防护门破坏后剩余冲击波传播规律的试验

Model tests to determine In-tunnel blast leakage with protective doors destruction

现代精确打击条件下坑道中的防护门面临被直接破坏的威胁。为了获得防护门破坏后剩余冲击波的传播规律,共进行了4次模型坑道中防护门堵口爆炸破坏试验。钢筋混凝土模型坑道截面积为0.67 m^2,TNT炸药的装药量范围为1.0～4.6 kg。钢筋混凝土防护门厚度为8 cm,配筋率0.2%,混凝土等级C 30。用坑道侧墙上的压力传感器记录了防护门破坏后剩余冲击波的波形,分析了剩余冲击波在坑道中的传播规律。研究成果可供工程设计参考。

In-tunnel protective doors are faced with the direct destruction from modern precision guided munitions. In order to obtain the propagation law of in-tunnel blast leakage with protective door destruction, four protective doors high-explosive experiments in the model tunnel were conducted for the tunnel entrance detonations. The cross section area of the reinforced concrete model tunnel is 0.67 m^2, and explosive charges of TNT range in mass from 1.0 kilograms to 4.6 kilograms. The thickness of the reinforced concrete protective door is 8 cm, with steel ratio 0.2%. The compressive strength grade of the concrete used to simulate the protective door is 30 MPa. Blast gages were flush-mounted in the wall of the model tunnel sections to record side-on blast pressure as it propagated down the tunnel after the protective door was destroyed. The measured in-tunnel leaking blast waves were analyzed, and the results offer valuable reference to engineering design.