%0 Journal Article
%T 岩石破坏过程中波速变化特征
%A 张鹏海
%A 杨天鸿
%A 赵永川
%A 夏冬
%J 东北大学学报（自然科学版）
%D 2015
%R 10.12068/j.issn.1005-3026.2015.01.029
%X 摘要 在单轴阶段加载条件下，对取自闽南地区的闪长岩岩样进行了不同方向上纵波传播速度的测试.首先根据实验结果总结出不同方向波速在岩石破裂过程中的变化规律，然后基于应力微小变化范围内波速与应力遵循线性关系的假设构建波速-应力关系模型，最后通过多参数分段拟合方式求解模型待定系数.研究结果表明:平行于加载方向的波速在压密阶段快速上升，岩石破裂前的波速降不明显.而垂直于荷载方向的波速在压密阶段少量上升后在临近岩石破裂出现非常明显的波速降.波速-应力关系模型通过参数的变化可以准确地描述不同方向波速的变化过程，证明了模型的适用性.</br>Abstract：Under uniaxial multi-level loading condition， the longitudinal wave velocities in different directions from south Fujian diorite were measured.Firstly， based on the experiment results， the changes of wave velocities with stress were analyzed. And then according to the hypothesis of the linear relationship between wave velocity and stress in a very small range of stress， a wave velocity-stress model was built.In the end， using the multi-parameter piecewise fitting， undetermined coefficients in the model were determined. The results showed that the variation of wave velocity paralleled to the loading direction is characterized by an initial instant and nonlinear rise below a critical stress， followed by a more gradual linear increase above this critical stress， and the decrease is not obvious before the failure. Whereas， the variation of wave velocity perpendicular to the loading direction is characterized by a slightly rise below a critical stress， followed by an accelerated decrease above this critical stress， and the decrease is very obvious before the failure. The variation of wave velocities in different directions can be accurately fitted by the wave velocity-stress model， which confirms the applicability of the model.
%K 单轴多阶段加载
%K 波速
%K 岩石破裂
%K 裂纹演化
%K 波速-应力模型&lt
%K /br&gt
%K Key words： uniaxial multi-level loading wave velocity rock failure crack evolution wave velocity-stress model
%U http://xuebao.neu.edu.cn/natural/CN/abstract/abstract6770.shtml