论文部分内容阅读
为解决坚硬难垮顶板的技术难题,采用深孔预裂爆破与水力压裂技术分别进行工作面初次放顶的工业性对比试验。试验结果表明:深孔预裂爆破技术通过强制放顶的爆落煤岩块基本可以充满支架后的采空区,有效减弱顶板初次来压时的动载冲击作用,避免飓风的形成,但安全性较差,易产生大量有毒有害气体;定向水力压裂技术通过优化施工设计可有效弱化工作面顶板岩层,破坏顶板完整性,使得顶板能够在工作面推进过程中分层分次及时垮落,有效减弱顶板来压对工作面支架的冲击。
In order to solve the technical problem of the hard and frivolous roof, an industrial comparative test was conducted using the pre-cracking blasting and hydraulic fracturing techniques for initial caving of working face. The test results show that the deep-hole pre-splitting blasting technology can fill the post-support gob area through the forced-release blasting coal rock blocks, and effectively reduce the dynamic impact when the roof is first pressed to avoid the formation of the hurricane, but the safety It is easy to produce a large amount of toxic and harmful gases. Directional hydraulic fracturing technology can effectively weaken the roof rock strata of the working face and destroy the integrity of the roof by optimizing the construction design, so that the roof can collapse in time and in different layers in time, Effectively reduce the impact of the roof to pressure on the support surface.