论文部分内容阅读
针对地铁环境振动预测评价体系的施工设计阶段的预测,提出了一种通过隧道内脉冲激励实测地表系列频响函数的预测方法。将地铁环境振动预测问题转化为两部分:构建高精度车轨耦合解析模型求解作用于基底的频率力;隧道内进行脉冲激励实测隧道-土层系统的地表频响函数列。将两部分在频域内进行叠加运算求得地铁列车引起的环境振动响应,并形成科学的预测流程通过MATLAB程序实现。在18m埋深的隧道内部进行锤击实测地表频响函数带入预测流程进行地表振动响应预测,选取15号线类似条件地点的地表加速度实测数据进行对比验证,结果表明:预测结果和现场实测时域峰值均为0.02m/s2,振动主频均为30Hz~80Hz,1/3倍频程及Z振级也非常相近,预测精度及频谱特性良好。
Aiming at the prediction of construction design stage of metro environment vibration prediction and evaluation system, a method of forecasting the frequency response function of surface series measured by pulse excitation in tunnel is proposed. The subway environment vibration prediction problem is transformed into two parts: building a high-precision rail-coupled analytical model to solve the frequency force acting on the substrate; and performing pulse excitation in the tunnel to measure the surface frequency response function of the tunnel-soil system. The two parts in the frequency domain overlay operation to obtain the subway train caused by environmental vibration response, and the formation of a scientific prediction process through the MATLAB program. In the 18m deep tunnel, the surface acoustic response function of hammer measured ground surface is introduced into the prediction process to predict the surface vibration response. The surface acceleration data of the 15th line are selected for comparison. The results show that when the prediction result and field measurement The domain peak value is 0.02m / s2, the dominant frequency of vibration is 30Hz ~ 80Hz, 1/3 octave band and Z vibration level are also very similar, and the prediction accuracy and spectrum characteristics are good.