For the accurate design of geotechnical structures subjected to static and dynamic loadings, precise estimation of elastic wave velocities and hence, small strain stiffness of soil is essential. However, the interpretation of elastic wave velocities propagating in deformed/sheared soil has not been comprehensively explored. In this research, shear (V_s) and compression wave velocity (V_p) measurements have been undertaken on three kinds of uniformly graded sands during drained triaxial compression by keeping minor principal stress constant. Planar piezoelectric transducers have been used to overcome the limitations associated with the more commonly used bender elements, such as distortion of transducers during specimen shearing. This technical note reveals that the increase of major principal stress in the wave propagation direction has a more significant influence on V_p in comparison to V_s. The axial strain (ε_a) at which peak V_s is noted is comparable to the ε_a at which specimen dilation or phase transformation takes place. The V_s values show a substantial drop after phase transformation, although there is an increase in the mean stress level. However, V_p increases even after specimen dilation takes place, and it is the major principal stress that dictates its evolution during triaxial compression. Moreover, for a given material and initial stress level, elastic wave velocities of specimens prepared at different initial densities approach one another during shearing and later merge at a large ε_a.

为了对承受静态和动态载荷的岩土结构进行精确设计，精确估计弹性波速度以及因此较小的土应变刚度是必不可少的。但是，尚未全面探讨在变形/剪切土中传播的弹性波速度的解释。在这项研究中，剪切力（V _s）和压缩波速度（V _p在排水三轴压缩过程中，通过保持较小的主应力恒定，对三种均匀梯度的砂子进行了测量。平面压电换能器已经被用来克服与更常用的弯曲器元件相关的限制，例如在样品剪切期间换能器的变形。该技术说明表明，与V _s相比，主主应力在波传播方向上的增加对V _p的影响更大。轴向应变（ε_一个在该峰）V_小号注意比得上ε_一个在此发生样品膨胀或相变。的V_小号值显示相变后大幅下降，虽然有在平均应力水平的增加。但是，即使在试样膨胀后，V _p也会增加，这是决定三轴压缩过程中演变的主要主应力。此外，对于给定的材料和初始应力水平，标本弹性波速度在不同的初始密度制备在一个大的剪切和后来合并期间彼此接近ε_一个。