Research conclusions: Cho ice o f reasonable comprehensive treatm ent p lan is cruc ia l to treating the collapse area of high gas tunne.l The treatment o f the co llapse o f this tunne l included three stages: ( 1) The geo log ica l exploration w as conducted to determ ine the co llapse length and he ight and surrounding rock c ircumstances. ( 2) The treatment w as conducted to the gas w ith in the scope of the co llapse. ( 3) The primary support w as removed and rep laced to treat the co llapse. The advanced drilling w as conducted to detect the fracture gas fo r gas contro,l the <75 + <51 long selffeeding anchor ( grout ing ) w as used for the advanced suppor,t the pre- grouting w as conducted to solid the co llapse body, the benchmethod w as used to excavate the co llapse body, the short foo tage drilling w as used, and the concrete w as shotcreted to close the new excavation face, follow ing by do ing the primary support and secondary lin ing. W ith these treatm ents, the collapse area w as effectively contro lled and treated and the tunne l passed through the co llapse area safe ly.