露天转地下开采覆盖层形成泥石流原因的研究

Study on Debris Flow Forming Reasons in Overburden Layer During Transition Mining from Open Pit Mine to Underground Mine

我国许多露天转地下开采的矿山均面临一个共同的问题,即覆盖层的安全问题。通过相似材料的物理模型试验,得出了覆盖层散体是泥石流形成的原因。随着矿体的放出,覆盖层中内部结构发生变化,即覆盖层中小块的颗粒要比大块的颗粒移动的快,使得颗粒间随覆盖层深度的增加越来越致密,渗透系数越来越小,当覆盖层承受不了散体中的水的压力时,会产生突发性的泥石流。

In our country, many mines face a problem during transition mining from an open pit mine to an underground mine, i.e. safety of overburden layer. It found out that the reason to form debris flow was loose material in overburden through the physical model test of similar materials. With drawing - out of ore body, the internal structure of overburden would change, i.e. small particles moved faster than big particles in the overburden. It resulted in increasingly denser between particles with depth of overburden increased, and permeability coefficient was becoming smaller. When the loose material in overburden could not bear the pressure of water, the debris flow would occur suddenly.