高瓦斯超長綜放面瓦斯抽放技術(shù)研究與應(yīng)用
[Abstract]:Because coal seam gas in China has the characteristics of low concentration, low pressure and low permeability, there are three aspects of coal mine gas treatment from source, this coal seam gas treatment, goaf gas treatment and adjacent gas treatment. Due to the advantages of large output, low cost and good benefit, fully mechanized caving mining is widely used in our country, and the following problems such as high gas concentration in goaf caused by the large amount of coal left in goaf are becoming more serious, which not only affect production but also endanger the safety of employees. Gas drainage can fundamentally solve the problem of coal mine gas, and the gas problem in goaf can be solved by changing the ventilation mode, which is an effective method to save cost. Therefore, on the basis of deducing the formula of gas migration and diffusion in coal seam, this paper simulates different drainage time, extraction aperture, suction negative pressure, extraction hole spacing by means of COMSOL Multiphysics numerical simulation software. The influence of surrounding rock pressure on the extraction effect or porosity and permeability to find suitable gas drainage parameters; the influence of different ventilation methods on gas concentration in goaf; the comparison between the height of simulated high drainage roadway and the calculation of theoretical formula, Finally, the monitoring value of engineering practice is compared and studied. The extraction time before 180 days is better than that before 180 days, the extraction aperture is 120 mm, the suction negative pressure is 10 KPA, and the interval between the pumping holes is 5 m. The problem of gas over-limit in upper corner and working face is also solved by changing the ventilation mode. The simulation of gas concentration in goaf determines that the ventilation mode is "Y high drainage roadway". By calculation, the interval of periodic compression is 8.8m-11.7m, the height of falling zone is 11.8m-18.lm, the height of numerical simulation is 15.5 m, the simulated excavation distance of UDEC numerical simulation software is 20m, and the height of three zones is consistent with the formula. In practical application, the maximum value of Kmax is 0.38 and the maximum value of Smx is 2.4 kg/m; gas concentration W < 8m3 / t, which accords with the standard requirement.
【學(xué)位授予單位】:山東科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TD712.6
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