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为了论证纵波扭转波综合分析基桩质量的可行性,通过理论分析和动力有限元分析得到了三维状态下纵波和扭转波的传播特性,并对基桩质量纵波扭转波综合分析法进行了实际工程验证。结果表明:纵向荷载激励时,桩顶的接收波中不但含有纵波成分,还含有横波成分;扭转荷载激励时,桩顶的接收波中不但含有扭转波成分,还含有弯曲波成分,且扭转波属于横波,其波速小于纵波波速;在相同条件下,与纵波相比,扭转波的分辨率高,测试盲区深度小,对桩身的浅部缺陷更敏感,能较好地解决纵波测试中无法辨识出桩身浅部缺陷的难题;该方法能够应用于实际工程。
In order to demonstrate the feasibility of longitudinal wave torsional wave comprehensive analysis of pile foundation quality, the propagation characteristics of longitudinal wave and torsion wave in three-dimensional state are obtained through theoretical analysis and dynamic finite element analysis. The actual engineering of longitudinal wave torsional wave analysis of pile mass is carried out. verification. The results show that when the longitudinal load is excited, the wave received at the top of the pile not only contains the longitudinal wave component but also the transverse wave component. When the torsional load excitation is applied, the receiving peak of the pile top contains not only the torsional wave component but also the bending wave component, Under the same conditions, compared with the longitudinal wave, the resolution of the torsional wave is high, the depth of the test blind zone is small, and it is more sensitive to the shallow defects of the pile body, so as to be able to solve the problems of the longitudinal wave test Identify the problem of shallow shallow pile body; the method can be applied to the actual project.