Numerical Simulation Analysis of Stress and Displacement Field Variation of Chamber Group Disturbed by Excavation

Based on the actual excavation conditions of the large deformation chamber group in XianDe Wang coal mine, through the FLAC3D numerical simulation software, the changing trends of vertical stress sigma(z), horizontal stress sigma(x) and the shear stress tau(xz) have been analyzed by all steps; also concludes that besides the stress concentration zone, the deflection trend of contour in the compressive stress heightening zone is "when they are near, be away; when they are away, be together", that is, as to the horizontal stress and vertical stress, because of the disturbance influence of the lower roadway, the contour of the wall near the upper roadway deflects to the side which is away from the upper roadway and the contour of the wall which is away from the upper roadway deflects to the side which is near the upper roadway; finally concludes that the surrounding rock of the chamber has "displacement tendency" influenced by excavation disturbance, that is, the chambers and roadways in the chamber group are influenced by each other and finally the displacement direction of surrounding rock will move towards the direction of the vector sum of "the main moving direction" and "the disturbing moving direction". Due to the excavation disturbance, the magnitude of the displacement will be influenced by the factors of the relative distance between the disturbing chamber and the geometric size of them.