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首页> 外文期刊>American journal of applied sciences >Evaluation of the Tunnel Face Stability through a Ground Stress Analysis with a Hemispherical Geometry Approximation | Science Publications
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Evaluation of the Tunnel Face Stability through a Ground Stress Analysis with a Hemispherical Geometry Approximation | Science Publications

机译：半球形几何近似通过地应力分析评估隧道工作面稳定性科学出版物

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> The evaluation of the stability of the excavation face is an important aspect in the design of a tunnel. When it is not possible to ensure excavation face stability in natural conditions, it is in fact necessary to intervene with remarkably costly reinforcement operations. The analysis of the stability conditions of an excavation face can be conducted, with a certain degree of detail, through numerical modelling. Simplified analytical models exist for shallow tunnels, but fewer are available for deep tunnels. One of the analytical methods most commonly used in the study of the stress conditions at the excavation face in deep tunnels is described in this study: The convergence-confinement method adapted to a spherical geometry. This method has here been extended to rock masses, which present a more complex rupture criterion (curved and not simply linear) than that of soils. The presented solution is of a finite difference numerical type. An extensive parametric analysis conducted on soils and rock masses has led to the estimation of the maximum lithostatic stress that still foresees the absence of a plastic zone around the hemisphere, which has been used to represent the excavation face. Therefore, this study makes it possible to obtain a preliminary estimation of the maximum depth of a tunnel in a certain type of soil or in a rock mass in which it is still possible to advance without the necessity of excavation face reinforcement operations. However, a more detailed and reliable analysis still requires more sophisticated instruments, such as numerical modelling.
机译： >评估开挖面的稳定性是隧道设计中的重要方面。当在自然条件下无法确保开挖面的稳定性时，实际上有必要进行非常昂贵的加固操作。可以通过数值建模在一定程度上详细地分析挖掘工作面的稳定性条件。对于浅埋隧道，存在简化的分析模型，但对于深埋隧道，可用的分析模型较少。在这项研究中，描述了一种在深部隧道开挖面应力条件研究中最常用的分析方法：适于球形几何形状的会聚约束方法。这种方法在这里已经扩展到岩体，岩体呈现出比土壤更复杂的破裂准则（弯曲而不是简单的线性）。提出的解决方案是有限差分数值类型。在土壤和岩体上进行的广泛参数分析导致对最大岩石静应力的估计，该应力仍预示着半球周围没有塑性区，该塑性区已被用来代表开挖面。因此，该研究使得可以初步估计在某种类型的土壤或岩体中隧道的最大深度，而在这种情况下仍可以前进而无需进行开挖面加固操作。但是，更详细和可靠的分析仍然需要更复杂的工具，例如数值建模。

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