Study On Excavation Technology Of Semi-Coal Rock Roadway In Liangshuijing Coal Mine

Shenmu Huisen Liangshuijing Coal Mine has problems such as many teams,many personnel,low efficiency,slow speed and poor safety when mining 4-3 coal seams.Based on the above problems,this paper proposes to use the EBZ-260H high-intensity roadheader and bolting machine to work together,and improve the underground tunneling process organization design,construction method,roadway transportation system,bolt support scheme and dust removal method to improve the roadway.Excavation efficiency,alleviating the problem of 4-5 coal seam face replacement,and achieved the following main results:（1）Based on the engineering rock mass ratio Oswego classification method（CSIR）,and the actual situation of Liangshuijing coal mine,the fine rock sandstone of the roadway roof is obtained,and the RMR values of 4-3 coal and siltstone are 60,27,52 respectively.The 431301 lane is designed as a rectangular section with a size of5400 mm×3000 mm.Through FLAC^3D and Tecplot software simulation analysis and test,the best arrangement of 431301 rubber roadway is determined as the topping.（2）Based on the characteristics of 431301 rubber roadway as a semi-coal rock roadway,two roadway excavation methods,such as borehole blasting method and comprehensive digging method,are proposed.After analysis,it was determined that the Sany Heavy Industry EBZ-260H roadheader was used together with the CMM2-21 hydraulic anchor drill truck to carry out roadway full-section roadway excavation and support.The design of the excavation construction adopts the“March8”work system and implements the“two excavation and one quasi”production operation mode.（3）Using the theoretical analysis to determine theΦ18×2100 mm class II threaded steel bar andΦ18×1800 mm class II threaded steel bar andΦ15.24mm×7300 mm anchor cable for roadway joint support.The designed anchor spacing between the bolts is 1000 mm×1000 mm,and the designed anchor cable is 2000 mm along the roadway direction.（4）Using FLAC^3D simulation to verify the rationality of the theoretical determination of the bolt support scheme,and combined with MATLAB analysis to determine the optimal control top distance of the anchor is 3 m.Through on-site measurement,it shows that there is no separation layer on the roof of the roadway,and the support effect is good.On-site statistics 431301 rubber transport lane monthly excavation is 356.9 m,431301 return air duct monthly excavation is 129.4 m,after equipment upgrade and process improvement,the excavation speed improvement effect is very obvious.（5）Combining with the actual situation of the mine,the KCS-450D-II dust collector and supporting dust-reducing equipment are adopted,and the combination of mechanical dust reduction and artificial dust reduction is proposed to minimize the amount of dust in the roadway.The actual measured dustfall at the heading of the roadway is 72.6.%,the amount of dust falling on the downwind side of the air outlet of the roadway is 50.1%,and the dust reduction effect is obvious.