Whatever the straight line part of the stress-strain curve may be,it is always possible to find out the rock stress threshold by the peak value of the S-wave veloc.

• 试验结果表明:不论应力应变曲线上的直线部分是否明显,都可以用检测横波速度最大值的办法确定岩石的应力门槛值;并建议对求岩石泊松比的常规方法有必要进行重新调整。