Numerical Simulation Of Rockburst Based On The Rock Surface Stress Field

At present, many underground project or space have been near or above1,000meters in domestic, and have entered the stage of deep operations. With the increase of excavation depth, the environment of rock mass is become worse and worse. The deterioration of mining condition brings about the phenomenon of roof collapse and rib spalling, even dynamic geological disaster such as rockburst. The damage produced by the rock of geological disasters to the country, the safety of construction personnel and equipment will adversely affect, in particular rockburst is undoubtedly brought about by the high field stress is the most important. Underground excavation of rockburst generation and prediction is very necessary.In this paper, the finite element method to the semi-arched tunnel of the stress field and rockburst may occur. Come to the roadway surface stress field by the finite element calculation of the tunnel model to study the stress state rock surface changes of the maximum principal stress, summed up and given the rockburst location and the depth of the crater curve.The main contents of this paper include:(1)The changes in the research tunnel size of the maximum principal stress on the roadway surface and tunnel rockburst discrimination.(2) Vertical ground stress on the roadway plastic deformation process of the maximum principal stress and the surrounding rock research.(3) Different stress field of the role of the roadway surface stress field analysis, come to the roadway may occur in rockburst location, and the maximum principal stress on the roadway surface and rockburst crater depth linear fitting.(4) Rockburst during excavation for the Jinping Hydropower Station, the conclusions in this paper was analyzed to prove the practicality of the conclusions in this paper.