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针对高速滑坡超前气浪灾害的动力学问题,建立了滑坡体沿坡面滑动的二维模型;采用动网格技术,数值仿真了高速滑坡超前冲击气浪的流场特征,分析了其形成的动力学机理。计算结果表明:随着滑坡体下滑速度增大,在滑坡体前缘上方和滑坡体后方出现的涡流逐渐加强,速度也逐渐变大;滑坡体下滑速度越大,在滑坡体正前方不同高度处的气浪速度越大,气浪所影响的距离越远,所造成的破坏也越大。在滑坡体正前方出现高压区,并且随着滑坡体下滑速度增大,滑坡体前方的压力变化也增大,压力的急剧增大也导致气浪速度变大。高速滑坡引发的冲击气浪在前方100m范围内产生12级以上的大风,破坏力极大。此研究将为超前气浪灾害的防治提供科学依据。
Aiming at the dynamic problem of high-speed landslide leading to air-wave disasters, a two-dimensional model of landslide sliding along the slope is established. By using the moving grid technique, the flow field characteristics of the advanced impact landslide are simulated numerically. Kinetic mechanism. The results show that with the slip velocity of the landslide increasing, the eddy currents appearing above the front edge of the landslide body and behind the landslide body gradually strengthen, and the velocities also gradually increase. The greater the slip velocity of the landslide body, The greater the speed of the air waves, the farther the air waves affect the greater the damage caused. The high-pressure zone appears in front of the landslide body, and as the landslide body sliding speed increases, the pressure change in front of the landslide body also increases, and the sharp increase of pressure also causes the air-wave speed to increase. The impact of high-speed landslide wave in the front of the 100m range of 12 or more winds, great destructive power. This research will provide a scientific basis for the prevention and treatment of the advance of the air-wave disaster.