察哈素煤矿工作面顶板岩性变化对矿压规律的影响研究

针对工作面走向长度不断加大、顶板岩性变化剧烈的情况，有必要研究其对工作面矿压分布规律的影响。采用理论分析、支架工作阻力和宏观矿压显现监测的方法，研究了工作面不同阶段周期来压步距、支架来压判据限和煤壁片帮、冒顶等参数的差异，进而获得了不同顶板岩性对工作面矿压分布规律的影响:顶板岩层中存在坚硬基本顶时支架来压判据限和周期来压步距要大于存在软弱基本顶的工作面，且周期来压步距不仅和强度有关，而且也和顶板岩层厚度有关；另外，工作面直接顶厚度增大会减缓支架的工作阻力强度变化；基本顶的强度较高且厚度较大时，宏观矿压显现也较强烈。

Effects Study on Roof Changes of Working Face on Strata Pressure Distribution in Chahasu Mine

Base on the trend of the growing strike length of working face and the dramatic changes of roof conditions，it′s necessary to study the influences of this trend on the strata pressure distribution. Using the method of theory analysis，the prospecting method of the support working resistance observation and the mine pressure behavior，differences of the factors such as periodic weighting length，the limit of support weighting and side fall roof caving among different stages were analysed，so the effect of roof changes on strata pressure distribution were obtained: the limit of support weighting and periodic weighting length of roof in which exists hard main roof are bigger than roof in which exists soft main roof，what′s more，periodic weighting length is associated with not only strength of the main roof，but also the height of the main roof，besides，the increase of the height of immediate roof will relief the changes of support working resistance，if the height and strength of the main roof are high，the mine pressure behavior will become cute.