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首页> 外文期刊>Key Engineering Materials >Modeling of the Effect of Excavation Mode on the Extent of the Anisotropic Zone Surrounding Deep Tunnels
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Modeling of the Effect of Excavation Mode on the Extent of the Anisotropic Zone Surrounding Deep Tunnels

机译：开挖模式对深埋隧道各向异性区域影响程度的建模

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A series of numerical model tests were performed to investigate the behaviour of the anisotropic rock surrounding circular excavations under high confining pressures. The aim was to provide information on the formation of fractures and failure around deep level rock tunnels under controlled conditions. Solid cubes containing a circular hole were confined to a vertical pressure with same as the confinement in the horizontal directions. In this modeling, the inhomogeneous rock is generated by using Weibull parameters which are related to the microstructural properties determined by crack size distribution and grain size. The fracture angle is assumed to be 45°. The observed failure zone around the excavation was simulated using both the maximum tensile strain criterion and Mohr-Coulomb criterion respectively (as the damage threshold). And RFPA (Realistic Failure Process Analysis) code was used as the calculating tool in this modelling, three opening modes are simulated and compared. Computational model predictions that include crack propagation and failure modes of rock show a good agreement with those of the observation in site. It is pointed out that the damage evolution of EDZ strongly depends on the inhomogeneous, the excavation mode, anisotropic property, and the various loading conditions. Concerning the existence of a weak plane, the amount of displacement at the side wall of the tunnel was quite large, since the shear deformation occurred in EDZ. The model is implemented in RFPA code and is able to represent the change in fracture patterns between the solid and jointed parts. This provides confidence for the application of the numerical model to the design of rock tunnels at great depth.
机译：进行了一系列数值模型试验，以研究高围压下圆形开挖过程中各向异性岩石的行为。目的是提供有关在受控条件下深层岩石隧道周围裂缝形成和破坏的信息。将包含圆孔的实心立方体限制在垂直方向上的压力，与水平方向上的限制相同。在该模型中，通过使用威布尔参数生成不均匀岩石，该参数与由裂纹尺寸分布和晶粒尺寸确定的微观结构特性有关。假定断裂角为45°。分别使用最大拉伸应变准则和Mohr-Coulomb准则（作为破坏阈值）对开挖周围观察到的破坏区域进行了模拟。在此建模中，以RFPA（现实故障过程分析）代码作为计算工具，对三种开放模式进行了仿真和比较。包括岩石的裂纹扩展和破坏模式在内的计算模型预测与现场观测结果吻合良好。需要指出的是，EDZ的损伤演化很大程度上取决于不均匀性，开挖模式，各向异性和各种载荷条件。关于弱平面的存在，由于EDZ发生了剪切变形，因此隧道侧壁的位移量很大。该模型以RFPA代码实现，并且能够表示实体零件和接合零件之间的断裂模式变化。这为数值模型在大深度岩洞设计中的应用提供了信心。

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