基于连续块体理论的土石坝边坡破坏过程研究
发布时间：2018-10-11 19:21
【摘要】：在我国有相当一部分中小土石坝由于年久失修，地质水文条件变化等因素作用下经常发生坝坡滑塌现象，，对土石坝附近区域人民生命财产安全造成影响。对于那些肩负下游人民生命财产安全的土石坝，仅靠设计规范中采用的抗滑稳定计算方法来控制坝体稳定是不够的，还需要找出一种方法来对将来由于各种因素变化而可能会发生的滑坡事故作出远期预测与灾害评估,以便作好相应补救措施。 文章主要是依据国内外滑坡建模计算的研究成果，基于能量守恒理论建立一种模拟滑坡破坏过程的一种连续块体方法。该理论与一般连续块体理论相比，前者是从能量守恒角度出发，不仅考虑了动能势能的转化，还考虑了摩擦以及形变所带来的能量的损耗。比起仅考虑动能与势能转化的块体连续理论，前者的考虑因素更全面，适用范围更加广泛。文章首先阐述了一种基于能量观点的连续块体理论的详细内容，然后将该理论应用于理论模型与实际模型两种模型上，把得到的模拟结果与实际结果进行对比来证明理论与算法程序的准确性。最后再将该理论应用于一个土石坝滑坡实例中，通过改变填土的土性参数与坝前水位构成不同工况组合，进而研究不同工况下土石坝边坡破坏过程与破坏机理。
[Abstract]:In China, a considerable number of small and medium-sized earth and rockfill dams often collapse under the influence of factors such as old disrepair and changes in geological and hydrological conditions, which have an impact on the safety of people's lives and property in the area near the earth and rock dams. For earth-rock dams that shoulder the safety of people's lives and property downstream, it is not enough to rely on the calculation method of anti-slide stability used in the design code to control the stability of the dam body. It is also necessary to find a way to make long-term prediction and disaster assessment of landslide accidents which may occur due to various factors in the future in order to make corresponding remedial measures. Based on the research results of landslide modeling and calculation at home and abroad and based on energy conservation theory, a continuous block method for simulating landslide failure process is established in this paper. Compared with the general continuous block theory, the former is based on the conservation of energy, considering not only the transformation of kinetic energy potential energy, but also the energy loss caused by friction and deformation. Compared with the block continuity theory which only considers kinetic energy and potential energy transformation, the former has more comprehensive factors and wider application range. In this paper, the detailed contents of a continuous block theory based on energy viewpoint are introduced, and then the theory is applied to both theoretical model and practical model. The simulation results are compared with the actual results to prove the accuracy of the theory and the algorithm program. Finally, the theory is applied to an example of earth-rockfill dam landslide. The failure process and failure mechanism of earth-rock dam slope under different working conditions are studied by changing the soil property parameters of the fill soil and the different working conditions of water level in front of the dam.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV641;TV223
本文编号：2264971
[Abstract]:In China, a considerable number of small and medium-sized earth and rockfill dams often collapse under the influence of factors such as old disrepair and changes in geological and hydrological conditions, which have an impact on the safety of people's lives and property in the area near the earth and rock dams. For earth-rock dams that shoulder the safety of people's lives and property downstream, it is not enough to rely on the calculation method of anti-slide stability used in the design code to control the stability of the dam body. It is also necessary to find a way to make long-term prediction and disaster assessment of landslide accidents which may occur due to various factors in the future in order to make corresponding remedial measures. Based on the research results of landslide modeling and calculation at home and abroad and based on energy conservation theory, a continuous block method for simulating landslide failure process is established in this paper. Compared with the general continuous block theory, the former is based on the conservation of energy, considering not only the transformation of kinetic energy potential energy, but also the energy loss caused by friction and deformation. Compared with the block continuity theory which only considers kinetic energy and potential energy transformation, the former has more comprehensive factors and wider application range. In this paper, the detailed contents of a continuous block theory based on energy viewpoint are introduced, and then the theory is applied to both theoretical model and practical model. The simulation results are compared with the actual results to prove the accuracy of the theory and the algorithm program. Finally, the theory is applied to an example of earth-rockfill dam landslide. The failure process and failure mechanism of earth-rock dam slope under different working conditions are studied by changing the soil property parameters of the fill soil and the different working conditions of water level in front of the dam.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV641;TV223
【参考文献】
相关期刊论文 前3条
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本文编号：2264971
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