快速施工提供了科学依据和技术指导。
[Abstract]:Under the tunnel of Zaoli section of Qingdao Metro Line 2, the tunnel passes through Licuanhe. The top of the tunnel is located in the strongly weathered granite layer, with silty clay layer and sand layer overlying, so it must be ensured that the upper natural water-isolating layer is not destroyed and the purpose of rapid and safe crossing is achieved. Firstly, five construction schemes are selected according to the geological conditions and construction experience, and then the tunnel excavation process is simulated by numerical method, considering the construction speed and the excavation step distance. The influence of excavation mode and support structure on the development range of surrounding rock deformation and plastic zone is studied. The deformation law of tunnel surrounding rock under each scheme is compared with the deformation of control point and the curve of vault settlement. The most suitable scheme is selected in five schemes. Finally, according to the definite construction plan, taking the plastic zone of overlying strata, the settlement and convergence value of tunnel as the control index, the secondary optimization of construction parameters is carried out. On the premise of ensuring the water-insulation effect, the construction speed is improved, which provides scientific basis and technical guidance for tunnel safety and rapid construction.
【作者单位】：山东科技大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(51174128) 高等学校博士学科点专项科研基金(20123718110007)
【分类号】：U455;U459.1

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