Research on combined support technology of large section intersection in deep roadway
In view of the problem that the support of deep large section roadway is prone to instability,the engineering geological survey and roadway deformation analysis are carried out based on the engineering background of the large section intersection of-1100 central track mountain yard in Tangshan Mine.The combined support scheme of bolt-shotcreting+bolt-grouting is proposed,and FLAC3 D numerical simulation is used to analyze the deformation of roadway before and after the improvement of support scheme.The results show that the roof subsidence and side displacement of large section roadway under conventional bolt-mesh-shotcreting support are large,and the roadway cannot achieve self-stabilization.Under the combined support of bolt-shotcreting+bolt-grouting,the deformation of roadway is greatly reduced,and the roadway basically achieves self-stabilization.The scheme is applied to engineering practice.The combined support technology of bolting and shotcreting+bolting and grouting can effectively control the deformation of deep large section roadway.Falling capacity of the roof is reduced by 78.8％compared with the original support,and the displacement of the side is reduced by 54.8％,which provides a reliable technical reference for similar engineering background.
large section roadwaylaneway instabilitydeep high stressgrouting supportcombined support
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