地铁钻爆法施工对邻近建筑物的振动响应预测

钻爆法施工对邻近建筑物的振动响应预测是制定施工安全措施及预警的重要依据。以青岛地铁4号线某车站32炮次43个监测数据为例,利用实测数据分析了爆破振动速度传播规律,分别选用经验公式与灰色模型预测钻爆法施工对邻近建筑物的振动峰值速度,并分析对比所建模型的精度以及对爆破振动传播规律适应性。结果表明:本次工程中,爆破振动速度传播具有明显的距离效应与空洞效应,高程效应不显著;对于预测模型的分析对比认为两者对于爆破振动传播规律的反馈不同,灰色模型更能体现空洞效应,对近距离、短时间爆破监测点的数据预测具有较高的精度;而经验公式更能反馈距离效应,对长时间、长距离的爆破振动预测更具有优势。

Prediction of Vibration Response of Adjacent Buildings by Subway Drilling and Explosion Method

The prediction of vibration response to adjacent buildings by drilling and blasting method is an important basis for the development of construction safety measures and warning. Taking the monitoring data of 32 explosion steps at a station of Qingdao Metro Line 4 as an example, this paper analyzed the velocity propagation law of blasting vibration with the empirical formula and the grey model to predict the peak vibration velocity of nearby buildings. The precision of the model and its adaptability to the propagation law of blasting vibration were analyzed and compared. The results show that the velocity propagation of blasting vibration has obvious distance effect and void effect, but the elevation effect is not obvious; the grey model can reflect the void effect better, and has higher accuracy in the prediction of the data of the monitoring points of close distance and short time blasting, the empirical formula can better feedback the distance effect, and has more advantages for the long-time and long-distance blasting vibration prediction.