紧邻地下结构拆除爆破工程的缓冲减振措施

Vibration reduction measures of demolition blasting project adjacent to underground structures

铁四院前大楼爆破工程紧邻浅埋地下室结构,大楼倒塌触地冲击振动对邻近地下室可能造成严重影响。为保护地下结构的安全性,采用有限元数值模拟方法ANSYS/LS-DYNA,分析了楼房倒塌时2.0、2.5、3.0 m高沙堤和3.0 m高沙堤+1.5 m深减振沟4种方案的减振效果,同时考虑施工难度和经济性,最终确定了3.0 m高梯形截面沙堤的减振方案。爆破结果表明,采用多排小间距高沙堤可有效降低楼房倒塌冲击荷载和振动,保障了邻近地下室的安全。

The front building of Tie-Si-Yuan was adjacent to the shallow basement structure.When the building was demolished by blasting,the adjacent basement might be damaged by shock and vibration.In order to protect the underground structure,the influence of the collapsing building on the basement was analyzed by using finite element method(ANSYS/LS-DYNA).Four vibration reduction plans are analyzed,including 2.0,2.5,3.0 m high sand ridge and 3.0 m high sand ridge with 1.5 m depth damping ditch.The vibration reduction plan of 3.0 m trapezoidal section sand ridge was adopted.The blasting results showed that the impact load and vibration of building collapse could be reduced by multiple rows of small spacing sand ridges and ensuring the safety of the adjacent basement.