Application Research Of N2303 Roadway Support In Gucheng Mine Based On Geostress Inversion

The continuous construction of underground space is the cumulative process of successive release and re occurrence of original rock stress.The change of ground stress has an important impact on the stability of underground space,and is the fundamental cause of rock mass damage in rock excavation projects such as water conservancy projects,underground warehouses,tunnels,subways and mining projects.Accurate in-situ stress data is the premise of safe operation of underground space,the guarantee of geotechnical engineering science and systematic decision-making,and the technical support of deep mining in coal mine.In this study,after coring in the West Wing mining area of Gucheng mine,the mechanical parameters of typical rock strata are studied,and the rock mechanical parameters required for subsequent numerical simulation are obtained;in the West Wing mining area,the in-situ stress test and research are carried out,and the deviation angle range between the main roadway and the vertical principal stress in the West Wing mining area of Gucheng mine is 5.43°?22.53?,with an average of 12.51?,the included angle range with the first horizontal principal stress is 48°?62°,flat is 56°.The angle range between them and the second horizontal principal stress is 33?420 with an average of 36.75°.Then the ANN artificial intelligence network system is used to invert the boundary conditions.The final inversion results are ux=2.64m,uy=1.83m,the relative error of residual is 8.7%?23.2%,and the average relative error is 16.7%.After the boundary condition is applied to the West Wing mining area as the boundary condition,the maximum principal stress is 12.64MPa,the middle principal stress is 10.27MPa,and the minimum principal stress is 6.52MPa,after the regional geostress inversion,and then slice the inversion model at four measuring points.1#the error of inversion and measurement is 13.2%,2#the error of inversion and measurement is 18.5%,3#the error of inversion and measurement is 20.4%,4#the error of inversion and measurement is 16.3%.Based on the analysis of the stability of the roadway caused by the in-situ stress,the vulnerability is introduced to evaluate the stability of the surrounding rock of the roadway,and then n2303 is proposed According to the distribution characteristics of predicted regional ground stress,input the boundary conditions of FLAC3D,reasonably simulate the coordination between surrounding rock and support system,put forward reasonable support scheme and parameters,and finally select the scheme of 900 x 900mm row spacing between anchor bolts and 1500 × 1800mm row spacing between anchor cables.There are 74 figures,34 tables and 74 references in total.