爆破振动对砖石古塔的动力影响测试分析

TESTS AND ANALYSIS OF BLASTING VIBRATION EFFECTS ON THE ANCIENT MASONRY TOWER

采用动态测试分析系统实测递增药量试爆破激励下某一砖石古塔的振动响应,并对实测数据进行时域与频域上的分析。结果显示塔身和塔基测点的最大响应幅值与单孔药量存在正相关关系,与爆破孔间间隔存在负相关关系。塔基竖向振动响应随着单孔药量水平的增大而逐渐接近并大于水平振动响应,而塔身横、竖向振动响应大小基本一致。最后参照有关标准,用实测最大塔体振动响应来评估结构在爆破振动激励下的安全性,为确定施工爆破的安装药量提供依据,并为控制爆破振动对砖石古塔影响提供有价值的参考,也可供其他类似工程参考。

The vibration response of an ancient brisk tower which is excited by trial blasts with increasing explosive charges was measured using dynamic test and analysis system. The testing data was analyzed in time domain and frequency domain, respectively. Results show that the maximum response amplitude of tower body and foundation is positive correlated with single hole charge and is negative correlated with the time interval of blasting. It is found that as the single hole charge increases, the vertical vibration response of tower foundation is gradually approaching and then greater than the horizontal vibration response. However, the vertical vibration response of tower body is almost consistent with the horizontal vibration response as the single holes charge increases. According to relevant regulations, the maximum vibration response of tower is used to evaluate the structure safety under the excitation of trial blasts. The quantity of charge for construction blasting can be determined by the maximum vibration response, which can provide valuable reference for controlling the influence that blasting vibration creates on ancient masonry tower or other similar projects.