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在省厅和各局矿的重视下,陕四省主要矿区近年来曾对30个回采工作面进行了矿山压力观测,正确地认识和恰当地分析这些观测结果,对进一步改善顶板管理有十分重要的意义。一、陕西主要矿区不同类型的顶板普遍存在有老顶来压现象按传统观点,只有在直接顶不能充填满采空区,其上赋存有竖硬岩层组成的老顶时,工作面才有较明显的周期来压现象。我国现行的顶板分类方案,就是以直接顶厚度是否超过采高的3～5倍,作为判定有无老顶影响的依据。而陕西主要矿区矿压观测表明,不仅在有老顶的工作面,如韩城桑树坪煤矿的11号煤层开采中有老顶来压,而且在没有老顶的各类组构顶板的工作面,也有明显的周期性矿压显现。
Under the attention of the ministries and commissions and the ministries and commissions, the mine pressure in 30 mining faces has been surveyed in major mining areas in Shaanxi Province in recent years. Correctly understanding and properly analyzing these observations is of great importance to the further improvement of roof management significance. First, the main mining areas in different types of top roof prevail in the United States to suppress the phenomenon of the old top According to the traditional view, only in the direct top can not be filled with goaf, on which there is the existence of vertical top layer of hard rock, the face only The more obvious cycle to suppress the phenomenon. The current roof classification scheme in our country is based on whether the direct top thickness exceeds 3 to 5 times of the mining height, as the basis for judging whether the old roof affects or not. However, the observation of rock pressure in the main mining areas in Shaanxi shows that there is not only the old top pressure in the coal mining with No. 11 coal seam of the old top face, such as the Hancheng Sangshuping coal mine, but also the working face , There are also obvious periodic pressure show.