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通过对应力波在深层搅拌桩中传播过程的数值模拟,分析了不同脉冲荷载、接收点位置、缺陷类型、桩周土体性质对应力波传播的影响,得到不同条件下反射波的信号特征。结果表明:采用橡胶锤激振能够获得较好的信号,接收点位于距桩心0.70R附近处效果最佳;不同缺陷具有不同的反射波特征,具体表现在反射波的相位和振幅上;同时,随着缺陷的增大,桩底反射波的振幅呈减弱趋势。桩周土成层时与单一土层相比,应力波的传播速度明显减小。
Through the numerical simulation of the propagation process of stress waves in deep mixing piles, the influence of different pulse loads, receiving points, defect types and soil properties around the pile on the propagation of stress waves is analyzed, and the signal characteristics of reflected waves under different conditions are obtained. The results show that the rubber hammer excitation can obtain a better signal, the receiving point is located at 0.70R near the center of the pile, and the effect is best. Different defects have different reflected wave characteristics, which are reflected in the phase and amplitude of the reflected wave. With the increase of defects, the amplitude of reflected wave at the bottom of the pile shows a weakening trend. Compared with single soil layer, the propagation velocity of stress wave obviously decreases when strata are formed.