基于典型冲刷坑形态，通过改变冲刷深度来模拟不同局部冲刷作用，对典型的9桩群桩进行了冲刷前、后水平承载试验，对相同参数的单桩进行了平行对比试验，详细分析了荷载-位移特性、桩身弯矩分布、群桩效率系数以及荷载分担比的变化规律。结果表明，随着冲刷深度增加，单桩和9桩基础水平承载力均呈现减弱趋势，水平群桩效率系数逐渐增大，承台约束作用效应更加明显，桩身弯矩增大，最大弯矩点位置向桩端移动，前排桩荷载分担比增大，中、后排桩荷载分担比减小；前排角桩受冲刷深度和水平荷载影响最大，设计时需采取有效的加强措施。

Based on typical scour shape, the lateral bearing capacity tests are conducted on typical nine-pile group foundation to simulate different local scour effects by changing scour depth, and parallel contrast tests on single pile foundation with the same parameters are also carried out. The load-displacement behavior, distribution of bending moment along pile shaft, efficiency coefficient of pile group and load sharing ratio of piles are analyzed in detail. The results show that as the scour depth increases, the lateral bearing capacities of single pile foundation and nine-pile group foundation are both weakened, the lateral efficiency coefficient of nine-pile group foundation increases gradually, the cap constraint effect becomes much more notable, the maximum bending moment along pile shaft increases, the maximum moment point of pile shaft comes down to the pile bottom, and the load sharing ratio of the front piles increases, while load sharing ratios of the rear and middle piles decrease. The front corner pile is severely affected by the scour depth and lateral load, so effective measures should be adopted to enhance the front corner pile in design.