在地下开采矿山,若对岩层移动规律缺少了解,易产生一种错觉,似乎地下一采空,地表就会有塌陷的危险。实际上并不完全如此。譬如,铜官山、水口山和大吉山等矿,有的矿体(脉)或矿段,地下深处被采空后,相应的地表就没有下沉。由岩体力学和采矿实践知道,一个矿体(脉)或矿段被采空之前,尽管原岩体各方面都受力,有时是不等值的,但仍能维持一 Mining in the underground, if the laws of the movement of the formation of the lack of understanding, easy to produce an illusion, it seems that the next underground mining, the surface will have the danger of collapse. This is not exactly true. For example, Tongguanshan, Shuikoushan and Dayishan and other mines, and some ore bodies (veins) or ore sections, underground depths are emptied, the corresponding surface does not sink. Knowing from the mechanics and mining practice of rock mass that before a ore body (vein) or ore section is emptied, although all aspects of the original rock mass are stressed, sometimes unequal, they can still maintain a