沿空留巷深孔预裂卸压与巷内加强支护协同护巷技术研究

doi:10. 11799/ ce202111008

摘要/Abstract

摘要：

为降低顶板来压对无煤柱开采巷道的影响, 增强巷道稳定性, 解决沿空留巷动压剧烈、支护困难等问题, 提出了深孔预裂卸压与巷内加强支护协同控制技术, 并采用UDEC数值模拟软件系统研究了深孔预裂卸压技术中切顶高度、角度等参数对切顶卸压效果的响应, 分析了巷道加强支护方案对沿空巷道的护巷效果, 同时在陈四楼煤矿2803工作面下巷进行了工业性试验。结果表明: 深孔预裂最佳方案为预裂间距600mm, 预裂高度为17m, 预裂角度为15°; 工业性试验实测分析2803下巷巷道位移均控制在500mm以内, 工作面支架阻力3000~5000kN之间, 卸压后工作面顶板对巷道影响较小。

关键词: 沿空巷道, 深孔预裂, 预裂高度, 预裂角度, 工作阻力

Abstract:

The lengthening of the working face can effectively improve the mine output, but with the growth of the working face, the mine pressure will appear obvious changes, and the difficulty of supporting the working face and two roadway will increase.In order to reduce the influence of roof pressure on the mining roadway without coal pillar and enhance the stability of the roadway, the synergistic control technology of deep hole pre-splitting pressure relief and reinforced support in the roadway is adopted in this paper to study the mechanism of deep hole blasting and reinforced support in the roadway.Using FLAC and UDEC numerical simulation software, the effect of pressure relief by technical parameters of deep hole pre-splitting and the effect of roadway strengthening support scheme were numericaly analyzed, the best roof pre-splitting scheme and roadway strengthening support scheme were determined, and the industrial experiment was carried out in the tunnel under 2803 working face of Chen fourth floor coal mine.The results show that the optimal plan of deep hole pre-splitting is the pre-splitting distance of 600mm, the pre-splitting height of 17m and the pre-splitting Angle of 15°.Industrial tests measured and analyzed the displacement of 2803 lower tunnel is controlled within 500mm, and the resistance of working face support is between 3000kN and 5000kN. After pressure relief, the roof of working face has little influence on the roadway.

中图分类号:

TD353

赵伟. 沿空留巷深孔预裂卸压与巷内加强支护协同护巷技术研究[J]. 煤炭工程, 2021, 53(11): 36-41.

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