由道路交通预测地铁振动衰减规律的实测研究

对地铁引发的环境振动进行有效预测是沿线环境评价及线路规划的重要依据,但不同场地的地铁振动衰减规律差异很大。基于此,笔者提出了采用同一场地内地面道路交通振动实测对地铁振动衰减规律进行预测的方法。首先,选取地面道路和地铁线路伴行的测试场地,开展了地面道路车辆和地铁引发的地表振动响应实测;基于实测数据的统计分析,研究了车辆分别行经路面缺陷及平坦路面时引发的场地振动衰减规律,探讨了采用道路交通振动预测相应地铁振动衰减规律的有效性和适用性。研究结果表明,在距地铁线路约一倍埋深后,采用车辆行经路面缺陷引发振动的实测结果可较准确地预测地铁振动衰减规律,有效值和振级的预测误差均在15%以内。

Measurement and Research on Metro Vibration Attenuation Law Predicted by Road Traffic

Prediction and evaluation of vibration induced by metro are becoming more and more important and helpful to project planning.It is difficult to predict each other between two metro lines because of different field conditions.Due to this,a new method,which predicts the attenuation law of vibration induced by metro through analyzing that induced by road vehicle at the same site,is proposed.First of all,in-situ measurements of ground vibration were carried out at a site where there are both underground metro line and overground road.Ground vibration attenuation laws were acquired when the vehicle goes through road surface defects and flat pavement.The validity and applicability of the vibration attenuation law of metro subway predicted by road traffic were discussed.Results indicate that,at distance equals the buried depth of metro,it is feasible to predict the attenuation law of vibration induced by metro,and the max prediction error of effective value and vibration level are within 15％.