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基于模型试验方法,开展砂土中竖向荷载作用下低承台2×1和2×2扩底楔形桩群桩桩-土相互作用模型试验,测得不同荷载等级下桩顶荷载-沉降关系曲线、桩端阻力以及桩身轴力等分布规律,同时开展扩底楔形桩单桩竖向承载特性试验作为对比分析。结合JGJ94规范规定的承台效应系数和群桩效应系数,对扩底楔形桩群桩竖向极限承载力进行了理论计算分析。研究结果表明,文中试验条件下竖向荷载作用下低承台2×1和2×2扩底楔形桩群桩的综合效应系数分别为1.16和1.10;无承台作用下2×1和2×2扩底楔形桩群桩的群桩效应系数分别为0.95和0.88;理论计算中扩底楔形桩承台效应系数和群桩效应系数可以参照等直径桩的相关规范取值。
Based on the model test method, the pile-soil interaction model tests of 2 × 1 and 2 × 2 wedged piles under low vertical load were carried out under sand load. The load-settlement relationship of pile top under different load classes Curve, pile end resistance and axial distribution of pile axial force and so on. At the same time, the vertical bearing behavior of single-pile wedged piles was compared as a comparative analysis. Combined with the cap effect coefficient and pile group effect coefficient stipulated by JGJ94 code, the vertical ultimate bearing capacity of enlarged wedged pile group pile is theoretically calculated and analyzed. The results show that under the test conditions, the comprehensive effect coefficients of pile caps with pile groups of 2 × 1 and 2 × 2 under the vertical load are 1.16 and 1.10, respectively. Under the condition of 2 × 1 and 2 × 2 The coefficient of pile group effect of the wedged pile group with pile foundation is 0.95 and 0.88, respectively. For the theoretical calculation, the effect coefficient of pile foundation and the pile group effect coefficient of pile foundation can be referred to the relevant specifications of the pile with the same diameter.