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从煤层开采引起底板破坏一般规律出发， 探讨了底板岩体破坏与声波速度场的响应关系， 介绍了声波ＣＴ探测的原理与方法， 按采矿活动的关键阶段设计观测方案， 进行了试采面底板破坏深度的动态声波ＣＴ 探测试验． 采用纵波速度作为反演参量， 纵波速度的变化反映底板岩体的受力状态、结构变化以及破坏程度． 选用联合迭代重建方法（ＳＩＲＴ 法） 进行速度反演． 试验结果表明： 声波ＣＴ 能从空间角度动态探测底板破坏深度， 探测结果直观准确， 效果可靠．
Based on the general law of floor damage caused by coal mining, the relationship between the failure of floor rock mass and the acoustic velocity field was discussed. The principle and method of sound wave CT detection were introduced. The observation program was designed according to the key stage of mining activity. Destructive depth of dynamic sonic CT detection test. Using the P-wave velocity as the inversion parameter, the change of P-wave velocity reflects the stress state, structural change and failure degree of the floor rock mass. The joint iterative reconstruction method (SIRT method) is used to perform velocity inversion. The experimental results show that acoustic wave CT can dynamically detect the failure depth of the floor from the perspective of space, and the detection results are intuitive and accurate with reliable results.