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首页> 外文期刊>HYDRO Nepal: Journal of Water, Energy and Environment >Engineering Geological Design of Underground Works for Upper Madi Hydroelectric Project
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Engineering Geological Design of Underground Works for Upper Madi Hydroelectric Project

机译：上马迪水电站地下工程的工程地质设计

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Himalayan geology is termed as one of the youngest tectonic formations in the world. Tunneling in this region is hence complex in nature. The very complex geology in the region offers challenges in stability of even the best located underground structures. Tunneling in weak rock is more challenging in terms of stability and application of support. Moreover, in many occasion, prediction of the rock mass has been done optimistically in most of the underground projects in Nepal. In this paper, predicted versus actual rock mass condition has been compared for two already completed projects. Based on this needed support is calculated by empirical method for the project under investigation and later on verified by numerical analysis using the software Phase2. Stability analysis is also done for both high pressure headrace tunnel and underground surge shaft. Numerical method of analysis has an added advantage over empirical and analytical methods, particularly in complex geometry. The Phase2 code and the Hoek-Brown Failure criterion have been used to determine the state of stress, strength factor and deformations around the periphery and in the tunnel walls. DOI: http://dx.doi.org/10.3126/hn.v9i0.7069 Hydro Nepal Vol.9 July 2011 27-34
机译：喜马拉雅地质学被称为世界上最年轻的构造地层之一。因此，该地区的隧道建设本质上是复杂的。该地区非常复杂的地质甚至为地理位置最优越的地下结构的稳定性提出了挑战。就稳定性和支撑应用而言，在弱岩石中开挖更具挑战性。此外，在许多情况下，尼泊尔的大多数地下项目都对岩体进行了乐观的预测。在本文中，已经比较了两个已经完成的项目的预测与实际岩体条件。在此基础上，通过经验方法为所研究的项目计算出所需的支持，然后使用Phase2软件通过数值分析对其进行验证。还对高压引水隧洞和地下调压井进行了稳定性分析。数值分析方法比经验和分析方法具有更多优势，尤其是在复杂的几何图形中。 Phase2代码和Hoek-Brown破坏准则已用于确定应力状态，强度因子以及隧道周围和隧道壁中的变形状态。 DOI：http://dx.doi.org/10.3126/hn.v9i0.7069 Hydro Nepal Vol.9 July 2011 27-34

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