坑道内冲击波冲量传播规律的试验研究

为获得坑道中冲击波冲量的传播规律,共进行了20次坑口外装药比例模型爆炸试验.模型坑道为等截面钢筋混凝土直墙圆拱结构,截面积为0.67m2,TNT炸药的装药量范围为1000g～4600g.用压力传感器记录了坑道中的冲击波波形,分析了实测的冲击波波形和冲击波冲量的传播规律,由实测数据拟合出了装药在坑口外爆炸情况下,冲击波冲量沿着等截面直坑道传播的工程经验模型.算例分析表明,该文提出的冲击波冲量工程经验模型具有一定的应用价值.

Scale Model Tests to Determine Blast Impulse from HE-charges In-tunnel

In order to obtain the propagation law of blast impulse in-tunnel ,twenty scale high-explosive experiments are conducted for external detonations. The concrete model tunnel cross section is 0. 67 m^2,explosive charges of TNT range in mass from 1000 grams to 4600 grams. The blast waveforms in-tunnel is recorded with pressure transducer. The measured blast waveforms and its propagation law are analyzed. An engineering empirical model for predicting blast impulse propagating along the straight tunnel with constant cross-section is presented for detonations occurring outside the entrance tunnel and is evaluated against the results from other methods. It is found that the engineering empirical model presented by this paper is reasonably accurate for in-tunnel impulse prediction,