腾讯七星数据中心隧道群围岩压力分析

Analysis on Surrounding Rock Pressure of Tencent Seven Star Data Center Tunnel Group

摘要: 以贵阳腾讯七星数据中心隧道工程为研究背景，该工程属于五线并行小间距浅埋大断面隧道群，为国外首例。隧道地质条件较好处采用CD法施工，较差处调整为CD法 + 台阶法施工。隧道群采用同步推进、同步开挖的方法，由于相邻隧道开挖产生应力叠加、围岩应力集中，通过建立隧道群压力计算模型，应用朗肯土压力理论、比尔鲍曼理论，计算隧道开挖时围岩的水平侧压力，垂直压力，分析隧道围岩压力的分布特征和拱顶的下沉量，计算隧道的最小支护反力，研究结果可为隧道支护设计提供参考。

Abstract: Taking Guiyang Tencent Seven Star Data Center Tunnel Project as the research background, the project belongs to the construction of five closely spaced parallel, shallow, large-section tunnel group, which is the first case at home. The CD method is used in the place where the tunnel geo-logical conditions are good, and the poor place is adjusted to the CD method and step method con-struction. The tunnel group adopts the method of synchronous propulsion and synchronous exca-vation. Due to the stress superposition and the surrounding rock stress concentration caused by the excavation of adjacent tunnels, by establishing the tunnel group pressure calculation model, and using the Rankine stress theory and the Bill Bowman theory to calculate the horizontal side pressure and vertical pressure of the tunnel excavation surrounding rock, the distribution char-acteristics of tunnel surrounding rock pressure and the subsidence of the dome are analyzed. The minimum support reaction force of the tunnel is calculated. The research results can provide ref-erence for tunnel support design.