The domino effect threshold is the limit value of physical parameter on destructive effect, and the evaluation criterion to determine whether it can trigger domino effect, the beginning of quantitative risk assessment on domino effect. On base of the analysis of domino effect at home and abroad, domino effect and its threshold were introduced. Three thresholds of physical effect (thermal radiation threshold, overpressure threshold and fragment threshold) to cause domino accident were summarized in this paper.%多米诺效应阈值是表征破坏效应相关物理参数的限值,是判断是否会引发多米诺效应的评判准则,是多米诺效应定量评价的开端.在对国内外多米诺效应研究成果分析的基础上,介绍了多米诺效应及其阈值,综述了引发多米诺事故扩张的三种物理效应阈值(即:热辐射阈值、超压阈值和碎片阈值)的研究现状.
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