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在实验室对房山花岗岩进行单轴压缩加载,通过布设在岩石四周的26个超声波探头,在不同变形阶段,观测了岩石的超声波速度,反演了P波速度结构。速度成像结果显示,在压实和线弹性变形阶段,P波速度逐步全局升高。最终失稳破裂前,高速区域范围逐渐收缩,同时,形成条带低速带,最终失稳破裂发生在低速带上。
The uniaxial compressive loading of Fangshan granite was carried out in the laboratory. The ultrasonic velocity of rock was observed at different deformation stages through 26 ultrasonic probes arranged around the rock, and the P wave velocity structure was inverted. The velocity imaging results show that the P-wave velocity gradually increases globally during the compaction and linear elastic deformation stages. Before the final collapse, the high-speed region shrinks gradually. At the same time, the low-speed belt forms and the final failure occurs in the low-speed belt.