a - Chiementin, Xavier AU - Yang, Shengli AU - Yue, Hao AU - Song, gao - feng AU - Wang, Junjie AU - Ma, yan - yao AU - Liu，Fengqi PY - 2021 DA - 2021/02/10 TI - 3 d实体造型Shield-Strata交互屋顶动态加载条件下研究SP - 6618954六世- 2021 AB -动态危害开放面临地区造成巨大的冲击载荷强屋顶成为日益严重的增加减少长壁表面及其高度depth of cover. Understanding the strata-shield interaction under the dynamic impact loading condition may relieve the dynamic hazards. In this paper, a 3D physical modelling platform is developed to study the interaction between the roof strata and the longwall shield under the dynamic impact load conditions. A steel plate is dropped to the coal face wall at a certain height above the immediate roof to simulate the free fall of the main roof and the dynamic impact loading environment. The occurrence of major roof falls is modelled at different height above the model and at different positions relative to the longwall faceline. The large-cutting-height and top-coal-caving mining methods are modelled in the study to include the nature of the immediate roof. The results show that the level of face and roof failures depends on the magnitude of the dynamic impact load. The position and height of the roof fall have an important influence to the stability of the roof and face. The pressures on the shield and the solid coal face are relieved for the top-coal-caving face as compared to the large-cutting-height face. SN - 1070-9622 UR - https://doi.org/10.1155/2021/6618954 DO - 10.1155/2021/6618954 JF - Shock and Vibration PB - Hindawi KW - ER -