颗珠山爆破边载对东海大桥动力响应分析

Analysis on Dynamic Respond to Donghai Bridge Subjected to Blasting Load of Kezhushan

施工爆破往往对既有的临近建筑物的影响很大,针对这种边载效应可能造成的危害,结合爆破数值模拟中爆破荷载的特点,基于圣维南原理,将作用在炮孔壁上的爆破荷载等效后,施加在同排炮孔联心线或者面上,以模拟爆炸作用。采用三维实体模型等效模拟计算分析了东海大桥在远场爆破施工对既有主体结构稳定性影响,计算了结构不同位置、不同工况的振动响应和不同距离的最大单响药量,在此基础上,分析了桥梁主体结构受爆破边载影响的危险区域,提出了不同距离的药量控制。

Usually,blasting engineering has great influence on adjacent buildings,for the edge load may cause some harm.Combined with the characteristics of the blasting loads in blasting numerical simulation,based on the Saint Venant＇s principle,the equivalent load is applied on the line of centers or the surface of blast hole in the same row to simulate explosion effect,after making the blasting load applied on the blast hole wall equivalent by the equivalent applying method of blasting load.Based on the equivalent load applying method,the three-dimensional entity model is used to calculate and analyze the effects of Donghai Bridge in the far field of blasting construction on the stability of existing structures.The largest single explosive charge of different positions,different working conditions and different vibration response are calculated.Based on the results,the authors analyze the dangerous area of bridge structure under the effects of blasting edge load,and put forward the control of blasting quantity in different distance.