爆炸荷载下泡沫混凝土减振层动力响应分析  

Analysis of dynamic response of foam concrete damping layer under explosive load

作　　者：袁英杰 孙惠香[1] 陈卓[1] YUAN Ying-jie;SUN Hui-xiang;CHEN Zhuo(Aeronautical Engineering College,Air Force Engineering University,Xi'an 710038,China)

机构地区：[1]空军工程大学航空工程学院,西安710038

出　　处：《工程爆破》2021年第4期51-57,共7页Engineering Blasting

基　　金：国家自然科学基金资助项目:爆炸荷载作用下大型地下洞室围岩动力稳定性智能仿真关键技术研究(51208506)。

摘　　要：为研究爆炸荷载下泡沫混凝土减振层厚度对岩体拱结构的减振性能影响,基于ANSYS/LS-DYNA动力有限元分析软件,建立炸药-空气-结构流固耦合模型,在岩体与衬砌间设置0、0.2、0.4、0.6、0.8、1.0、1.2 m不同厚度泡沫混凝土减振层。应用流固耦合算法对比分析了衬砌外层拱顶、拱肩和拱脚单元最大有效应力、峰值压力及峰值位移。拱顶上方单元压力与TMB5-855-1公式吻合良好,验证了模型有效性。数值模拟结果表明:设置减振层后拱顶、拱肩和拱脚最大有效应力变小,拱脚减少超过80%;随减振层厚度增加,拱顶、拱肩和拱脚峰值压力减小,峰值位移增加,当厚度超过0.6 m,减振抗爆效果不明显,峰值位移趋于稳定;拱顶作为响应强烈部位,应采取加固措施;综合考虑经济因素,建议设置0.6 m厚减振层。In order to study the influence of foam concrete layer thickness on the damping performance of rock arch structure under explosive load,based on the ANSYS/LS-DYNA dynamic finite element analysis software,a fluid-solid coupling model of explosive-air-structure was established.Between the rockmass and the lining,seven different thicknesses of foam concrete damping layers are set at 0,0.2,0.4,0.6,0.8,1.0,1.2 m.The fluid-solid coupling algorithm is used to compare and analyze the maximum unit effective stress,the peak pressure and the peak displacement of the outer lining dome,the arch shoulder and the arch toe.The unit pressure above the vault is in good agreement with the TMB5-855-1 formula,which verifies the validity of the model.Numerical simulation results show that the maximum effective stress on the arch,the arch shoulder and the arch foot decreases after setting the vibration damping layer,and the stress on the arch foot reduces by more than 80%;with the increase of the thickness of the vibration damping layer,the peak pressure on the arch,the arch shoulder and the arch foot decreases,and the peak displacements increase.When the thickness exceeds 0.6 m,the damping and anti-blast effect is not obvious,and the peak displacements tend to be stable;the vault is a strong response part,and reinforcement measures should be taken.Comprehensively considering the economic factor,it is recommended to set a 0.6 m thick damping layer.

关 键 词：爆炸荷载 有限元分析 泡沫混凝土减振层 动力响应 

分 类 号：TD235[矿业工程—矿井建设]