浅埋深极松软顶板采场矿压显现规律研究

分析了印度PVK矿Queen煤层开采的采场矿压显现规律。浅埋深极松软顶板难以形成“梁”或“板”结构，随着开采，将形成“压力拱”结构：当采场推进到一定距离时，拱结构失稳破坏，产生初次来压；当拱顶高度接近地表时，压力拱主结构内岩体失稳破坏，引起工作面更剧烈来压，同时，拱外次结构内岩体随之破坏，引起地表下沉：压力拱结构周期性失稳并前移，引起工作面周期来压。研究结果合理解释了项板极其松软、矿山压力显现且相当剧烈的现象，对国内类似开采条件下的矿压显现规律研究可资参考。

Study on Regularity of Structural Behaviours Around Coal Face Under the Shallow-Buried Loose Roof

The regularity of strata pressure around coal face in Queen seam of PVK colliery in India is analyzed. It has shown that the pressure arch,rather than the beam or plate,can be formed under the shallow-buried and very loose roof. When coal face reaches a certain distance,the pressure arch is destroyed and the initial weighting occurs. When the arch vault is close to ground surface,the rock mass of the key structure inside pressure arch is destroyed and more fierce pressure occurs. Subsequently,the rock mass of the subordinate structure outside the pressure arch is destroyed followed by surface subsidence. The periodic destruction and advancement of arch structure cause the occurrence of periodic pressure. The result reasonably explains the phenomenon that the behavior of ground pressure is very strong even under the very loose roof and can be referred for further studies in similar conditions.