论文部分内容阅读
许多大型高速远程滑坡在近程活动阶段呈现凌空飞行运动,其飞行过程必须考虑空气动力学效应和地面效应,但是直接求解高速滑体凌空飞行运动的偏微分方程是困难的。因此,以往的研究只给出了定性分析或粗略的计算结果。本文将以头寨沟滑坡为例,使用数值模拟方法研究高速滑体凌空飞行的运动规律。结果表明,高速滑体凌空飞行时空气动力效应更多地表现为对滑体的抬升作用;高速滑体因空气动力效应的影响而产生不断增大的水平推力和竖向抬升力,使得水平加速度不断增大,竖向加速度不断减小,导致滑体的水平速度不断增大,而竖向速度则趋于稳定值,当水平速度远超过竖向速度时,滑体的飞行姿态将接近于平行于地面。因此,与不考虑空气动力学效应的情况相比,高速滑体凌空飞行时间更长,飞行距离更远,更加符合滑坡的实际情况。
Many large-scale high-speed long-range landslides present volley during the short-range activities. The aerodynamic and ground effects must be considered in the flight process. However, it is difficult to directly solve the PDE of high-speed ballooning. Therefore, previous studies only give qualitative analysis or rough calculation results. In this paper, taking the headhunter landslide as an example, the numerical simulation method is used to study the law of motion of high-speed slide volley. The results show that the aerodynamic effect of the high-speed slide volley flight is more as the lifting effect on the sliding body; the high-speed sliding body generates the increasing horizontal thrust and vertical lifting force due to the aerodynamic effect, so that the horizontal acceleration Increasing, the vertical acceleration decreases, leading to the continuous increase of the speed of the slippery body, while the vertical speed tends to be stable, when the horizontal speed far exceeds the vertical speed, the slippery attitude of the flight will be close to parallel On the ground. Therefore, compared with the case without considering the aerodynamic effect, the high-speed slide volley flight longer, longer flight distance, more in line with the actual situation of the landslide.