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1.序言 下沉现象的几何描述在大多数情况下是用来表示水平矿层的简明范例。 如图1所示,在次临界采动时,地表上的一个点产生相对最大下沉S_(max相对);它小于绝对最大下沉S_(max绝对)。当采区达到临界采动时,就出现绝对最大下沉S_(max绝对)=S_(max相对)的情况。当采区面积足够大,即超临界采动时,地表出现一个下沉量处处为S_(max绝对)的平底。在水平矿层时,次临界采动、临界采动及超临界采动这三种情况的范
1. Introduction The geometric description of sinking phenomena is in most cases a concise example of a horizontal seam. As shown in Figure 1, at sub-critical mining, a point on the surface produces a relative maximum subsidence, S_ (max relative); it is less than the absolute maximum subsidence S_ (max absolute). When the mining area reaches the critical mining, the absolute maximum sink S_ (max absolute) = S_ (max relative) situation. When the mining area is large enough, that is supercritical mining, the surface appears a subsidence everywhere S_ (max absolute) flat bottom. In the horizontal seam, sub-critical mining, critical mining and supercritical mining these three cases of Fan