【摘要】 通过对单体支柱、π型梁放顶煤一次采全高技术的开采试验 ,分析研究了在三软极不稳定煤层条件下 ,普通放顶煤开采工作面的矿压显现规律 ,合理的支护方式及支护参数。实践证明在三软极不稳定煤层中 ,单体支柱放顶煤一次采全高是一种与之相适应的高产高效开采技术。更多还原

【Abstract】 Based on mining tests on the prop and?π pattern girder caving method with full shear height, analysis and studies the ground behavior regularity of conventional caving method coal face on soft seam with soft surrounding and extremely unstable seam have been performed. Experiment and study the appropriate support patterns and support parameters have been carried out. Practice and study has confirmed that the prop caving method with full shear height on soft seam with soft surrounding and extremely unstable soft seam is an adapted mining technique with high output and high efficiency.更多还原