Abstract: A collapse accident occurred at DK171+050 of the Huangjin Tunnel on the Ganzhou-Shaoguan railway during which ground water seeped from the rock strata, which mainly consisted of calcirudite, siltstone, and mudstone. During the construction process, some special reinforcement schemes such as long pipe-roof pre-reinforcement, fiberglass bolt pre-reinforcement, and full-face advance curtain grouting were adopted in light of the geological conditions of the collapsed section. Furthermore, compaction grouting was conducted by a segmental-forward grouting technique on the principles of grouting from outside to inside, top to bottom, and at intervals, guaranteeing the grouting effects, improving construction efficiency, and ensuring the stability of the surrounding rocks. An analysis of the predicted and actual results was undertaken by means of numerical computation and is discussed in this paper, and treatment schemes for the collapsed sections are presented.