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在建立承压含水层物理模型的基础上，把水平分布的承压含水层概化为水平层状的平板型波导，提出了地声信号的承压含水层波导传播机制．应用Ｂｉｏｔ理论推导了承压含水层中地声波作波导传播的谐频表达式．对山东莒县地声井承压含水层进行了计算，得出其基频为３５．０Ｈｚ．利用莒县地声井观测的地声信号作Ｗｉｇｎｅｒ时频分析，得到的频率基本上为基频的整数倍．结果表明，承压含水层对地声波的响应存在着频率选择现象，只有当波的频率ｆ是基频的谐频时，地声波才能在含水层中作导波传播，承压含水层对此才有响应
Based on the establishment of the physical model of confined aquifer, the confined aquifer of horizontal distribution is generalized as a horizontal flat plate waveguide, and the propagation mechanism of confined aquifer waveguides of ground acoustic signals is proposed. The Biot theory is used to deduce the harmonic expression of acoustic wave propagation in confined aquifer. The pressure aquifer of Jisheng well in Lixian County, Shandong Province was calculated and the fundamental frequency was 35.0Hz. Using the ground acoustic signal observed in Jixian earth-sounding well for Wigner time-frequency analysis, the obtained frequency is basically an integer multiple of the fundamental frequency. The results show that there is frequency selection in the response of confined aquifer to ground acoustic wave. Only when the frequency f of the wave is the harmonic of the fundamental frequency, can the ground sound wave propagate in the aquifer, Only response