放顶煤长壁开采浅覆岩结构与变形研究

采用全景式钻孔摄影技术可以反映地层特征,地震CT扫描仪能较好地反映井间地层特征,两种技术方法相结合研究长壁开采在浅层综采工作面中覆岩层的变形破坏规律。结果表明,可以有效地确定破碎带和崩落带的高度。最后通过实测验证得到顶端深度为171 m,破碎带深度106-110 m之间,研究结果可作为控制浅埋放顶煤盘区覆岩的依据。

采煤工作面放煤工艺参数的优化模拟研究

为解决大倾角厚煤层开采时由于采煤工艺参数不合理所导致的单产率低、回采周期长以及搬家频繁的问题,以21051综采工作面为例在对其煤层、地质条件等进行综合分析的基础上,基于PF2CD软件构建了数值模拟仿真模型对不同开采工艺下的工作参数进行分析,为21051综采工作面的实际开采奠定了扎实的基础。

Analysis of main roof breaking form and its mechanism during first weightingin longwall face

By field observation and simulating test in shallow seam longwall mining, the asymmetry breaking of main roof is discovered during the first weighting. Based on simulating model test and theoretical analysis, the mechanism of main roof first breaking is revealed, and the asymmetry breaking parameter is determined at all.