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岩石所受的三向应力状态对其弹性波传播性质有一定的影响，此认识为所做的以泥质砂岩、泥岩和硅质胶结的坚硬砂岩为试样的实验所证实。实验结果表明，泥质砂岩和泥岩的ｖＰ／ｖＳ值几乎保持不变，硬质砂岩的ｖＰ／ｖＳ曲线却在应力达破坏荷载的９０％左右出现下凹现象。经热处理后的硬质砂岩这一下凹现象则更突出
The three-dimensional stress state of the rock has an impact on the nature of its elastic wave propagation. This knowledge is confirmed by the experiments made on samples of shaly sandstone, mudstone and siliceous cemented sandstone. The experimental results show that the vP / vS values of shaly sands and mudstones remain almost unchanged, while the vP / vS curves of sands show a concave phenomenon about 90% of the failure load. After the heat treatment of the hard sand concave phenomenon is even more prominent