爆炸荷载作用下大型箱涵安全性的SPH-FEM耦合分析

Coupled SPH-FEM for Safety Analysis of Large-Scale Box Culvert Under Blasting Load

爆炸冲击荷载对地下结构物影响是工程界关注的重点问题.采用SPH与FEM耦合的数值分析技术,SPH法用于模拟爆破近域的土体大变形,FEM法用于模拟远场土体和结构物响应,研究了爆炸冲击荷载对大型输水箱涵安全性的影响,研究结果表明:SPH与FEM耦合分析技术可以满足计算精度与计算效率要求,计算结果较好地揭示了爆坑形成和冲击荷载的传播过程;不同爆炸位置下箱涵受力和变形存在较大差异,尤其是边墙中间位置,受土体变形流动影响,不同爆炸位置会引起明显的二次加载和拉压变化.

The response of underground structures to blast loading is an important topic in civil engineering.A fully coupled SPH-FEM numerical analysis technology was used to simulate the response of a large-scale box culvert under blasting load,in which SPH method was adopted to model the great deformation of near field soil,while FEM was used to model the far field soil and structure response.The results show that the coupled SPH-FEM analysis technology can achieve calculation accuracy and efficiency,and the simulation results present formation of crater and propagation process of impulse wave.There is an obvious difference in stress and deformation of box culvert under different locations of detonation.Especially at the central position of wall,there is an obvious effect of soil flow on reload and change of stress under different locations of detonation.