CAJ | 학술논문

为了研究传统基坑工程钢支撑活络头和不同接触面处理（无滚花、直纹滚花、网纹滚花）的新型抱箍式活络头刚度特性和极限承载力，进行了室内原型试验，观察其受力过程和破坏特征，分析了不同设计参数对位移、应变、承载力的影响。试验研究结果表明：抱箍式活络头整体刚度高于单缸千斤顶支顶活络头，在荷载为2000 kN时，单缸千斤顶支顶活络头位移约是抱箍式活络头的1．5～4倍；在正常使用状态下，试件可重复使用；在达到极限承载力时，抱箍式活络头发生微小脆性滑移破坏，滑移之后可继续承载；由于底部螺栓的夹持作用，抱箍式活络头调节长度短时，即接触面积大时，承载力反而减小；在轴向压力作用下，抱箍式活络头螺栓预拉力基本不变。总体上看，抱箍式活络头具有良好力学特性，有助于提高基坑工程内支撑体系的安全性和稳定性。
위료연구전통기갱공정강지탱활락두화불동접촉면처리（무곤화、직문곤화、망문곤화）적신형포고식활락두강도특성화겁한승재력，진행료실내원형시험，관찰기수력과정화파배특정，분석료불동설계삼수대위이、응변、승재력적영향。시험연구결과표명：포고식활락두정체강도고우단항천근정지정활락두，재하재위2000 kN시，단항천근정지정활락두위이약시포고식활락두적1．5～4배；재정상사용상태하，시건가중복사용；재체도겁한승재력시，포고식활락두발생미소취성활이파배，활이지후가계속승재；유우저부라전적협지작용，포고식활락두조절장도단시，즉접촉면적대시，승재력반이감소；재축향압력작용하，포고식활락두라전예랍력기본불변。총체상간，포고식활락두구유량호역학특성，유조우제고기갱공정내지탱체계적안전성화은정성。
In order to study the stiffness and ultimate bearing capacity of the traditional disconnectable coupling and differ-ent interface hoop-disconnectable coupling (no-knurling,straight-knurling and hatching-knurling),laboratory prototype ex-perimental was done to observe the loading process and failure characteristics as well as analyze different design parame-ters’effect on displacements,strain and bearing capacity.The main conclusions are drawn as follows:the hoop-discon-nectable coupling's stiffness is higher than the traditional and under the same load of 1 200 kN,the displacement of the tra-ditional is 1 .5 or 4 times as large as the hoop-disconnectable coupling’s;the specimens can be reused under normal opera-tion;when the ultimate bearing capacity is reached,the tiny brittle failure occurs on the hoop-disconnectable coupling, which can continue carrying after slipping;due to the clamping of the bottom bolt,when the adjustable length is short, namely the contact area becomes larger,the carrying capacity instead decreases;the bolt’s pretension is essentially un-changed under the axial compression.Overall,the hoop-disconnectable coupling has good mechanical properties which can help improve the security and stability of the supporting system in the excavation engineering.