CAJ | 학술논문

　　斜群桩受水平荷载作用时，群桩中的基桩受到径向荷载、轴向荷载和弯矩的共同作用。为研究轴向荷载对斜桩水平承载特性的影响，完成了3根单桩以及1组1×2斜桩的大尺寸模型试验。试验结果表明：轴向拉力作用会降低斜桩的水平刚度和极限承载力；而轴向压力作用则会使其水平刚度和极限承载力提高。基于桩侧浅层土体楔形破坏假定，推导了考虑轴向荷载影响的斜桩水平极限土抗力计算公式，提出了桩侧土抗力的p-y曲线方法，并通过模型试验及现场试验验证其合理性。
　　사군장수수평하재작용시，군장중적기장수도경향하재、축향하재화만구적공동작용。위연구축향하재대사장수평승재특성적영향，완성료3근단장이급1조1×2사장적대척촌모형시험。시험결과표명：축향랍력작용회강저사장적수평강도화겁한승재력；이축향압력작용칙회사기수평강도화겁한승재력제고。기우장측천층토체설형파배가정，추도료고필축향하재영향적사장수평겁한토항력계산공식，제출료장측토항력적p-y곡선방법，병통과모형시험급현장시험험증기합이성。
When batter pile group are under lateral load, the foundation piles in pile group are subjected to radial load, axial load and bending moment. In order to study the influence of axial load on lateral bearing capacity of batter piles, large-scale model tests of three single piles and a 1×2 batter pile group have been conducted in a larger soil tank. It is found that the upward axial force on the pile top decreases the lateral stiffness and the lateral ultimate bearing capacity of batter pile; while the downward axial force enhances the horizontal stiffness and the lateral ultimate bearing capacity of batter pile. Based on the assumption of wedge failure of the shallow soil around piles, considering the influence of axial load on piles, a formula for calculating the lateral ultimate resistance force of soil is deduced. Then, a p-y curve method for resistance force of soil around piles is proposed. Finally, the formula and the proposed p-y curve method for batter pile are verified by model tests and field tests.