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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 the typical scouring pit shape, different local scouring effects were simulated by changing the scouring depth. The typical 9 pile groups were subjected to the horizontal bearing tests before and after scouring. A parallel comparison test was carried out on the single piles with the same parameters. The load - Displacement characteristics, pile bending moment distribution, pile group efficiency coefficient and load sharing ratio variation. The results show that as the scouring depth increases, the horizontal bearing capacity of single pile and nine foundation all show a decreasing trend, the efficiency coefficient of horizontal group pile increases gradually, the effect of cap restraint is more obvious, the bending moment of pile increases and the maximum bending moment The load sharing ratio of the front row of piles increases, while the load sharing ratio of the middle row and the back row piles decreases. The depth and horizontal load of the front row of piles have the greatest impact, and effective measures for reinforcement should be taken in the design.