地铁列车振动环境影响的深孔激振实测传递函数预测方法  

Prediction method of measured deep-hole excitation transfer function for environmental influence of metro train-induced vibration

作　　者：刘维宁[1] 陈嘉梁 吴宗臻[2] 王文斌[2] 

机构地区：[1]北京交通大学,北京100044 [2]中国铁道科学研究院,北京100081

出　　处：《土木工程学报》2017年第9期82-89,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(51278043;51608534);中国铁道科学研究院院基金(2016YJ154)

摘　　要：针对地铁列车振动环境影响的预测问题,提出了一种新型的深孔激振实测传递函数预测方法。本方法采用高精度车轨耦合解析模型求解振源输入力序列,通过现场原位深孔内激振实测获取地层振动传递函数序列,通过精细化有限元模型求解隧道结构修正函数序列,然后将3部分在频域内进行对应叠加运算求得地铁运行引起的地表振动响应。为了验证该预测方法,研制了可以用于深孔激振的新型设备,并在现场施工了15m埋深的激振孔,在其内部进行脉冲激励实测了地表传递函数序列,然后带入本方法预测流程进行地表振动响应预测。选取北京地铁某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0.08m/s^2,振动主频均为40~70Hz,1/3倍频程谱的量级和变化规律基本一致,Z振级接近。表明本预测方法预测精度高,频谱特性好,可以对地铁列车运行时的地表振动响应进行精确预测。For metro train-induced environmental vibration problems, a new prediction method of measured deep-hole excitation transfer function is proposed. Firstly, a vehicle-track coupling analysis model with high accuracy is applied to solve the input forces sequence of vibration source. Secondly, the in-site deep-hole excitation measurement is done to acquire the soil vibration transfer function series. Thirdly, a finite element model is used to get the tunnel structure correction function series. Then, the three parts above are superimposed in frequency domain to obtain the ground vibration response caused by the metro operation. In order to verify the prediction method, a new deep-hole excitation equipment is developed. And the soil transfer function is obtained by the impulse excitation tested inside the 15 meter excitation hole. Further, the proposed method is used to predict metro train-induced environmental vibration. The comparison of the predicted results and the in-situ measured data shows that： the time-domain vibration peaks are both 0.08m/s2 ; the main frequencies of vibration are both around 40Hz to 70Hz ; the magnitudes and change regulations of the 1/3 octave band spectrums and Z vibration levels are also similar. It shows that this prediction method has high accuracy in metro environmental vibration prediction.

关 键 词：地铁列车振动 环境影响 深孔激振 传递函数 预测方法 

分 类 号：U211.3[交通运输工程—道路与铁道工程] X827[环境科学与工程—环境工程]