Disconnectable　coupling　(DC)　joint　is　an　important　connecting　device　in　support　system,　and　its　bearing　capacity,　which　is　usually　inaccessible,　has　a　crucial　impact　on　the　support　system＇s　bearing　capacity.　In　order　to　quantitatively　study　the　bearing　capacity　of　a　DC　joint　and　propose　relatively　accurate　formulas　for　calculating　its　yield　load　and　compression　stiffness,　indoor　axial　loading　tests　were　carried　out　on　three　DC　joints　in　this　paper,　and　a　series　of　numerical　simulations　was　performed　by　using　the　finite　element　method　(FEM)　of　ABAQUS.　Firstly,　load-displacement　curves,　load-strain　curves　and　failure　modes　of　three　joints　were　obtained.　Secondly,　the　numerical　results　were　verified　by　experimental　results　in　failure　modes　and　load-displacement　curves.　Subsequently,　parametric　studies　were　conducted　to　analyze　the　influence　of　the　steel　wedge　dimensions,　steel　tube　wall　thickness,　middle-rib　plate　height　and　middle-rib　plate　shape　on　the　yield　load　and　initial　compression　stiffness　of　the　DC　joints.　Finally,　calculation　formulas　for　estimating　accurately　the　yield　load　and　initial　compression　stiffness　of　the　DC　joints　were　obtained.