开挖工法对灰岩地区小净距公路隧道稳定性影响研究  

Study on the Influence of Excavation Method on the Stability of Neighborhood Highway Tunnel in Limestone Area

作　　者：王玮 史奎 郑茂源 张新正 WANG Wei;SHI Kui;ZHENG Mao-yuan;ZHANG Xin-zheng(Shandong Road&Bridge Construction Group Co.,Ltd.,Ji'nan 250014,China)

机构地区：[1]山东省公路桥梁建设集团有限公司,济南250014

出　　处：《价值工程》2023年第32期144-146,共3页Value Engineering

摘　　要：由于受到地形地质条件的限制,城市之间高速公路不可避免地会采用小净距隧道结构形式。考虑不同开挖工法对小净距隧道围岩和中夹岩稳定性影响,采用数值模拟的方法,从位移、应力和塑性区等方面开展研究。结果表明:针对灰岩地区的小净距公路隧道,采用全断面开挖方式,隧道周边岩体受扰动大,围岩不稳定;采用CD法和上下台阶法施工,隧道周边岩体扰动较小;采用三台阶开挖方式,对隧道周围岩体影响最小。实际开挖过程中,应结合现场施工情况,合理选择最优开挖方式,降低施工风险,达到低碳环保的要求。Due to the limitations of terrain and geological conditions,it is inevitable that expressways between cities will adopt neighborhood tunnel structure.Considering the influence of different excavation methods on the stability of surrounding rock and intermediate rock in neighborhood tunnels,numerical simulation method is used to conduct research from the aspects of displacement,stress,and plastic zone.The results show that for neighborhood highway tunnels in limestone areas,using full section excavation method can cause significant disturbance to the surrounding rock mass and instability of the tunnel.When using the CD method and the upper-lower step method for construction,the rock disturbance around the tunnel is relatively small.Adopting a three-step excavation method has the least impact on the surrounding rock mass of the tunnel.In the actual excavation process,the optimal excavation method should be reasonably selected based on the on-site construction situation to reduce construction risks and meet the requirements of low-carbon environmental protection.

关 键 词：小净距隧道 灰岩 开挖工法 中夹岩 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]