不同工法组合穿越断层隧道围岩变形规律研究  

Study on the Deformation Law of Tunnel Surrounding Rock when Excavating Faults Combining with Different Construction Methods

作　　者：宫大辉[1] GONG Dahui(China Railway 18th Bureau Group Co.Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《铁道建筑技术》2023年第2期166-169,共4页Railway Construction Technology

基　　金：福建省交通运输科技项目(202106)。

摘　　要：为研究断层处围岩等级变化条件下,采用不同工法组合开挖对隧道产生的影响效应,以海沧海底隧道为例,通过数值模拟,分析4种工法组合下隧道围岩变形规律。结果表明:采用不同工法组合穿越断层,变形控制关键部位在不同等级围岩交界处,应针对性采取加固及监控量测措施;Ⅲ级围岩全断面开挖和台阶法开挖围岩变形差距较小;Ⅳ级围岩留核心土环形开挖法对隧道围岩所产生的影响相较于台阶法要小很多;受断层倾向影响,隧道最大沉降并非发生在中央拱顶,而是更靠近断层一侧的左右拱顶处;与实测数据进行对比分析,证明了模拟结果的可靠性。In order to study the influence effect of combined excavation with different construction methods on the tunnel when the surrounding rock grade changes at the fault, taking Haicang subsea tunnel as an example, the deformation law of tunnel surrounding rock by four combination of construction methods was analyzed through numerical simulation. The results show that the key of deformation control lies in the junction of different grades of surrounding rock when different construction methods are combined to cross the fault, and the reinforcement and monitoring measurement of this part should be strengthened accordingly. In grade III surrounding rock, there is a small gap between full face excavation and bench excavation. Compared with bench method, the influence of circular excavation method of retaining core soil in grade IV surrounding rock is much smaller. Affected by the fault tendency, the maximum settlement of the tunnel does not occur at the central vault, but at the left or right vault closer to the fault side. Compared with the measured data, it is indicated that the simulation results are reliable.

关 键 词：风化槽断层 工法组合 围岩变形 数值模拟 实测数据分析 

分 类 号：U455.7[建筑科学—桥梁与隧道工程] U451[交通运输工程—道路与铁道工程]