基于地理信息系统的大倾角煤层飞矸运移研究

Research on Migration of Flying Gangue Based on Geographic Information System in Steeply Dipping Coal Seam

针对大倾角煤层工作面底板的不规则性和飞矸形状的多样性,利用工作面底板等高线等地理信息系统数据建立真实工作面底板三维网格模型,结合能量跟踪法(ETM)自编C++程序,模拟得到相同质量不同形状的四类典型形状飞矸在实际工作面运移的运动轨迹,以及任意时刻的线速度、角速度和能量变化曲线,分析了形状对飞矸运移规律的影响。为验证本文方法的准确性和可行性,与采用Rockyfor3D软件模拟的轨迹进行了对比。结果表明,椭球体飞矸的运移能力远大于多面体飞矸;正多面体飞矸比一般多面体飞矸运移距离更远,碰撞的能量损失更小;正多面体飞矸的棱边数与飞矸在碰撞中的能量损失量成反比,多棱边正多面体飞矸造成危险的可能性最大。

In view of the irregularity of the bottom floor of working face and the diversity of the shape of the flying gangue in steeply dipping coal seam,based on the geographic information system data such as contour line of bottom floor of working face,the 3d grid model of bottom floor is established,combined with the energy tracking method(ETM)C++programs,four typical shapes of flying gangue with the same mass and different shapes are simulated to obtain the motion trajectories of the migration of flying gangue in the actual working face,as well as the velocity,angular velocity and energy change curves at any time.The influence of the shapes on the motion of flying gangue is analyzed.In order to verify the accuracy and feasibility of the method in this paper,the trajectory simulated by Rockyfor3D software is compared.The results show that the transport capacity of ellipsoidal flying gangue is much higher than that of polyhedral flying gangue.Compared with common polyhedral flying gangue,the regular polyhedral flying gangue has farther migration distance and less energy loss due to collision.The number of edges of flying gangue of regular polyhedron is inversely proportional to the energy loss of flying gangue in collision,which indicates that flying gangue of regular polyhedron with multiple edges is most likely to cause danger.