Study on Soft Rock Cavern Groups Support Technology in Deep Mine

In order to solve the problem of large deformation during the excavation and support of the-980m deep chambers in Xinhe coal mine, firstly, through theoretical analysis, the influence of different excavation sequences of adjacent chambers on the failure of surrounding rock was studied.Secondly, FLAC^3D numerical simulation software was used to simulate the different excavation sequences of adjacent chamber groups, calculate the minimum failure volume V_P of surrounding rock plastic zone, and obtain the optimal construction scheme.Based on the above research, the support design was carried out, and it was proposed that anchor mesh, grouting anchor cable and shotcrete were used in the main body of pump house and niche in the early stage, the combined support method of reinforced concrete masonry was adopted in the later stage.The numerical simulation calculation before and after the support of the chamber group implementing the support scheme were carried out.The calculation results show that the maximum subsidence of the roof of the main chamber of the pump house decreases from 927mm to 30mm, the floor heave decreases from 1 036mm to 6mm, and the left side approach of the main pump house decreases from 1 010mm to 10.9mm, and the approach diatance of the palm surface of the niche decreased from 700mm to 9.9mm, the surrounding rock deformation was effectively controlled.The field monitoring results of roof and floor displacement show that the maximum displacement of the two sides of the monitoring section was 8mm and the maximum approach diatance of the roof and floor was 15mm.The roadway support effect was good and the surrounding rock deformation can be effectively controlled.