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裂隙传播速率裂隙前端的移动速度，单位为:m/s。裂隙传播速度取决于岩石或岩体的物理、力学和其他特性，在0到瑞利波 〈Rayleigh〉波速之间变动。最高测量值为声速的38%。特定条件下在石灰岩中测到了更大的传播速度
expl. crack propagation velocity

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