装药爆炸临界震塌爆距的计算分析

运用分段插值函数来表达石质坑道震塌计算经验公式中的爆距与洞跨径比影响系数，给出了隧道工程临界震塌爆距的实用计算方法；通过回归分析，得出了结构动、静载荷段交界点临界震塌爆距爆炸角的计算公式，可用于工程中区分结构动、静载荷段，以及确定结构最小安全防护层厚度。该方法计算过程简单，计算精度与原公式一致，并对在GBU-28装药爆炸作用下，一至四类围岩隧道工程震塌爆距进行了分析研究，得出了一些有益的结论，可供有关科研及工程实践参考。

Calculation method for critical distance of tunneling engineering exploded to collapse by charge explosion

This article makes use of subsection function to express the influence coefficient of the ratio of the explosion distance and the sap span,and then provides an applied calculation method for the vertical critical explosion distance of tunneling engineering exploded to collapse.Using regressive analysis,the formula of the critical explosion distance and the critical explosion angle of collapse at the boarder point are derived.It can be used to distinguish between static section and dynamic section,and to obtain the minimal depth of the defense cover.The formulae is simpler than the original formulae,while the accuracy is of the same.Under the research and analysis of the vertical critical explosion distance of tunneling engineering of the first type to the forth type surrounding rock exploded to collapse by the deep penetrating projectile GBU-28,the article draws some conclusions that can provides reference for relational scientific research and project practice.