Research on J2 Evolution Law and Control under the Condition of Internal Pressure Relief in Surrounding Rock of Deep Roadway

In order to solve the support problem of deep soft crushed coal roadway, a concentrated cavern in mining station mine is taken as test object. Based on analysis and summary field observation data law rock pressure appearance, new technology relief anchoring with main body “initiative + borehole relief” proposed. This will carry out strong active shallow part surrounding excavate row low-density large-diameter boreholes roadway ribs. The numerical model established by FLAC3D, second invariant deviatoric stress (J2) used index elaborate influence different parameters effect rock. results show that have effects relief, is, depth > length spacing. After process relieve rock, deformation side subsequent always controlled within range 100 mm, system effectively protected. comprehensive control very obvious. Therefore, practice proves supporting can large similar