弓长岭露天铁矿采空区稳定性及预警研究

摘要

The goaf is a great risk to work safety in open-pit mine.The stability of many proved goaf in Gongchangling open-pit mine were analyzed .By monitoring the blasting vibration produced by the daily blasting op-eration in open-pit mine, the parameters of Sadov's empirical formula were obtained by statistical regression , and the loading of blasting vibration on the goaf was obtained .The mechanical model of three hinged arch bearing for the goaf roof was established , and the criterion of roof stability for the goaf was deduced .The stability of arch goaf under different loading were calculated by using numerical simulation method , and the warning on proved goaf in Gongchangling open-pit iron mine were conducted .It provides basis for the dispose of goaf and work safety in Gongchangling open-pit mine.%采空区对露天矿的安全生产具有极大的威胁。针对弓长岭露天矿众多已探明的采空区进行了稳定性分析。对露天矿日常的爆破作业进行了爆破测振，统计回归出萨道夫斯基经验公式参数，获得了爆破振动对空区产生的荷载。建立了采空区顶板三铰拱承载的力学模型，推导了空区顶板稳定性的判据。利用数值模拟方法，计算拱形空区在不同荷载作用下稳定性，对弓长岭露天铁矿已探明各空区进行了预警，为弓长岭露天矿处理空区及安全生产提供依据。