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陕西省渭北煤田四个矿区约60～70%的回采工作面底板为软底板。实践证明,在软底板条件下,综采支架移架困难,单体支柱很难发挥支撑能力,甚至有的支柱在没有达到初撑力之前,支柱已钻入底板。随着顶板来压,支柱钻底速度加快,导致顶板下沉过大、破碎加剧而出现顶板事故。因此,研究支柱与底板的相互作用关系,以及回采工作面底板的抗压入特性,进而对底板进行分类,为单体支柱底座选型、自移支架的优化设计提供科学依据就显得十分重要。陕西省煤炭科学研究所在1990年承担了“渭北煤田主采煤层底板抗压入特性分类研究”课题。经过近两年的工作,在有关方面
About 60 ~ 70% of the mining face of the four mining areas in Weibei Coalfield in Shaanxi Province are soft floor. Practice has proved that under the condition of soft floor, it is difficult for the fully mechanized mining support to move the supporter, and it is difficult for the single supporter to exert its supporting ability. Even some pillars have been drilled into the bottom plate before the initial support force is reached. With the roof to pressure, the pillar drill bottom speed, leading to the roof sinking too large, broken and increased roof accident. Therefore, it is very important to study the interaction between pillars and base plate, and the anti-pressure-in characteristics of bottom plate in mining face, and then to classify the base plate. It is very important to provide a scientific basis for optimizing the design of single-pillar base. Shaanxi Provincial Institute of Coal Science in 1990 assumed the “Weibei coal seam main coal seam floor pressure into the characteristics of classification” issue. After nearly two years of work, in the relevant area