层状黑云变粒岩的波速模型及声发射定位新方法

为了提高层状黑云变粒岩破坏过程中声发射源的定位精度，建立了一种适用于该类岩石的各向异性波速声发射源定位方法。首先，通过波速测量结果构建了各向异性波速模型；然后,建立声发射定位目标函数，并采用直接网格搜索法进行优化求解；最后,通过单轴压缩条件下的层状黑云变粒岩声发射实验，对单一波速的传统定位法和该定位方法进行了验证。研究结果表明：该定位方法具有较高的精度，误差较单一波速的传统定位法减少了约4 mm，可以为研究层状黑云变粒岩破裂过程中裂纹时空演化规律提供技术基础。

Wave Velocity Model and New Acoustic Emission Positioning Method of Layered Biotite Granulite

In order to improve the positioning accuracy of acoustic emission during the failure process of layered biotite granulite,a positioning method that is suitable for the anisotropic wave velocity of layered biotite granulite is proposed. Firstly, the anisotropy wave velocity model is established based on the wave velocity measurement results;then,the acoustic emission positioning target function is built,and it is conducted optimization calculation by using direct grid search method;finally,the positioning effects of the new method proposed in this paper and traditional positioning method are verified by conducting a-coustic emission test of layered biotite granulite under the uniaxial compression condition. The study results show that the posi-tioning error is 4 mm lower than the one of the traditional positioning method with signal wave velocity,and it can provide the technical basis for analyzing the temporal and spatial evolution regularities of the cracks during the failure process of layered biotite granulite.