According to the complex geological phenomena in rock and soil medium and the features of strata, a three dimensional strata model is established.

根据岩土介质中复杂的地质现象及其地层的层状展铺特性，建立了三维地层模型。

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In the application of elastoplastic medium theory, the rock and soil are assumed to be elastoplastic medium, and the stress change due to tunnel excavation can be calculated, too.

应用弹塑性介质的本构理论，视岩体为弹塑性体，得到隧道开挖引起的地层应力变化计算公式、计算程序。

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Based on the theory of Rayleigh wave propagation in layer medium, the variation of wave velocity can reflect the variation of rock and soil mechanical property.

根据瑞雷面波在层状介质中的传播理论，波速的变化可以反映出岩土力学性质的变化。

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