【摘要】 为提高掘进效率,姚桥煤矿在7704综放工作面材料道试用了高预紧长锚固低密度支护技术,顶板采用单一柔性锚杆支护,锚杆排距放大到1. 2 m。监测表明,顶板总体控制效果理想,围岩内部裂隙控制到浅部,顶板较平整。2019年3月份在7703材料道采用此技术掘进进尺616 m,达到近年来历史最好水平。更多还原

【Abstract】 The low-density support technology with high pre-tightening long anchorage is applied in haul road at 7704 working face of Yaoqiao Colliery, in which roof is supported by single flexible bolt with row distance of 1.2 m. The test results show the roof is controlled remarkably with shallow internal fracture of surrounding rock and flat roof.更多还原