Deep beam support structure construction of roadway roof with monorail crane and its application

Aiming at the roof controlling problem of roadway which is under the action of monorail crane,the roadway roof is regarded as deep beam for stability analysis,and the dense arrayed high prestressed anchor cable and strength anchored bolt supporting system were applied to construct the composite rock-bolt deep beam bearing structure. FLAC3D software was also used to model the distribution characteristics of anchor cable prestressed field under the con- dition of actual support parameters of S1203 return airway of Yuwu Mine,and the beam forming mechanism of monorail crane roadway roof was revealed. The deep beam thickness of S1203 return airway roof was determined to be 6 m. Fur- thermore,the composite rock-bolt deep beam bearing structure mechanical model under the action of monorail crane was established with the analysis of roof sufferance force of S1203 return airway,and the expression of maximum shear stress distribution in deep beam was deduced according to stress impose theory. Combining Matlab software and the mechanical analysis above,the deep beam maximum shear stress distribution response laws with the change of monorail load was obtained,and the roof stability control mechanism under the action of monorail crane was clarified. According to the result on the observation of rock pressure of S1203 return airway,there were no roof separation after the action of monorail crane. The maximum roof subsidence and convergence of wall rock stays the same,and the values are 72 and 48 mm,respectively. The observation result shows that the construction of roof deep beam structure under the action of monorail crane is feasible and effective.