A　disconnectable　coupling　joint　with　double　row　wedges　(DCJD)　is　a　crucial　component　of　the　prestressed　internal　bracing　in　subway　foundation　pits.　However,　only　a　few　studies　have　been　conducted　on　the　bearing　capacity　of　the　joints;　moreover,　the　yield　load　and　compression　stiffness　of　DCJDs　are　typically　determined　from　experience.　The　aim　of　this　study　was　to　quantitatively　determine　the　bearing　capacity　and　propose　accurate　formulas　for　calculating　the　yield　load　and　compression　stiffness　of　DCJDs.　Hence,　a　DCJD　was　selected　from　a　foundation　pit　in　Beijing,　China,　and　loading　experiments　were　conducted　under　axial　force.　Load–displacement　and　load–strain　curves　were　obtained,　and　the　failure　modes　of　the　joint　were　analyzed.　The　experimental　results　were　verified　through　several　finite　element　models.　Subsequently,　parametric　analyses　were　performed　to　investigate　the　effects　of　the　dimensions　of　the　key　position　on　the　DCJD＇s　bearing　capacities.　Moreover,　regression　analysis　was　used　to　obtain　the　formulae　for　estimating　the　initial　compression　stiffness　and　yield　load　of　the　DCJD.　Finally,　the　fitting　formulae　results　were　compared　with　the　numerical　and　experimental　results.　The　comparisons　showed　that　the　fitting　formulae　were　highly　accurate　in　estimating　the　bearing　capacity　of　the　DCJD.　©　2021　Tongji　University