Numerical investigation on the dynamic responses of rockfall impact onto a sand cushion
WANG Haisheng1，ZHANG Jinhua2，CHEN Li2，ZHANG Yadong2，LI Qiaosheng1
1.State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, China;
2.Engineering Research Center for Safety and Protection of Explosion & Impact of Ministry of Education, Southeast University, Nanjing 211189, China
摘要针对落石冲击砂垫层的动力响应问题，研究了压缩波在砂中的扩散角、衰减系数和冲击力传递系数，提出了砂中压缩波传播的锥杆模型，分析了压缩波在砂中传播过程和相互作用机理。首先，根据砂的力学特性，选用Soil and Foam模型，给出了参数计算方法，基于ANSYS/LS-DYNA软件开展了仿真计算，并与现有试验结果进行了对比验证。其次，采用数值研究方法，分析了落石冲击效应及压缩波传播规律，拟合得到了衰减系数随砂深度的关系式。最后，提出了锥杆模型，研究了压缩波在砂中传播、衰减及其相互作用机理。论文研究成果，对进一步分析落石冲击荷载下防落石结构的动力响应奠定了基础。
Abstract：Aiming at the dynamic response of rockfall impact sand cushion, the diffusion angle, attenuation coefficient and transfer coefficient of compression wave in sand were studied. A conical bar model of compression wave propagation in sand was proposed. The propagation process and interaction mechanism of compression waves in sand were investigated. Firstly, according to the mechanical properties of sand, the Soil and Foam model was selected, and the parameter calculation method was given. The numerical calculation was carried out with ANSYS / LS-DYNA software, and compared with the existing test results. Secondly, the impact effect of rockfall and the propagation law of compression wave were investigated by numerical research method. The fitting formula between attenuation coefficient and sand depth is obtained. Finally, a conical bar model was proposed to investigate the propagation, attenuation and interaction mechanism of compression wave in sand. The research results lay a foundation for further analysis of the dynamic response of rockfall prevention structure under rockfall impact load.
王海生1，张锦华2，陈力2，张亚栋2，李巧生1. 落石冲击砂垫层的动力响应数值分析[J]. 振动与冲击, 2022, 41(6): 86-96.
WANG Haisheng1，ZHANG Jinhua2，CHEN Li2，ZHANG Yadong2，LI Qiaosheng1. Numerical investigation on the dynamic responses of rockfall impact onto a sand cushion. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(6): 86-96.
