分层岩土介质中的爆炸地冲击横向传播规律  

Transverse Propagation Law of Explosion Ground Shock in Layered Geotechnical Medium

作　　者：孙善政 王炜 刘渊 卢浩 赖杰 SUN Shanzheng;WANG Wei;LIU Yuan;LU Hao;LAI Jie(Rocket Force University of Engineering,Xi’an 710025,Shaanxi;State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact,Army Engineering University of PLA,Nanjing 210007,Jiangsu)

机构地区：[1]火箭军工程大学,陕西西安710025 [2]陆军工程大学爆炸冲击防灾减灾国家重点实验室,江苏南京210007

出　　处：《火箭军工程大学学报》2024年第6期12-22,共11页Journal of Rocket Force University of Engineering

基　　金：火箭军工程大学青年基金(2023QN-B024)。

摘　　要：基于连续介质应力波传播理论分析了分层岩土介质中爆炸地冲击波的反射机理,结合数值模拟计算结果,探究了爆点所在层中入射波、反射P波、反射SV波的叠加演化机制,参数化分析了不同的岩土介质参数对叠加波峰值的影响规律及机理。结果表明:推导得到的空气-岩土介质特殊工况下岩土介质中叠加波的计算方法与数值计算结果吻合较好;爆点所在层中临近介质交界面处叠加波峰值远大于入射波,而距交界面较远的位置,由于反射波的传播路径距离远大于入射波,叠加波的峰值与入射波相同,但会出现明显的二次波峰;在爆点所在层中临近介质交界面处,随着距爆点距离的增加,叠加波峰值与入射波峰值的比值先增加而后趋于稳定,稳定的峰值比与相邻介质的波阻抗相关,峰值比的区间为(1.60,1.98)。First,the reflection mechanism of explosion ground shock wave in layered geo-technical mediums was analyzed based on the theory of continuous medium stress wave propaga-tion.Then,the superposition evolution mechanism of incidence wave,reflected P wave and re-flected SV wave in the layer where the explosion point is located was explored combined with the results of numerical simulation.Furthermore,the influence law and mechanism of different geo-technical medium parameters on the peak value of superposed wave were analyzed.Results showed that the derived calculation method of superposed wave in air-geotechnical medium under special working conditions is in good agreement with the numerical calculation result.The peak value of the superposed wave at the interface of the adjacent medium in the layer where the ex-plosion point is located is much larger than the that of incident wave.Since the propagation dis-tance of the reflected wave is much larger than that of the incident wave,the peak value of the superposed wave is the same as that of the incident wave at a far distance from the interface,but there is an obvious secondary peak.At the interface of the adjacent medium in the layer where the explosion point is located,as the distance from the explosion point increases,the ratio of the peak value of the superposed wave to the peak value of the incident wave increases and then be-comes stable.The stable peak ratio is related to the wave impedance of the adjacent mediums,and the range of the peak ratio is 1.60 to 1.98.

关 键 词：岩土工程 地冲击传播规律 数值模拟 分层岩土介质 叠加演化 

分 类 号：O382[理学—流体力学]