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。为保证岩石中存在微隙，对部分试样还作了高温预热处理。实验结果表明，泥质砂岩和泥岩的Ｖ＿ｐ／Ｖ＿ｓ值几乎保持不变，但坚硬砂岩的Ｖ＿ｐ／Ｖ＿ｓ值曲线却在应力达破坏荷载的９０％左右时出现下凹现象，经热处理的硬砂岩的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. In order to ensure the existence of micro-cracks in the rock, part of the sample also made a high temperature preheat treatment. The experimental results show that the V_p / V_s values ​​of shaly sands and mudstones remain almost unchanged, but the V_p / V_s curves of sands have undergone sag when the stress is up to 90% of the destructive load. The heat-treated hard sandstone This sinking phenomenon is more prominent.