【摘要】 本文介绍了超前深孔预爆破处理坚硬顶板的原理及设计方法 ,对施工中常见几个难题给出处理意见 ,并简述了工作面处理后的效果。更多还原

【Abstract】 The paper introduces the principle and design method of using advanced deep hole pre blasting to deal with hard roof. Some common problems during construction are settled and settling results of the coal face are also summarized.更多还原