基于文物振动安全的地铁与文物空间关系研究
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摘要
地铁规划阶段文物遗址保护对地铁线路走向和埋深有重要影响,因此需要提出预测地铁导致文物遗址振动的方法,并据此确定免受地铁振动影响的地铁与文物空间关系。为此,本研究以某历史名城拟建地铁为工程背景,建立有限元分析模型,通过对西安地铁二号线与成都地铁二号线现场振动实测,调整土体的力学参数,计算不同工况下地表及地下遗址振动响应,根据国家现行标准对文物遗址振动安全做出评价,为地铁线路走向和埋深设计提供依据。研究表明,地表振动随隧道埋深、距文物遗址的水平距离的增加而减小,随车速的增加而增大。当车速为80km/h、隧道顶埋深15m时,隧道正上方地表处振动可满足全国重点文物保护单位振动控制标准。研究成果可为基于文物振动安全的地铁与文物空间关系分布提供参考。
The necessity to protect cultural heritage sites has a big impact on the planning of metro lines,such as routes and depths of tunnels. A prediction model is needed to see how traffic-induced vibration can affect relics and what can be done to prevent damage. In this article,it is assumed that a subway line is proposed for a historical city,and then a model based on real vibration data collected from Xi'an and Chengdu subway systems is established.The mechanical parameters of the soil were considered and a vibration response model of relics,both above and below ground,was established under various conditions. The results were evaluated based on national standards.These studies provided information in regard to the design of subway routes and tunnel depths. In summary,these studies showed that ground vibration decreases as tunnel depth increases and it increases as the train speed increases. When the train speed is 80 km / h,the tunnel( top) depth should be 15 m to meet the vibration control standards of the National Protection Unit. These results provide a reference for consideration of traffic induced vibration and relics security.
引文
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