论文部分内容阅读
以上海市某大型基坑内支撑机械拆除为例,在大量振动监测的基础上,研究了基坑内支撑机械拆除过程中产生的振动在基坑内部和基坑边缘挡土墙、高层建筑物竖直方向上的传播规律,监测同时考虑了临近建筑对机械振动的动力响应。研究表明:机械拆除基坑内支撑对周围建筑物所产生的振动速度较小,不足以影响构筑物结构安全,但由于振动信号的主频较低,接近于建筑物的固有频率,地震效应仍应该引起足够重视;利用小波包技术可得到振动信号各频带上的能量分布,从能量角度研究振动信号可以直观地了解信号在传播过程中的衰减特性。
Taking the dismantlement of supporting machinery in a large foundation pit in Shanghai as an example, on the basis of a great deal of vibration monitoring, the vibration of the supporting machinery in foundation pit was studied in the foundation pit and the retaining wall on the edge of foundation pit, The direction of propagation, monitoring also takes into account the dynamic response of adjacent buildings to mechanical vibration. The results show that the vibration velocity of the support within the foundation pit by mechanical removal is not enough to affect the structural safety of the structures. However, the seismic effect should still be caused by the low fundamental frequency of the vibration signal and close to the natural frequency of the building And pay enough attention to it. Using the wavelet packet technique, the energy distribution of each band of the vibration signal can be obtained. From the energy point of view, the vibration signal can intuitively understand the attenuation characteristics of the signal in the propagation process.