利用裂隙的亚临界扩展理论对底板滞后突水现象进行了分析。
The phenomenon of the lagging water bursting is explained applying crevice inferior critical spreading .
结果表明：混凝土断裂是一个复杂的不规则过程，存在明显的亚临界扩展现象。
It is shown that the fracture of concrete behaved complicatedly and irregularly, which underwent explicitly a subcritical crack growth prior to the unstable crack propagation.
但是，声发射信号的起始点并不是主裂纹起裂点，失稳前阶段也不能与亚临界扩展阶段等同。
But the beginning of the acoustic emission sign is not the cracking point of main crack, and the preinstability stage may not be equal to the subcritical growth stage.
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