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首页> 外文期刊>Advances in civil engineering >The Numerical Simulation of Hard Rocks for Tunnelling Purposes at Great Depths: A Comparison between the Hybrid FDEM Method and Continuous Techniques
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The Numerical Simulation of Hard Rocks for Tunnelling Purposes at Great Depths: A Comparison between the Hybrid FDEM Method and Continuous Techniques

机译：大深度掘进硬岩的数值模拟：混合FDEM方法与连续技术的比较

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摘要

Tunnelling processes lead to stress changes surrounding an underground opening resulting in the disturbance and potential damage of the surrounding ground. Especially, when it comes to hard rocks at great depths, the rockmass is more likely to respond in a brittle manner during the excavation. Continuum numerical modelling and discontinuum techniques have been employed in order to capture the complex nature of fracture initiation and propagation at low-confinement conditions surrounding an underground opening. In the present study, the hybrid finite-discrete element method (FDEM) is used and compared to techniques using the finite element method (FEM), in order to investigate the efficiency of these methods in simulating brittle fracturing. The numerical models are calibrated based on data and observations from the Underground Research Laboratory (URL) Test Tunnel, located in Manitoba, Canada. Following the comparison of these models, additional analyses are performed by integrating discrete fracture network (DFN) geometries in order to examine the effect of the explicit simulation of joints in brittle rockmasses. The results show that in both cases, the FDEM method is more capable of capturing the highly damaged zone (HDZ) and the excavation damaged zone (EDZ) compared to results of continuum numerical techniques in such excavations.
机译：掘进过程导致地下开口周围的应力变化，从而导致周围地面的扰动和潜在损坏。特别是在涉及大深度的坚硬岩石时，岩体在开挖过程中更有可能以脆性方式响应。为了捕获地下洞口周围低约束条件下裂缝萌生和扩展的复杂性质，已经采用了连续数值模拟和不连续技术。在本研究中，使用混合有限元方法（FDEM）并将其与使用有限元方法（FEM）的技术进行比较，以研究这些方法在模拟脆性压裂中的效率。数值模型是根据位于加拿大马尼托巴的地下研究实验室（URL）测试隧道的数据和观察结果进行校准的。在对这些模型进行比较之后，通过整合离散裂缝网络（DFN）几何形状进行了其他分析，以检查脆性岩体中节理的显式模拟的效果。结果表明，在这两种情况下，与连续挖掘数值技术的结果相比，FDEM方法都能够捕获高度受损区域（HDZ）和基坑破坏区域（EDZ）。

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