坑道口部Ｂ炸药爆炸冲击波传播速度模型试验研究

准确计算口部内爆炸条件下坑道中冲击波传播速度的变化规律，是坑道工程中防护设施抗精确打击设计的前提。为此，在野外进行１０次模型坑道内爆炸试验。模型坑道由可拼装式钢结构单元组成，净截面积为６０ｃｍ×６０ｃｍ，Ｂ炸药装药量范围为７５ｇ～５００ｇ。通过安装于坑道侧壁上的压力传感器实测冲击波波形，由实测数据拟合出坑道口部内爆炸条件下冲击波沿等截面直坑道传播的速度模型。算例分析表明，所拟合的坑道内冲击波传播速度的工程经验模型具有较高实用价值。

Scale model tests to determine in-tunnel blast impact wave velocity for B-charges at tunnel entrance

Determination of in-tunnel blast impact wave velocity is a basis of design for blast facilities to resist impact of precision guided munitions.Ten high-explosive scale model tests were conducted for B-detonations at a model tunnel entrance.The cross section of the model steel tunnel element was 60cm×60cm,B-explosive charges mass from 75 grams to 500 grams.Pressure sensors were mounted on the wall of the model tunnel to record side-on blast impact wave shape as it propagated along the tunnel.The measured in-tunnel blast impact wave curves were analyzed,an engineering empirical model for predicting in-tunnel blast impact wave velocity was fitted for B-detonations at the entrance of a straight model tunnel with constant cross-section.The numerical example showed that the engineering empirical model proposed here is reasonably accurate.