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首页> 外文会议>2007采矿科学与安全技术国际学术会议 >Difference Analysis on 2D and 3D Numerical Models to Tunnel Support
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Difference Analysis on 2D and 3D Numerical Models to Tunnel Support

机译：隧道支撑的2D和3D数值模型的差异分析

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Numerical calculation is important to the tunnel support design, but the array pitch is not considered in many cases, so a 2D model is applied to substitute for the 3D model. This paper discusses the difference of the two models by means of the FLAC3D with Mohr-Coulomb and Drucker-Prager mechanical model. The plain strain models fixed on end faces or axes direction of tunnel and 3 dimensions models applied on end faces with displacement caused by initial stress field are created. It can be concluded that the plastic zone of the plain strain model is bigger than that of 3D model, and the failure is earlier. Drucker-Prager mechanical model is suitable for soft clay and the results are over safe to rock materials. Then the phenomenon is discussed in theory simply, which reason is that the two kinds of models have different boundary conditions.
机译：数值计算对于隧道支护设计很重要，但是在许多情况下并未考虑阵列间距，因此使用2D模型代替3D模型。本文通过带有Mohr-Coulomb和Drucker-Prager力学模型的FLAC3D讨论了两种模型的区别。建立了固定在隧道端面或轴线方向上的平面应变模型，以及在具有初始应力场引起的位移的端面上应用了3维模型。可以得出结论，平面应变模型的塑性区比3D模型的塑性区大，并且破坏较早。 Drucker-Prager力学模型适用于软粘土，其结果对于岩石材料而言是绝对安全的。然后对这一现象进行了理论上的简单讨论，原因是这两种模型具有不同的边界条件。

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