一种用于滑坡监测的复合光纤装置

发布时间：2018-06-02 08:19

本文选题：光时域反射 + 滑坡　；参考：《光子学报》2017年08期

【摘要】：针对滑坡体深部位移这一重要指标,基于光时域反射技术,设计了一种蝴蝶结形式的复合光纤装置用于监测深部剪切位移.该传感装置由方形聚氯乙烯树脂管、毛细钢管、光纤、砂浆组合而成.首先在40mm×40mm×500mm(厚2.0mm)的聚氯乙烯树脂方管四周开挖导槽,将Φ1×500mm毛细钢管放置在导槽中.然后用光纤穿入毛细钢管,光纤一端固定,另一端绕制成蝴蝶结形式.最后在聚氯乙烯树脂管外围浇筑Φ110mm的砂浆,制作成圆柱式复合光纤装置.室内边坡模型剪切测试台测试结果表明:该装置对深部剪切位移初测准确度为1mm,最大测量范围为40mm.分析表明该复合光纤装置具有灵敏度高、测量范围大、结构简单易于安装等优点,可以用于滑坡以及野外岩土结构工程等进行现场原位监测.
[Abstract]:Aiming at the important index of deep displacement of landslide, a kind of composite optical fiber device based on optical time domain reflectance (OTDR) is designed to monitor deep shear displacement. The sensor is composed of square PVC resin pipe, capillary steel pipe, fiber optic fiber and mortar. Firstly, the guide groove is excavated around the 40mm 脳 40mm 脳 500mm (thick 2.0 mm) PVC square pipe, and the 桅 1 脳 500mm capillary pipe is placed in the guide groove. The fiber is then inserted into the capillary tube, fixed at one end and wound at the other end to form a bow. Finally, the 桅 110mm mortar was poured around the PVC resin pipe and made into a cylindrical composite optical fiber device. The test results of indoor slope model shear test bench show that the accuracy of initial measurement of deep shear displacement is 1 mm, and the maximum measuring range is 40 mm. The analysis shows that the composite optical fiber device has the advantages of high sensitivity, wide measuring range, simple structure and easy installation, and can be used for in-situ monitoring of landslide and field geotechnical engineering.
【作者单位】：重庆大学光电工程学院光电技术及系统教育部重点实验室;重庆大学土木工程学院山地城镇建设与新技术教育部重点实验;
【基金】：国家自然科学基金(Nos.51178488,51478066)资助~~
【分类号】：P642.22;TN253

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