基坑爆破施工对邻近建筑物的动力响应研究

以深圳地铁某车站基坑开挖遇硬岩爆破施工为工程背景,分析了基坑爆破开挖对邻近建筑物的震动加速度及速度响应规律。结果表明:爆破施工引起会引起邻近建筑物的震动,建筑物的最大震动响应出现在炸药爆破过程中,随后逐步衰减致稳定。震动沿建筑物各个方向的响应增长或衰减情况有所差异,震动响应随着程高增加而增大,随着水平X方向距离和水平Y方向距离增加而减小;且水平Y方向响应衰减程度大于水平X方向;该建筑物各个监测点的震动速度均在工程安全规定范围内,在车站基坑爆破过程中处于安全状态。

Study on Dynamic Response of Foundation Pit Blasting Construction to Adjacent Buildings

The vibration acceleration and velocity response law of foundation pit excavation on nearby buildings were analyzed by taking the excavation of a subway station for hard rock in Shenzhen Metro as an engineering background. The results show that blasting construction causes the vibration of adjacent buildings, the maximum vibration response of buildings occurs in the process of explosive demolition, and then gradually attenuates to stabilize. The response growth or attenuation of vibration along all directions of the building is different. The vibration response increases with the increase of the height, and decreases with the increase of horizontal X distance and horizontal Y direction distance, and the attenuation degree of horizontal Y direction response is greater than that of horizontal X direction. The vibration speed of each monitoring point in the building is within the scope of the safety regulation of the project, and it is in a safe state during the blasting process of the station foundation pit.