| The No.1 coal seam,which is mainly mined in Yiluo Coal Mine,belongs to the “three soft”,unstable,and large inclination(35°-45°)thick coal seam,which is a complex and difficult-to-mine coal seam.In response to the requirements of the country and the industry for high production and efficiency,mines must vigorously promote comprehensive mechanized mining.Corresponding passive support for mining roadways should also be eliminated.Anchor-net-cable support shall be promoted,and I-shaped steel shed support shall be adopted for mining roadway support.,The amount of repair work is large and the efficiency is low,so it is necessary to carry out research on the support method and technology of the mining roadway.This paper comprehensively uses support vector machine(SVM)methods,on-site investigations,indoor tests,numerical simulations and on-site monitoring methods to study the support scheme and construction technology of the stoping roadway in the 33060 working face of the "three soft" seam in Yiluo Coal Mine.The conclusions are as follows :(1)Yiluo Coal Mine 33060 working face high-inclination coal seam stoping roadway originally used trapezoidal cross-section,and the support method was shelving + hydraulic prop support.The roadway has large displacement and serious deformation,which is not conducive to the safe use of the roadway.Drill holes and peek at the surrounding rock of the roof of the upper trough of 33060.It is found that the surrounding rock of the roof of the upper trough of 33060 is relatively broken.The broken area and the intact area are alternately distributed.The strength of the surrounding rock is relatively low,especially the surrounding rock within 2.5m of the roof is severely broken.Which shows that the effect of scaffolding support on the roadway supporting the top coal is not ideal,and the top coal is easy to fall and cause empty roof phenomenon.(2)The support vector machine method was used to construct a program for selecting parameters for supporting large-incline coal seams.Through theoretical calculations and engineering analogy,the anchor-net-cable supporting scheme was determined for the 33060 lower trough.The cross-sectional shape was a pentagonal profiled cross-section and designed Detailed support parameters.(3)The orthogonal numerical analysis method is used to simulate the stability of the surrounding rock of the mining roadway in the three-soft coal seam with a large dip,and the order of the impact on the roadway deformation from large to small is obtained,and it is determined that the pentagonal special-shaped section is the most suitable for Yiluo coal mine.33060 The cross-sectional shape of the mining roadway.(4)Using physical similar simulation tests to study the failure characteristics of the surrounding rock of a roadway supported by bolts,meshes and cables under different supporting pressures,the roof at the left side of the roadway where the triangle coal is left appears large deformation;with the increase of the top pressure coefficient,the roof of the roadway The damage depth of the floor is gradually increasing.Under the action of high supporting pressure,the support at the left side of the triangle coal and the roof of the roadway should be strengthened,and at the same time,the support of the roof and the middle of the two sides should be strengthened.(5)Using the method of industrial engineering process analysis,the bolt-net-cable support process of Yiluo’s high-inclined coal seam was improved.After the improvement,the total number of processes in the process was reduced from 46 to 27,and 19 processes were reduced.The total process time was reduced from 362 min to 291 min,and the entire process time was reduced by about one-sixth,the improvement effect was obvious,and the efficiency of anchornet-cable support was improved. |
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