In　view　of　the　collapse　accident　of　Ruyi　Tunnel　surrounding　rock　during　tunnel　construction　crossing　soil-stone　composite　strata　in　Huangling-Hancheng-Houma　Railway,　the　influencing　factors　and　collapse　mechanism　of　the　collapse　were　analyzed.　Such　treatment　measures　as　＇pipe　roof　+　small　duct　grouting＇　for　strengthening　the　surrounding　rock　and　enlarging　the　construction　parameters　for　primary　support　and　secondary　lining　were　proposed.　The　effect　of　treatment　measures　was　evaluated　through　field　monitoring　and　three-dimensional　numerical　simulation.　Results　showed　that　the　main　factors　causing　the　collapse　were　complex　strata,　weak　surrounding　rock　and　groundwater.　Due　to　the　influence　of　soil-stone　composite　strata　and　groundwater,　a　larger　additional　load　was　produced　on　tunnel　arch,　which　led　to　the　heave　and　damage　of　rock　mass　at　the　arch　crown,　and　further　led　to　the　massive　instability　failure　at　the　arch　of　tunnel　face.　After　the　treatment　for　the　tunnel　in　the　collapse　section,　the　measured　settlement　and　horizontal　convergence　displacement　at　arch　crown　were　26　and　30　mm　respectively.　The　pressure　between　the　primary　support　and　surrounding　rock　of　the　arch　crown　was　128　kPa.　The　settlement　of　arch　crown　obtained　from　numerical　simulation　dropped　from　662　to　47　mm.　The　plastic　zone　around　the　tunnel　was　reduced　to　63%　of　the　original　design.　It　shows　that　the　treatment　measures　can　effectively　control　the　pressure　and　deformation　of　surrounding　rock　and　thus　the　construction　risk　is　lowered.　For　tunnel　construction,　attention　should　be　paid　to　the　advance　reinforcement　for　tunnel　face.　©　2018,　Editorial　Department　of　China　Railway　Science.　All　right　reserved.