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基于受高速射流冲击的水垫塘中掺气对岩块稳定性影响的系统试验研究,本文给出了一种基于物理特性冲刷模型的适应性研究成果。在综合冲刷模型中实现了对射流掺气模型的改进,使其得以再现有关冲刷形成的物理–机械过程,其中涉及三相,即水、岩体和空气。改进方法考虑了因挟带气泡引起的掺气射流动量减少以及射流扩散剪切层的能量消耗。岩块从岩体脱离取决于掺气的时均压强系数及修正的最大动力冲击系数的组合,对于深水垫塘中的高速射流,该系数为定值0.2。上述改进模型的模拟结果与卡里巴大坝冲坑原型观测结果吻合良好。
Based on the systematic experimental study on the influence of aeration on the stability of rock mass under the impact of high-speed jet impounding, this paper presents an adaptability research result based on the scouring model of physical properties. In the integrated erosion model, improvements have been made to the jet aeration model, allowing it to reproduce the physical-mechanical processes involved in the formation of scour, involving three phases, namely water, rock mass and air. The improved method takes into account the reduction of the entrained jet momentum due to bubble entrainment and the energy consumption of the jet-spreading shear layer. The detachment of the rock mass from the rock mass depends on a combination of the time-averaged pressure coefficient of aeration and the corrected maximum dynamic impact coefficient, which is a fixed value of 0.2 for high-velocity jets in a deep-water cushion pond. The simulation results of the above improved model are in good agreement with the prototype observations of kariba dam.