【摘要】 利用FLAC3D软件模拟了露天爆破荷载作用下地下洞室群的动态响应.采用IDTS3850测试仪实测爆破振动数据,利用萨道夫斯基经验公式计算在最大装药量和最短爆心距情况下的爆破振动参数;将速度时程转换为应力时程,并利用FLAC3D内置的Fish函数,通过在边界节点或内部节点上输入动力荷载时程来实现动力加载,然后从塑性区、位移和应力方面对动力模拟和静力分析结果进行比较,得出动力荷载对洞室群稳定性的影响状况.研究表明:爆破振动会加大洞室群的竖直位移,尤其是洞室间交叉区域的位移;施加动力荷载后,对静力作用下所产生的应力集中有一定的卸荷作用,还会增大洞室壁的片帮,但不会使洞室群整体破坏.更多还原

【Abstract】 The dynamic response of underground caverns under open blasting loads was simulated with FLAC3D software.On the basis of data from seismic waves measured with an IDTS3850 tester,blasting vibration parameters in the case of the maximal charge amount of explosives and the shortest blasting distance were calculated with Sadowsky’s empirical formula.By conversion of the velocity-time history into the stress-time history and by use of the Fish function built-in FLAC3D software,dynamic loading was carried out by inputting the dynamic load-time history at boundary nodes or internal nodes.After comparison between the dynamic simulation and static analysis of plastic zones,displacement and stress,the corresponding impact of dynamic loads on the stability of caverns was assessed.It is shown that blasting vibrations can magnify the vertical displacement of caverns,especially in intersect zones,and on the other hand,the stress concentration under static action is alleviated when a dynamic load is applied.Besides,it also aggravates the wall fall of cavities,but cannot result in overall destruction.更多还原