围岩卸载时紧靠煤层表面区域的能量计算

• 作 者: V.N.阿诺卡科 张延涛
• 出 处: 河南煤炭
• 发表日期: 1984年02期
• 关键词: 能量计算 最终状态 岩石压力 工作区 动力现象 煤壁 应力状态 应力分量 煤与瓦斯突出 相对位移

众所周知,开采易突出煤层时,常常伴随着由于工作面附近围岩状态的迅速改变而发生的动力现象。可以断言,这种动力现象是由紧靠煤层表面区域中积聚能量的转化所导致的。这种能量的转化是岩石压力和煤层中的瓦斯二者作用的结果。在这篇文章中,对处于卸载状态的煤层部分,我们计算从初始状态换转到最终状态外力所做的功以及它总的能量的变化。通过外力所做的功与总能量变化的对比,可以得出煤壁附近的突出速度。这种分析是基于这样一种概念,即围岩的卸载总是伴随着发生围岩的会聚(即顶底板的相对位移——译者)和煤层向工作区的迅速突出。

It is well-known that the exploitation of easily-outburst coal seams is often accompanied by the dynamic phenomena that occur as a result of rapid changes in the rock mass surrounding the face. It can be asserted that this dynamic phenomenon is caused by the conversion of accumulated energy in the immediate vicinity of the surface of the coal seam. This conversion of energy is the result of both the rock pressure and the gas in the coal seam. In this article, we calculate the work done by the external force transferred from the initial state to the final state and the change of its total energy for the coal section in the unloaded state. Comparing the work done by external forces with the change in total energy, we can draw the prominent speed near the coal wall. This analysis is based on the notion that the unloading of surrounding rock is always accompanied by the occurrence of the surrounding rock mass (ie, the relative displacement of the top floor) and the rapid prominence of the coal seam to the work area.