Study On Key Technology And Process Optimization Of Coal Roadway Fast Driving Support

In this paper,the wind roadway of W3233 working face of Qianyingzi Coal Mine is taken as the actual engineering background,and the key technology and process optimization of fast driving coal roadway support are taken as the main research object.Through the field survey,the determination of rock mechanics parameters of test roadway,combined with FLAC3D numerical simulation,Three-Dimensional similarity simulation test,tunneling process optimization research and field industrial test and other comprehensive research methods,the key technology and process optimization of coal roadway rapid tunneling support are studied.The main results are as follows:(1)The geological conditions of the test tunnel are comprehensively studied and the characteristics of the geological conditions of the test tunnel are analyzed.Through the related tests of rock mechanics parameters in the laboratory,the strength of surrounding rock of the roof and floor of the test roadway is measured,which provides support for the subsequent research.(2)According to the geological data and mechanical measurement of the relevant parameters,combined with the actual parameters of the test roadway,the theoretical calculation of supporting parameters,determine the reasonable parameter range,to provide a theoretical basis for the optimization of supporting parameters.FLAC3D numerical simulation software was used to analyze the optimal roadway support parameters and hysteresis process.Firstly,the stress and displacement cloud map of roadway excavation without support was simulated and analyzed,and then two support optimization schemes were proposed according to the theoretical calculation parameter range and analysis results.The original support scheme and two optimization schemes were numerically simulated,and the cloud maps of vertical stress,vertical displacement and horizontal stress,horizontal stress and plastic zone were compared and analyzed.It was concluded that 7 bolts with 800×1000mm spacing between roof and 10 bolts with 800×1000mm spacing between two sides were adopted.Roof anchor cables with 2×1×2 layout and row spacing of 1600×2000mm were used to achieve the best effect.(3)By comparing the displacement stress cloud and convergence coefficient of the lag scheme,the best lag scheme is obtained.Using 7 roof bolts without lag;The help part of the first 4,the bottom two bolt lag 20m;Roof anchor cable layout of 2×1×2,followed by the roof anchor bolt to the alley anchor cable,the roof on both sides of the lag of 20m lag scheme is the best.(4)The 3d similar simulation test device was used to simulate the deformation of surrounding rock of roadway under different support parameters during the test tunneling,and the optimization scheme obtained by numerical simulation was verified and compared.Model set up three different parameters of roadway support,in the process of roadway drivage simulation using high-definition drilling into instrument of model of roadway roof and two for deformation of the real-time monitoring,use SLR continuous shooting technology analysis of displacement of surrounding rock deformation of roadway extraction process,using strain gauge data collection and analysis of roadway surrounding rock stress evolution.(5)By optimizing the tunneling configuration equipment and using the monorail hydraulic bolt drill,the bolt at the bottom of both sides and the roof anchor cable are delayed to supplement,which saves the time of headface support and greatly improves the tunneling speed.By optimizing the supporting scheme,the row spacing between anchor cable supports is increased and the cycle progress is improved.By optimizing the operation mode and parallel processing of related processes,the roadway excavation efficiency is improved on the premise of ensuring safety.(6)Based on the theoretical analysis,numerical simulation and similar simulation test results,the optimized support scheme and support technology are proposed,and the field industrial verification is carried out in combination with the wind roadway and engine roadway of Qianyingzi coal mine W3233 working face.The field data were observed by borehole peeping,geological radar detection and surrounding rock indication and monitoring.The results showed that the overall deformation of surrounding rock was small and the driving speed was greatly increased within a safe range after using the optimized scheme and technology.Figure[105]Table[13]Reference[86]...