CAJ | 학술논문

斜向荷载作用下抗拔螺旋桩基础的研究选用螺旋桩为研究对象,引入了随动坐标系,并将桩-土相互作用形成的地基反力以载荷的形式施加于桩体和叶片,解决了大变形材料使用小变形弹性材料叠加原理问题,分析了斜向荷载抗拔螺旋桩基础的破坏模式,建立了斜向荷载作用下抗拔螺旋单桩和群桩基础的极限荷载估算公式,通过与螺旋群桩原型试验的极限荷载判定值的对比,斜向极限荷载估算值约为判定值的93.3 %.表明所使用的研究方法,提出的破坏模式和极限荷载计算方法比较符合实际情况,对斜向荷载抗拔螺旋桩基础工程的设计与分析有一定的指导意义.
사향하재작용하항발라선장기출적연구선용라선장위연구대상,인입료수동좌표계,병장장-토상호작용형성적지기반력이재하적형식시가우장체화협편,해결료대변형재료사용소변형탄성재료첩가원리문제,분석료사향하재항발라선장기출적파배모식,건립료사향하재작용하항발라선단장화군장기출적겁한하재고산공식,통과여라선군장원형시험적겁한하재판정치적대비,사향겁한하재고산치약위판정치적93.3 %.표명소사용적연구방법,제출적파배모식화겁한하재계산방법비교부합실제정황,대사향하재항발라선장기출공정적설계여분석유일정적지도의의.
The screw pile body and pitch of screw is chosen as the subject investigated of the pull-out screw pile foundation under inclined load; and the subgrade reaction by the pile-soil interactivity were put on surfaces of pile body and pitch of screw by the formal load; at the same time,the moving coordinates were introduced in the analysis.So the used problem of superposition theorem for large deformation material system,for instance soil-pile,could be transferred the small deformation & elastic mass for screw pile body and pitch of screw.The failure model of pull-out screw pile under inclined load was analyzed; and the calculation of ultimate load for a pile and pile group were given; and calculations of ultimate inclined load of screw pile group was 93.3% to the average determined value from field pull-out tests under inclined load.It is shown that the research technique,the failure model and the calculation formulas are consistent with the practical characteristics of the pull-out screw pile group under inclined load on the whole; and these research results can guide the designing and analysis of pull-out screw pile foundation under inclined load.