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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.
FLAC3D software was used to simulate the dynamic response of underground caverns under open-air blasting load.The blasting vibration data were measured by IDTS3850 tester and the blasting vibration parameters were calculated by using the empirical formula of Sadowssky at the maximum charge and shortest burst distance ; Transforming the velocity time history to the stress time history and using the built-in Fish function of FLAC3D to realize the dynamic loading by inputting the dynamic load time history on the boundary node or the internal node. Then, the dynamic simulation and The results of static analysis show that the influence of dynamic load on the stability of the cavern group is obtained.The results show that the blasting vibration will increase the vertical displacement of the cavern group, especially the displacement in the cross between the caverns. After the dynamic load is applied , The static stress generated by the concentration of a certain unloading effect, but also increase the cavern wall of the film to help, but will not make the cavern group as a whole to destroy.