高架桥爆破坍塌全过程数值模拟与分析

摘要

大型城市高架桥的爆破拆除工程必须有一个严密的爆破方案，数值模拟可为爆破方案的制订提供有力保障。针对某城市大型高架桥梁的爆破工程，利用LS-DYNA程序，计算分析了高架桥的爆破坍塌全过程，分析了爆破过程及爆破拆除引起的地面振动响应，并与最终的实测数据进行了对比分析。实测数据与计算数据吻合较好，表明该模拟方法能较好地考虑爆破全过程，可在今后类似工程的计算分析中参考使用。%A rigorous scheme should be taken in advance before a viaduct demolition,and the numerical simula-tion provided effective method to evaluate the scheme. Focused on the blasting engineering of a large-scale city via-duct,the whole process of initiation and collapse were simulated by the program LS-DYNA. The vibration responses of soil surface caused by the blasting and collapse slump touchdown were discussed,and the calculated results fitted the test data well,which was helpful to the design of similar blasting engineering in future.