黄土沟壑地貌下综放开采覆岩结构稳定性研究
Study on stability of overlying rock structure in fully mechanized top coal caving mining under loess gully landform
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摘要: 针对王家岭煤矿在黄土沟壑地貌下开采矿压显现特征明显等情况，采用Get Data软件提取回采范围内的高程数据，采用Surfer进行数据处理，构建黄土沟壑三维地貌；基于数值模拟技术研究了黄土沟壑地貌对综放开采覆岩结构稳定性的影响。结果表明：黄土沟壑地貌对采区原岩应力影响显著，随着采深的增加，其影响逐渐减小，表明浅部原岩应力主要受到黄土沟壑地貌的影响，而深部原岩应力主要与岩层埋深有关；黄土沟壑地貌影响下，随着开采工作面的推进，上覆岩层受到的作用力越来越大，关键层开始失稳破断，采空区下沉最严重的拱形区域持续滞后于空区几何中部位置，工作面超前支承压力集中程度受上覆黄土层厚度影响明显。Abstract: In view of the obvious characteristics of mining pressure in Wangjialing Coal Mine under the loess gully landform, the Get Data software was used to extract the elevation data within the mining range, and Surfer was used to process the data to construct the loess gully three-dimensional landform; based on numerical simulation technology, the influence of loess gully landform on the stability of overburden structure in fully mechanized top coal caving mining was studied. The results show that the loess gully landform has a significant effect on the original rock stress in the mining area, and the effect gradually decreases with the increase of mining depth; it shows that the shallow original rock stress is mainly affected by the loess gully landform, and the deep original rock stress is mainly related to the buried depth of rock strata. Under the influence of loess gully landform, with the advance of mining face, the overlying strata are subjected to more and more force, the key strata begin to lose stability and fracture, the arch area with the most serious subsidence of goaf continues to lag behind the geometric middle of goaf, and the concentration degree of advance abutment pressure of working face is obviously affected by the thickness of overlying loess layer.
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