在役城市隧道衬砌裂缝扩展规律及其温度效应研究

Research on Crack Propagation Regularity and Its Temperature Effect in Lining of Urban Tunnel on Service

为了获得在役隧道衬砌裂缝扩展量随时间及温度的变化关系,针对重庆市某在役隧道的长期监测数据进行了分析研究,得到了裂缝扩展速率随温度的变化关系以及同一温度下裂缝宽度随时间的发展关系,并将不同温度下的量测数据转换到同一温度条件下,结合时间序列建模方法建立了考虑温度影响的隧道衬砌裂纹扩展量预测时模型;同时,为了增加模型结果的可信度,分别对模型的短期预测误差和长期预测误差进行了分析,结果表明:模型在短期预测中具有较高的精度,而长期预测误差也会随着预测步数的增加而趋于常数。

In order to obtain the relation of crack propagation in service tunnel lining with the time and temperature, the monitoring data of a certain tunnel in Chongqing was studied. The relation between crack growth rate and temperature and the relation between crack width and service time at same temperature were obtained. With the measured data collected at different temperatures conversed to that at the same temperature, the prediction model of tunnel lining crack propagation with time series with consideration of temperature affection was established by using modeling method of time series. At the same time, in order to understand the reliability of the model, the short-term and long-term prediction errors were analyzed respectively. The result shows that the model has higher accuracy in short-term prediction and long-term prediction accuracy of the model tends to be a constant with prediction progressing.