Study on deformation characteristics and support technology of roadway in deep complex stress field.

The deformation of deep roadway is more severe under the influence of high stress, especially in the complex stress field, which is difficult to support and seriously affects the safety. Leveraging the engineering context of deep complex stress fields, this study constructs a three-dimensional mechanical model for roadway excavation. It employs numerical simulation to analyze the deformation characteristics of surrounding rock and the distribution of deviatoric stress, identifying critical areas for roadway support and clarifying the support methodology. The collaborative support technology of ‘multi-level pre-tightening of anchor cables + multi-level shotcrete sealing of surrounding rock surface + high-pressure grouting reinforcement of surrounding rock cracks’ in deep complex stress field is proposed. The parameters of each specific support method are calculated, which effectively resists the large deformation of roadway in deep complex stress field. The deformation of roadway and the stress of support body are within the allowable range of safety, and the effective control of roadway in deep complex stress field is realized. It provides reference for roadway support under similar deep complex engineering conditions.