摘要
针对目前爆破施工对既有建(构)筑物影响的数值分析方法及振动安全判据中存在的爆破荷载施加复杂、计算难以收敛,仅以质点振动速度大小单一指标作为安全判据等问题,利用圣维南荷载等效原理,经过推导提出了数值分析中爆破荷载的等效施加方法,即将作用在炮孔壁上的孔状爆破荷载等效成面荷载,以模拟爆炸作用,这种方法使得数值建模简化且计算容易收敛,同时基于拟静力法给出了新的振动安全判据。最后利用两个具体的工程案例对等效荷载施加方法和新安全判据的合理性进行验证。结果表明,等效荷载施加方法在近区存在一定差异,但在中远区吻合得较好,该方法建模简单,且计算容易收敛;新的爆破振动安全判据考虑了建(构)筑物本身的自振频率和安全储备,能够合理地评价振动荷载对既有建(构)筑物的影响,可供类似工程参考。
According to some problems in the numerical model and safety criterion of the influence of blasting construction on buildings and structures,such as the complexity of load application in modeling process and considering the particle vibration velocity as safety criterion singly. The equivalent load application method and new safety criterion of blasting vibration are proposed based on Saint-Venant principle and pseudo-static method respectively,that is,applying the blasting load which is equivalent after acted on the blast hole wall to the line or surface of centers of the same blast hole row to simulate the blasting effects. and the rationality of them are verified through two practical cases. The results show that the equivalent load application method has some differences in the vicinity but better fit in further zone,and it is simple in modeling process and the convergence of calculation is fast. The natural frequency and emergency capacity of buildings and structures are considered in the new safety criterion of blasting vibration,which makes the influence of blasting vibration on buildings and structures can be evaluated reasonably. It can provide a reference for similar projects.
出处
《土木工程学报》
EI
CSCD
北大核心
2015年第S2期22-29,共8页
China Civil Engineering Journal
基金
国家自然科学基金项目(51378131)
广东省水利科技创新基金项目(2009-25)
广东省公路管理局科技基金项目(2012-09)
关键词
爆破振动
等效荷载
安全判据
振速
拟静力
数值仿真
blasting vibration
equivalent load
safety criterion
vibration velocity
pseudo-static
numerical simulation
