平整壁面通道内冲击波传播试验研究

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中图分类号：0382;E952 国标学科代码：1303520 文献标志码：A

Experimental study on the propagation of shock wave in the channel with flat wall

WANG Zhen，LI Xilai，LI Hujun （Nanjing University ofScience and Technology，Nanjing21oo94，Jiangsu， China）

Abstract：To investigate the propagation processofshock waves within achannelunder diferent explosive yieldsandcharge positions，this studyestablishedan experimental channel designed for individual soldier transit.Through experimetsand simulations，itis foundthatthequantityand positionofthecharge afectthe timehistoryofoverpresureand shock wave parameters. Within the tunnel，the propagationvelocityand overpressure peak ofthe shock wave decreased with increasing of distance，while the duration and impulse of positive overpressure continuously extend and increase.When the charge equivalentincreases，allshockwaveparametersareehanced，thoughtheinfluenceontherateofoverpressurepeakatuation is minimal.Asthedistancebetweentheexplosioncenterandthe interiorof thetunnelincreases，allparameters decline.Both experiments and simulations reveal aunique change in the time historyofoverpressureand shock wave parameters near the 9m measurement point inside the tunel.Byanalyzing pressurecontour mapsandoverpressure time history，it is discovered that wavefront movement is the primary cause. Based onthe fundamental shock wave theory，a higher overpresure peak of shock wave results in faster wavefront motion. From the 3m to 7m section inside the entrance， the leading Wavefront overpressurecontinuouslyatenuates with increasing distance，andits motionspeed significantlydecreases.However，the overpressure values of subsequentreflected waves atenuate more slowlyor even exceed thoseof the leading wavefront due to continuous collision and superposition. Between the 7m and 9m sections inside the entrance， the reflected waves formed by later superposition catch up with and overlapthe leading wavefront，resulting in an increase in the first peak value with increasing distance.This processisalsoclearlyunderstood through the simulated overpressure contour map.Basedonthe experimentalandnumericalsimulationresults，apredictivemodelforshockwaveoverpressre withinthechannel，whichhas practical engineering reference significance， has been developed.

Keywords： explosion shock wave; tunnel; shock wave propagation; attenuation mechanism

隧道工程作为交通运输的关键节点，是国防工程实现其战略战术目的的重要保障。（剩余16246字）