When　a　super-large　diameter　shield　tunnel　passes　through　a　strongly　karst-developed　area,　in　order　to　ensure　the　stability　of　the　tunnel　and　economy　of　karst　reinforcement,　the　reasonable　treatment　range　for　a　huge　number　of　karst　caves　needs　to　be　researched.　Based　on　a　karst　treatment　project　of　a　shield　tunnel　with　a　diameter　of　14.5　m,　this　paper　studies　the　influence　of　intrusive　fully　filled　karst　caves　on　the　stability　of　the　lining　and　excavation　face　by　using　theoretical　calculation.　In　addition,　the　safe　distance　between　the　tunnel　and　karst　caves　outside　the　tunnel　is　proposed　through　numerical　simulation,　and　the　corresponding　treatment　range　is　obtained.　The　results　show　that　the　bearing　capacity　of　the　lining　has　a　certain　reserve　when　the　intrusive　cave　is　smaller　than　a　certain　size,　and　the　caves　filled　with　plastic　or　hard　plastic　clay　have　sufficient　antifracturing　ability.　Therefore,　some　small　fully　filled　caves　inside　the　tunnel　profile　can　be　left　unreinforced.　On　the　other　side,　the　critical　safe　distance　is　only　1-2　m　for　the　caves　with　a　size　of　3　m,　so　the　outside　caves　with　a　size　less　than　3　m　can　be　left　unreinforced　in　the　treatment　range　farther　away　from　the　tunnel.　The　proposed　treatment　range　is　close　to　similar　projects　that　have　been　built,　indicating　that　analysis　results　are　reasonable.