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本文针对大跨度软岩隧道的围岩变形特点,以集呼高速公路旗下营隧道右线出口段YK197+040断面在CD法施工下围岩变形的现场监测数据为背景,整理了拱顶沉降的位移-时间曲线,探讨了拱顶沉降随开挖时间的变化情况。运用ABAQUS软件,结合实际隧道工艺建立了三维有限元模型,数值分析了隧道开挖后拱顶及周边位移的变化趋势,研究了围岩力学性能参数对隧道变形以及围岩稳定性的影响。在综合考虑监测数据与数值结果的基础上,为后续隧道安全施工提供了有益的理论建议。
In this paper, according to the deformation characteristics of surrounding rock of long-span soft-rock tunnel, taking the on-site monitoring data of YK197 + 040 section at the right exit section of Qixiaying tunnel of CD-H expressway under the deformation of CD method as the background, Displacement - time curve, discusses the vault settlement with the excavation time changes. By using ABAQUS software and the actual tunneling technology, a three-dimensional finite element model was established. The trend of vault displacement and surrounding displacement was numerically analyzed. The influence of surrounding rock mechanical parameters on tunnel deformation and surrounding rock stability was studied. Based on the comprehensive consideration of monitoring data and numerical results, it provides useful theoretical advice for the subsequent construction of tunnel safety.