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为了研究突出通道渗透性对突出强度的影响规律,研制了试验装置,进行了密闭门、反滤层、金属栅栏及巷道无障碍4种揭煤试验。煤样的粒径小于4.75 mm,经15 MPa的压力压实,煤样室的内径为199 mm,煤样室总长度为1 000 mm。试验气体为N2,注气压力为0.40 MPa。采用球阀作为揭煤装置,球阀孔径为40 mm。揭煤时未对煤样施加轴向压力。试验结果表明:突出强度随突出通道渗透性的增加而增大;突出是一个由外向内发展,然后由空洞中心向四周扩展的过程;在突出的末期,随着气压梯度的降低,失稳分层厚度增大。提出将密闭门、反滤层和金属栅栏配合使用的揭煤建议。
In order to study the influence of prominent channel permeability on protruding strength, a test device was developed, and four kinds of uncovering tests on airtight doors, anti-filtration layers, metal fences and roadways were conducted. The particle size of the coal sample is less than 4.75 mm, compacted at a pressure of 15 MPa, the internal diameter of the coal sample chamber is 199 mm, and the total length of the coal sample chamber is 1 000 mm. The test gas is N2 and the injection pressure is 0.40 MPa. Ball valve is used as a coal uncover device, the ball valve aperture is 40 mm. Coal unburied when the axial load imposed on the sample. The experimental results show that the protruding strength increases with the increase of the protruding channel permeability. The protruding is a process developed from the outside to the inside, and then extends from the hollow center to the periphery. At the end of the protrusion, as the pressure gradient decreases, Layer thickness increases. Proposed closed door, filter layer and metal fence with the use of coal uncover recommendations.