北京故宫东华门城台分布式光纤监测研究  

A Study on Distributed Optical Fiber Monitoring for Platform of Donghua Gate in the Forbidden City,Beijing

作　　者：时以亮 倪斌[2] 施斌[1] 魏广庆 刘卫华 童恒金 

机构地区：[1]南京大学地球科学与工程学院,南京210046 [2]北京故宫博物院,北京100009 [3]苏州南智传感科技有限公司,江苏苏州215123 [4]中兵勘察设计研究院,北京100053

出　　处：《防灾减灾工程学报》2015年第5期637-643,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家科技支撑计划项目(2012BAK10B05)资助

摘　　要：以北京故宫东华门城台墙体为监测对象,基于布里渊散射光时域反射测量技术（BOTDR）对北京东华门城台的北墙体、西墙体和中门洞的变形及渗漏进行了监测。监测结果显示：大部分感测光纤段的应变测量值分布在±100με测量误差范围内,只有城台西墙体部分横向感测光纤段的应变值分布在150~250με之间,表明在西墙体上部局部区域发生了十分微小的鼓胀变形,推断为墙体表面灰泥固化和气温变化引起灰泥热胀冷缩变形所致;城台温度变化没有发现异常区域,表明城台在监测时间段没有渗漏情况发生。因此,判断目前东华门城台整体结构是稳定的。This paper takes the platform of Donghua gate in the Forbidden City as monitoring object.Based on the Brillouin optical time domain reflectometer（BOTDR）,the deformation and leakage of north and west wall of platform as well as the deformation of middle doorway have been monitored.The monitoring results show that the measured strain values of major sensing fiber segments are distributed in the measurement error range of ±100με;Only partial lateral sensing fiber segments of the north wall present tensile strain,but the strain values are in the range from 150μεto 250με,which indicates that a slight drum deformation has occurred in the upper local area of west wall.It can be inferred that the deformation is caused by the curing of the wall surface plaster and the thermal expansion and contraction are caused by temperature changes.The abnormal region of temperature change was not be monitored,which indicated that the leakage of platform didn′t happen.Therefore,we can judge the overall structure of the platform of Donghua gate is stable at present.

关 键 词：古建筑 变形 渗漏 分布式光纤监测 布里渊散射光时域反射测量技术(BOTDR) 

分 类 号：TU413.62[建筑科学—岩土工程]