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通过工程实测信号和数值模拟分析,证明了瞬态集中荷载敲击下,桩顶三维干扰速度信号的强度沿径向先递减后递增,存在干扰最小点,并对比了不同学者提出的干扰最小点位置处的信号。参数分析表明,三维干扰最小点的位置与桩径、桩长、荷载脉宽、桩身混凝土弹性模量、土层剪切波速及土层泊松比等桩、土参数几乎无关,但与桩身混凝土泊松比密切相关,且泊松比越大,干扰最小点的位置越靠近桩中心。给出了干扰最小点位置与桩身混凝土泊松比之间的函数表达式,可方便应用于实际工程。
Through the engineering measured signals and numerical simulation analysis, it is proved that under the transient concentrated load hitting, the strength of pile-tip three-dimensional disturbance velocity signal decreases first and then increases in the radial direction with the smallest interference point, and compares the interference minimum points proposed by different scholars Signal at location. Parametric analysis shows that the position of the minimum point of three-dimensional interference is almost independent of the pile and soil parameters such as pile diameter, pile length, load pulse width, elastic modulus of pile body, shear wave velocity of soil layer and Poisson’s ratio of soil layer. However, Poisson’s ratio of body concrete is closely related, and the larger the Poisson’s ratio, the closer the position of the interference point to the pile center. The function expression between the minimum position of interference and Poisson’s ratio of pile concrete is given, which can be conveniently applied to practical engineering.