车辆振动对山丹明长城遗址的影响分析

Impacting analysis of vehicle vibration on ancient earthen sites of the Great Wall of Ming Dynasty in Shandan County

爆破振动、汽车、火车以及其它各种人类活动所导致的环境振动,对土遗址文物的安全可能会产生严重的影响,振动防护问题乃是文物保护研究中的重要课题之一,而如何科学合理地判定其影响程度并采取必要的防振对策,对于土遗址文物防护非常重要。本文以甘肃山丹县新河驿明长城遗址为例,对各类车辆所产生的振动情况进行了分析测试,获得了高速公路两侧长城土遗址不同部位、不同方向的振动速度和加速度,较为全面地反映了车辆载重、车速、场地条件等因素对振动效应的影响,提出了不同类型土遗址振动安全度安全阈值,为长城土遗址的振动安全防护提供了重要依据。

Ambient vibration caused by blasting vibration,automobile,trains and other human activities may have serious impact on the safety of ancient earthen sites,so the vibration protection is always one of the important issues in the study of heritage conservation. It is significant for the protection of ancient earthen sites to scientifically determine the impact degree and then take necessary vibration control countermeasures. In this paper,taking the Great Wall site of Ming Dynasty in Xinheyi,Shandan County,Gansu province as an example,the impact of vehicle vibration generated by various types of vehicles on the ancient earthen sites was observed and tested. Vibration velocities and accelerations in different parts and different directions of earthen sites of the Great Wall at both sides of the highway were obtained,which could comprehensively reflect the impact of some factors( vehicle load,speed,site conditions,etc.) on vibration effect. Finally,the vibration protective thresholds for different types of earthen sites were proposed. The result could offer valuable reference to the protection of ancient earthen sites of the Great Wall.