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山区高速公路工程地质条件复杂,软岩隧道的大变形难支护问题十分突出,开展围岩变形机理研究并提出相应的支护对策尤为重要。以河北省西部山区某浅埋软岩隧道为例,通过分析隧道工程地质条件,定性地研究土石混合体隧道围岩稳定性。采用能较好处理岩土体工程中各种复杂非线性问题的ABAQUS软件,建立隧道围岩三维数值仿真模型,刻画出隧道的动态开挖过程,对软岩隧道支护前后围岩的应力场与位移场特征以及土石混合体软岩隧道支护结构的受力情况进行分析,为研究系统锚杆在软岩隧道中的作用机理提供理论依据。结合现场监控量测,提出土石混合体软岩隧道部分取消系统锚杆的建议。
The engineering geological conditions of mountainous expressway are complex. The problem of large deformation and difficult support of soft rock tunnel is very prominent. It is very important to carry out research on deformation mechanism of surrounding rock and put forward corresponding support measures. Taking a shallow soft rock tunnel in the western mountainous area of Hebei Province as an example, the stability of surrounding rock of the rock-soil mixture tunnel is studied qualitatively by analyzing the engineering geological conditions of the tunnel. The ABAQUS software, which can deal with various complex nonlinear problems in geotechnical engineering, is adopted to establish the three-dimensional numerical simulation model of surrounding rock of tunnel and to characterize the dynamic excavation process of tunnel. The stress field of surrounding rock before and after soft rock tunnel support And the characteristics of the displacement field as well as the stress of the soft rock tunnel supporting structure of the rock-soil mixture, which provides a theoretical basis for studying the action mechanism of the system rock bolt in the soft rock tunnel. Combined with on-site monitoring measurement, the suggestion of partial canceling of system anchor rod is put forward for soft rock tunnel with soil-rock mixture.