Building a three dimensional sealed geological model to use in numerical stress analysis software: A case study for a dam site |
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Authors: | Nengxiong Xu Hong Tian Pinnaduwa HSW Kulatilake Qingwei Duan |
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Institution: | 1. School of Engineering & Technology of China University of Geosciences, Beijing 100083, China;2. Department of Geotechnical Engineering, RWTH Aachen University, Aachen 152074, Germany;3. Department of Materials Science & Engineering, University of Arizona, Tucson, AZ 85721, USA;4. China Institute of Water Resources and Hydropower Research, Beijing 100038, China |
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Abstract: | The dam area of the SUOXI hydropower project shows high terrain undulation and complex geological conditions, containing 6 faults and 7 weak inter-beds. A geometric model developed to represent the geology and engineering structures should incorporate the geological realities and should allow suitable mesh generation to perform numerical stress analysis. This is an important precondition to perform rock mass stability analysis of a dam foundation based on a numerical stress analysis software such as FLAC3D. Using the modeling tools available in FLAC3D, it is difficult to construct a complex geological model even after performing a large amount of plotting and data analyses. The 3-D geological modeling technique suggested in this paper, named as Sealed Geological Modeling (SGM), is a powerful tool for constructing complex geological models for rock engineering projects that require numerical stress analysis. Applying this technique, first, the geological interfaces are constructed for the dam area of SUOXI hydropower project using various interpolation procedures including geostatistical techniques. Then a unitary wire frame is constructed and the interfaces are connected seamlessly. As the next step, a block tracing technique is used to build a geological model that consists of 130 seamlessly connected blocks. Finally, based on the Advancing Front Technique (AFT), each block is discretized into tetrahedrons and a mesh is generated including 57,661 nodes and 215,471 tetrahedrons which is suitable to perform numerical stress analysis using FLAC3D. |
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Keywords: | 3-D geological modeling Sealed model Numerical stress analysis Wire frame Block tracing Tetrahedral mesh generation |
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