Freezing　reinforcement　and　mining　excavation　were　jointly　conducted　in　recovering　a　collapsed　tunnel　in　Shanghai　metro　No.4　line.　According　to　the　basic　theory　and　engineering　experience　of　artificial　freezing,　freezing　system　and　parameters　for　the　recovering　collapsed　tunnel　were　determined.　Forced　thawing　was　implemented　sequentially　for　different　sub-regions.　Fill　grouting　between　the　structure　and　the　frozen　wall　and　thaw-settlement　compensation　grouting　were　used　for　control　of　strata　thaw　settlement.