韩伟歌,崔振东,涂新斌,等. 2021. 不同层理面角度在层状岩体隧道围岩变形中的响应特征研究[J]. 工程地质学报,29(5):1267-1275. doi: 10.13544/j.cnki.jeg.2021-0307.
    引用本文: 韩伟歌,崔振东,涂新斌,等. 2021. 不同层理面角度在层状岩体隧道围岩变形中的响应特征研究[J]. 工程地质学报,29(5):1267-1275. doi: 10.13544/j.cnki.jeg.2021-0307.
    Han Weige, Cui Zhendong, Tu Xinbin, et al. 2021. Response characteristics of different bedding plane angles to deformation of surrounding rock in layered rock tunnel[J]. Journal of Engineering Geology, 29(5): 1267-1275. doi: 10.13544/j.cnki.jeg.2021-0307.
    Citation: Han Weige, Cui Zhendong, Tu Xinbin, et al. 2021. Response characteristics of different bedding plane angles to deformation of surrounding rock in layered rock tunnel[J]. Journal of Engineering Geology, 29(5): 1267-1275. doi: 10.13544/j.cnki.jeg.2021-0307.

    不同层理面角度在层状岩体隧道围岩变形中的响应特征研究

    RESPONSE CHARACTERISTICS OF DIFFERENT BEDDING PLANE ANGLES TO DEFORMATION OF SURROUNDING ROCK IN LAYERED ROCK TUNNEL

    • 摘要: 层状复合岩体在隧道工程中随处可见,层理面的软弱性直接决定层状岩体隧道围岩的稳定性。为了揭示层理面对隧道围岩变形的影响规律,本文采用AutoCAD软件建立某隧道横断面,将该断面图导入有限元模拟软件ABAQUS中,并利用0厚度Cohesive单元对模型嵌入不同角度层理面,从而构建含不同层理面的隧道断面模型。基于该数值模型研究了层状隧道围岩变形中层理面角度的响应特征,得到从水平层理过渡到竖直层理的过程中,围岩变形区域也从顶部变化到侧壁。结合二次开发获取的声发射模拟数据,得到了不同层理面角度下的围岩易破裂区,针对该区域分布特征,隧道施工后可采用三维激光扫描技术生成点云数据,进行隧道断面的三维重构,为规避点云数据量庞大的缺点,引入分级重采样思想,对层状围岩易变形区进行局部点云细化,通过隧道断面易变形区点云模型的实时对比分析,实现隧道围岩的高效、精确化监测,可指导隧道围岩的安全稳定运营。

       

      Abstract: There are many layer composite rock masses in tunnel engineering. The weakness of the bedding plane directly determines the stability of the tunnel surrounding rock. In order to reveal the influence of the bedding plane on the deformation of surrounding rock,a tunnel cross-section is established by using AutoCAD software. By importing it into the finite element simulation software ABAQUS,and embedding 0 thickness cohesive elements with different angles as the bedding plane,the tunnel section models with different bedding planes are constructed. Based on the numerical model,the response characteristics of bedding plane angle in the surrounding rock deformation are studied. It is found that the deformed region of the surrounding rock changes from the top to the sidewall during the transition from the horizontal bedding to the vertical bedding. Combined with the acoustic emission simulation data obtained by secondary development,the easy fracture zone of surrounding rock under different bedding plane angles is obtained. According to the regional distribution characteristics,3D laser scanning technology can be used to generate point cloud data for 3D reconstruction of tunnel sections after tunnel construction. In order to avoid the disadvantage of a large amount of point cloud data,the idea of hierarchical resampling is introduced to refine the local point cloud in the deformable zone of the layered surrounding rock. Through the real-time comparative analysis of the point cloud model in the deformation area of the tunnel section,the efficient and accurate monitoring of tunnel surrounding rock can be realized,which can guide the safe and stable operation of tunnel surrounding rock.

       

    /

    返回文章
    返回