| 摘要: |
| 针对岩体中主干裂隙和网络状裂隙提出了耦合渗流数值模型模拟分析岩体地下水三维渗流的方法。使用离散介质渗流模型描述岩体主干裂隙中的水运动，使用连续介质渗流模型描述网络状裂隙中水运动。连续介质充满整个研究域，离散介质按主干裂隙的实际空间分布嵌入连续介质中，并依据裂隙壁水力条件耦合两者。该方法逐个计算主干裂隙的渗流，充分体现主干裂隙的特殊水力作用；同时又避免了逐个计算网络状裂隙中的渗流所带来的困难，可以在较大尺度上分析渗流，便于工程应用。理论例子显示它能比较客观地反映裂隙岩体的渗流特性。该方法被应用到乌江构皮滩水利枢纽岩体渗流的分析中。 |
| 关键词: 主干裂隙,网络状裂隙,耦合渗流模型,水利枢纽,泄洪 |
| DOI： |
| 分类号:TV139.14 |
| 基金项目:国家自然科学基金!59779014 |
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| A coupled model for numerical analysis of ground water flow in a fractured rock mass and its engineering application |
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Wang Hongtao, Wang Enzhi, Jin Yiying
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| Abstract: |
| An approach for the analysis of three dimensional ground water transient flow in a fractured rock mass is presented. Flow in the dominant fracture system is described by a distinct medium model, while flow in the network fracture system is described by a continuous medium model, and the two models are coupled together by hydraulic head and flux.It is assumed that the continuous medium occupies the entire studied domain, and the distinct medium is embedded into the continuous medium according to the spatial distribution of the dominant fractures. The coupled model calculated one-by-one the fluid flow in the dominant fractures which are functioned as the major water transport conduits, and it avoids unnecessary calculating fluid flow in individual network fractures which are numerous in number. In this way, the method can be applied to a large-sized calculation domain.Theoretical calibration results show that the coupled model can better reveal the flow properties of ground water in a fractured rock mass. Case study of the model in Wujiang Goupitan hydropower project for the calibration of ground water flow in the carbonate rock mass indicates that the method presented is practical and effective. |
| Key words: dominant fracture, network fracture, coupled seepage model, hydropower project, flood discharge |
