问题描述：
英语翻译
摘要：采场和采空区充填接顶是保护矿柱、减少围岩移动与地表下沉,最大限度回收资源的重要方法,它对控制地压活动,维护矿山安全生产有着重要作用,目前采空区充填接顶方法有四种,一是人工接顶、二是自流接顶、三是加压接顶、四是机械设备接顶,在国际地下开采矿山中自流接顶所占比重为70%,基本上地下金属矿山都应用自流的方法进行采空区接顶,因此,通过对自流接顶技术的研究,实现采空区与顶板岩层无缝连接,对有效的控制井下地压活动,保障安全高效的生产能力有着非常重要的意义.
关键词：自流、强制接顶、观测、 流动性、性态、 高位接顶、胶凝材料、凝结时间
问题解答：
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Abstract: the stope and goaf filling roof-contacted is the important methods to protect the tiberium spike, reducing roof strata movement and surface subsidence, utmost recycling resource, and it plays an important role of controlling pressure activities and safeguarding the safety of mining. At present there are four ways of goaf filling roof-contacted , firstly is artificial contact, second is flow automatically contact, third is pressurized contact,fourth is the mechanical equipment contact. The proportion of flow automatically contact is 70% in international underground mines. basically underground metal mine application methods of artesian goaf connect top, therefore, through to pick up their top technology research, to realize the seamless connection goaf and roof strata to effective control downhole pressure activities, safeguard secure and efficient production capacity has a very important significance.
Keywords: artesian, mandatory connect top, observation, liquidity, sexual configuration, exalted receive top, gelled material, setting time
