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岩土力学性质决定剪切波在其中的传播特征包括波速、波幅、周期和衰减等.以往在测试井壁地层剪切波速度时大多仅利用其判定场地土类别.我们则利用波速异常(过大或过小)及波形特征变化(波幅显著减小,周期明显变大等)判定塌孔并研究对波速测试结果的影响;同时依据小地层波速和波形相近的特征将相邻小地层合并;而对大地层则依据波速和波形特征相近的道数重新划分.
The geomechanical properties of rock and soil determine the propagation characteristics of shear waves in them, including wave velocity, amplitude, period and attenuation, etc. In the past, most of the field soil types were only used to test the shear wave velocities of borehole formations, Large or too small) and changes in the waveform characteristics (significantly reduced amplitude, the cycle is significantly larger, etc.) to determine hole collapse and study the impact of wave velocity test results; at the same time based on the characteristics of small formation wave velocity and waveform similar adjacent small formations; While the stratum is re-divided according to the number of similar wave velocity and waveform features.