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材料破坏准则的采用是制约动态层裂机制研究的主要因素之一。采用一维弹脆性平面波理论,运用累积损伤破坏准则对因爆炸或冲击引起的层裂问题进行分析。解析了三角形脉冲荷载在考虑升压时间时第1次层裂厚度的变化规律。研究表明:考虑升压时间时得出的层裂片厚度比不考虑升压时间时要小,运用累积损伤破坏准则计算出的层裂片厚度比最大拉应力瞬时断裂准则的计算值大。分析结果对研究地冲击荷载作用下地下洞室的震塌破坏有一定的参考价值。
The adoption of material failure criterion is one of the main factors that restrict the research of dynamic layer-break mechanism. The one-dimensional elastic-brittle plane wave theory is used to analyze the delamination problem caused by explosion or impact by using the cumulative damage damage criterion. The variation law of the first delamination thickness of triangle impulsive load considering the time of boost is analyzed. The results show that the thickness of the delaminated layer is smaller than that when the pressure increasing time is not considered, and the thickness of the delaminated layer calculated by the cumulative damage failure criterion is larger than the calculated value of the maximum tensile stress instantaneous failure criterion. The result of the analysis is of certain reference value for the earthquake damage of the underground cavern under the impact load.