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基于前人研究成果,建立了适应于相邻两道计算频散曲线的τ–p变换法提取瞬态瑞雷面波的方法理论,提出了压实度与横波速度和深度之间的经验数学模型。理论模型计算和实例对比试验研究结果表明:①τ–p变换法能有效和正确提取瞬态瑞雷面波,所提取瑞雷波满足采用相邻两道计算频散曲线的需要,打破了常规方法必须采用多道才能有效获取频散曲线的局限,解决了当前惯用方法不能准确检测局部和小区域异常的问题,大大提高了瞬态瑞雷面波法检测的纵、横向分辨率和精度,为瞬态瑞雷面波的拓宽应用奠定了基础;②通过最小二乘法标定后的压实度与横波速度和深度之间的统计数学模型,可获取压实度的绝对值,所求取压实度满足高等级公路对质量检测的要求;③瞬态瑞雷面波法可较准确地快速、无损和连续探测路基的压实度及分布情况和均匀性,探测路基中不良地质体的埋深及分布范围,实现路基质量的综合评价,为路基质量的无损检测提供了一种行之有效、经济快捷的检测方法。
Based on the results of previous studies, a method based on τ-p transformation of two adjacent dispersion curves is proposed to extract transient Rayleigh waves. Empirical math between compaction and shear wave velocities and depths is proposed model. The results of theoretical model calculation and example comparison test show that: ①τ-p transform method can effectively and correctly extract transient Rayleigh wave, and the extracted Rayleigh wave satisfies the need of using two adjacent curves to calculate dispersion curve, breaking the conventional method It is necessary to use multiple channels to effectively obtain the dispersion curve, solve the problem that the current conventional methods can not accurately detect the local and small area anomalies, and greatly improve the vertical and horizontal resolution and accuracy of transient Rayleigh wave surface detection The foundation of the broadening and application of transient Rayleigh wave was established; ②The statistical comparisons between the compaction degree and the shear wave velocity and depth after calibration by least square method can obtain the absolute value of compaction degree, Degree to meet the high-grade highway quality inspection requirements; ③ transient Rayleigh surface wave method can be more accurate and rapid, non-destructive and continuous detection of subgrade compaction and distribution and uniformity of detection of subgrade embankment buried depth And the range of distribution to achieve a comprehensive evaluation of subgrade quality, providing an effective and cost-effective detection method for non-destructive testing of subgrade quality.