Study on Surrounding Rock Modification of Rock Burst Roadway

In view of the research on the modification of roadway surrounding rock, the combination of theoretical analysis and laboratory test is mainly used to theoretically analyze the factors affecting the plastic zone range of surrounding rock before modification. The mechanical properties and acoustic emission characteristics of the specimens in different time periods after modification were studied by experiments. The fracture mechanics of the surrounding rock modified body was studied by compressive, tensile, shear and acoustic emission experiments. The results show that the range of plastic zone of surrounding rock before modification is affected by parameters such as support resistance, lateral pressure coefficient, softening coefficient, dilatancy gradient and residual strength. The results show that the range of plastic zone of surrounding rock before modification is affected by parameters such as support resistance, lateral pressure coefficient, softening coefficient, dilatancy gradient and residual strength. When other conditions are certain, increasing the residual strength of the surrounding rock crushing zone can reduce the range of the surrounding rock plastic zone; the compressive strength of 7 days, 14 days and 28 days of the modified body gradually increased, and finally reached 48.95% of the strength of the original coal sample. The tensile strength of 28 days reached the strength of the original coal sample, and the cohesion was increased by 2.05 times compared with the complete coal sample, which had a good effect on the improvement of the plastic zone of the surrounding rock. The acoustic emission research shows that the acoustic emission signal of the modified body specimen changes strongly at 7 days and 14 days, and a large number of acoustic emission signals are generated at each stage. The internal situation of the specimen is complex under the force condition, while the acoustic emission signal of the modified body at 28 days is relatively stable, mainly before and after the failure. Under the action of time, the failure mode of the modified body gradually changes from ductile failure to brittle failure. It is proved that the strength of the modified body reaches the saturation value after 28 days, and the construction can be carried out again after the strength of the surrounding rock is stable. According to the actual situation, the grouting modification scheme of surrounding rock is formulated, and the displacement of the roof and floor of the surrounding rock and the two sides is monitored. The stability of the modified surrounding rock increases and the deformation decreases.