In　this　paper,　the　bearing　capacities　and　failure　behaviors　of　bolt-fastened　wedge　active　joints　used　in　prestressed　internal　supports　are　studied.　A　thorough　exploration　of　the　design　of　the　bolt-fastened　wedge　active　joint　is　elaborated,　and　an　overview,　working　mechanism,　stiffness　analysis,　parameters,　and　strength　checking　are　provided.　Then,　loading　tests　are　conducted　on　four　full-scale　specimens.　One　test　is　an　axial　compression　test,　while　the　other　three　tests　are　performed　to　analyze　the　long-axis　(Y-axis)　eccentricity,　short-axis　(X-axis)　eccentricity,　and　biaxial　(XY-axis)　eccentricity.　The　load–displacement　curve,　load–strain　curve,　bending　moment-rotation　curve,　and　failure　mode　of　each　specimen　are　obtained.　The　experimental　results　show　that　the　samples　have　good　compressive　properties　and　bending　resistance.　The　impact　of　the　X-axis　and　Y-axis　eccentricities　on　the　compressive　ultimate　bearing　capacity　is　investigated,　revealing　a　significant　reduction　in　the　former,　while　the　latter　has　a　minimal　effect.　Under　bidirectional　eccentricity,　the　weakening　of　the　axial　bending　performance　is　most　apparent.　Bidirectional　eccentric　loads　lead　to　a　reduction　in　the　yield　load　and　initial　compression　stiffness　to　approximately　90%　of　those　observed　under　unidirectional　eccentricity.　Finally,　a　field　test　is　carried　out　to　compare　the　constructability　and　load-holding　performances　of　bolt-fastened　wedge　active　joints　with　those　of　commonly　used　steel　wedge　active　joints.　It　is　demonstrated　that　the　bolt-fastened　wedge　active　joint　effectively　maintains　prestress　through　bolt　fastening,　substantially　enhancing　the　safety　of　foundation　pit　excavation　construction.　©　2023　Elsevier　Ltd