Study on deep full section bolt-net shotcrete support technology in Xincheng Gold Mine

In view of the phenomenon of frequent deformation and failure of roadway surrounding rock after entering deep mining in Xincheng Gold Mine, the influence of different bolt lengths, different bolt preloads and different tunnel section sizes on supporting effect is analyzed by numerical simulation method.The results show that there is no positive relationship between bolt length and bolt anchoring effect.When the bolt length exceeds 2.3 m, the bolt anchoring effect did not change significantly.When the bolt preload is 100 kN, the bolt anchoring effect is the best.The surface tensile stress of small-section roadway is obviously smaller than that of large-section roadway, and its failure zone is smaller.Based on the above analysis and combined with the actual engineering site, the technical parameters of full section bolt-net shotcrete are put forward, and the feasibility of the supporting parameters is verified according to the engineering site, providing technical support for the occurrence of the accident of the deep roof and wall falling and wounding in the gold mine.