The paper is on the basis of big thickness, high ductility, bad cavibility of second coal seam in Lingwu mining district, and the fully mechanized top coal caving method is hard to broaden.

• 本论文选题针对灵武矿区二号煤层厚度大、高韧性、冒放性差,综采放顶煤开采工艺难以推广的技术难题展开研究。