地下开挖模型试验的光纤监测  

Fiber Optic Monitoring of an Underground Excavation Model Text

作　　者：朱鸿鹄[1,2] 朱维申[3] 殷建华[1] 张乾兵[3] 裴华富[1] 靳伟[4] 

机构地区：[1]香港理工大学土木及结构工程学系 [2]南京大学地球科学与工程学院,江苏南京210093 [3]山东大学岩土与结构工程研究中心,山东济南250061 [4]香港理工大学电机工程学系

出　　处：《中国矿业大学学报》2010年第6期826-830,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(90510019);香港理工大学资助项目(G-YE14;G-YE54;1-BB7U)

摘　　要：为了克服传统监测技术难以测量小型地质力学模型内部位移场的缺点,开发了基于光纤光栅(FBG)技术的新型棒式光纤位移传感器.将成串的光纤光栅对称黏贴于胶棒上,进行了一系列室内标定试验.在模拟双江口水电站地下开挖工程的三维模型中,采用先灌浆后埋入的方法在预制孔中成功安装了3根光纤位移传感器.标定试验和模型试验结果表明,该位移传感器可根据光纤光栅的应变读数准确测算出位移沿棒长的分布;在地下洞群开挖的整个过程中,主厂房和尾水调压室周边的水平位移保持在较小范围内,开挖活动对整体稳定性未造成不利影响.An innovative bar-type fiber optic displacement sensor based on fiber Bragg grating（FBG）technique was developed to overcome difficulties of conventional methods used to monitor internal displacement fields within a small-scale geomechanical model.An FBG array sensors was attached to a plastic bar and laboratory calibration of the apparatus was performed.Three sensors were installed into a three-dimensional model simulating the underground excavation of the Shuangjiangkou hydro-power station.The sensors were installed with apre-grout method.Calibration and model tests show that the displacement sensor accurately measures displacement profiles along the bar length.The strain data from the FBG sensors provides the information used to derive the displacement profile.Horizontal displacements during excavations near the main power house and the surge chamber are within a small range and the excavation activities are demonstrated not to affect the overall stability of the structure.

关 键 词：地下开挖 光纤位移传感器 光纤光栅 地质力学模型试验 

分 类 号：TU458[建筑科学—岩土工程]