不同工作面长度对采场覆岩的影响分析

Analysis about Influence of Different Working Face Length on Overburden Strata

针对某采煤工作面的覆岩结构特点,在收集相关资料的基础上,运用FLAC3D软件对该工作面矿压显现规律进行了研究,分析在相同采高、不同工作面长度的条件下顶板上覆岩层的应力、位移及塑性区分布规律。随着工作面长度和推进距离的增加,工作面覆岩支承压力峰值逐渐变大,至工作面中线距离越远,支承压力峰值越低。整个应力壳壳体高度以及高应力区的分布范围变大,扁平率升高。工作面长度增加,顶板下沉量增大,工作面上覆岩层越易破坏。

Based on the characteristics of the overlying strata of a coal mining face and the collection of the relevant information of it, uses the software FLAC3 Dto study the law and the control mechanism of this near shallow seam′ s mining pressure. Analyzes the stress distribution, displacement in vertical direction and plastic zones in the roofs of the mining work face which were in a same height but different length. With the increase of face length and advancing distance, the peak pressure of abutment pressure of the working face becomes larger gradually, and the farther the distance to the midline of the working face is, the lower the peak abutment pressure. Meanwhile, the height of the stress shell and the distribution range of the high stress area are increased, and the flat ratio is also increased. The length increasing of the working face leads to the increasing of roof subsidence, the overlying strata on the working face are more likely to be destroyed.