摘要
爆炸荷载作用下结构的动力响应一直是热点的研究课题,但是地下支护结构与围岩在爆炸荷载作用下的相互作用机理研究还很少,尤其是用实验方法进行研究还存在一定的困难。本文应用ANSYS/LS-DYNA非线性显式动力学有限元程序,采用流固耦合算法,对大跨度地下拱形结构在内部爆炸荷载作用下支护结构与围岩的相互作用机理进行研究。研究结果表明:结构峰值超压与经验公式计算的数据基本吻合;同等装药条件下,结构跨度大,由于距爆心较远,使得结构内力较小,但是较小扰动时围岩内力显著增大;由于跨度较大,使得拱脚成为结构受力的薄弱环节,设计中应采取加强措施。
The dynamic response of structure subjected to the blast load is always a hot study problem,but the investigation of the dynamic interaction between the underground supporting structure and rock is reported rarely which is difficult to be studied by a test method.The dynamic interaction mechanism was investigated by the nonlinear dynamic finite element program in ANSYS/LS-DYNA and the fluid-solid coupling algorithm.The investigated results show that the peak overpressure of the structure coincides better with the data obtained from experience formula;under the same explosive volume,the inner stress of the structure decreases because of the large span,the smaller turbulence results in the large stress in the rock obviously;the arch foot becomes the weak chain because of the large span,which must be reinforced in design.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2009年第S2期107-110,共4页
Acta Armamentarii
关键词
内爆炸
大跨度地下结构
数值模拟
动力相互作用
internal blast
large span underground structure
numerical simulation
dynamic interaction
