浅埋特厚煤层综放面支架合理工作阻力研究

Research on support resistance in fully-mechanized top coal caving working face in ultra-thick seam with shallow depth

在浅埋特厚煤层综放开采覆岩运移特征的基础上,提出基于控顶效果及工作面支架来压超限比例的工作阻力反演优化法。具体为统计4个工作面支架工作阻力指标,即:额定阻力、均值阻力、均值偏阻力和均值上阻力,考虑2个评判标准—控顶效果与支架压力超限比重来确定工作面合理的工作阻力,基于核算的工作面阻力,采用类比法设计相邻工作面的合理工作阻力,结合现场监测对支架工作阻力进行反馈及修正。金地煤矿1322工作面支架工作阻力监测数据表明:修正后相邻工作面液压支架在来压期间,其工作阻力值是核算的额定工作阻力值的80%~90%;液压支架工作良好,并未出现立柱收缩或压架等现象。

Based on the overburden movement features of a fully-mechanized top coal caving working face in an ultra-thick seam with the shallow depth, an optimized and inversion method to calculate the support resistance was put forward by considering the roof control effect and shield＇s overrun percent- age. The four support working resistance indexes, which are the rated working resistance, the average working resistance, the average-partial working resistance and the average-upper working resistance is counted. The final resistance was decided by the following two judgment criteria： the roof control effect and shield＇s overrun percentage. Based on the caclculated working resistances, the adjacent face working resistance can be obtained by using such method. Combining the field monitoring data, the working resistance was amended. The monitor data of No.1322 working face in the Jindi coal mine show that the amend working resistance is 80%-90% of calculated rated working resistance. The hydraulic support is worked under a good condition. There is no pillar shrinkage or shield crushing accidents during coal mining.