| 基于光纤传感技术的土工格栅变形及受力研究 |
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| 引用本文： | 刘倩萁,张孟喜,洪成雨.基于光纤传感技术的土工格栅变形及受力研究[J].水文地质工程地质,2019,0(6):119-125. |
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| 作者姓名： | 刘倩萁 张孟喜 洪成雨 |
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| 作者单位： | 1.上海大学土木工程系，上海200444；2.深圳大学土木与交通工程学院，广东 深圳518060 |
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| 摘 要： | 光纤传感技术具有精度高、灵敏度高的特点，在变形测量方面具有独特优势。但由于缺乏有效的封装保护技术，目前将光纤传感器用于土工合成材料变形监测的应用和研究比较少。文章通过对光纤传感器的封装结构进行设计，较好地解决了光纤传感器与被测物体间的协调变形问题，并延长了光纤传感器的使用寿命。基于此封装结构，通过室内土工格栅加筋边坡模型试验，选取土工格栅的加筋层数及筋材的布设方式作为变量，研究了土工格栅在加筋过程中的变形及受力特性。研究结果表明:在垂直方向上，上层筋材的应变大于下层筋材的应变；在水平方向上，单层变形最大处位于加载点正下方范围内。增加加筋层数，能够使得各层格栅的变形得到分担，同时有效限制坡面的法向位移,尤其是坡面中上部分的法向位移；土工格栅能够显著提高边坡的极限承载力。通过对光纤传感器的研究，表明其能够灵敏监测被测物体的微小变形与受力，实际使用中较为稳定，验证了本文封装结构设计的可行性，弥补了传统测量方法的缺陷。
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| 关 键 词： | 光纤传感技术 土工格栅 加筋土边坡 模型试验 变形测量 封装结构 加筋效果 |
| 收稿时间： | 2019-01-23 |
| 修稿时间： | 2019-04-17 |
A study of deformation and stress of geogrids based on optical fiber sensing technology |
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| LIU Qianqi,ZHANG Mengxi,HONG Chengyu.A study of deformation and stress of geogrids based on optical fiber sensing technology[J].Hydrogeology and Engineering Geology,2019,0(6):119-125. |
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| Authors: | LIU Qianqi ZHANG Mengxi HONG Chengyu |
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| Affiliation: | 1.Department of Civil Engineering，Shanghai University，Shanghai200444，China；2.College of Civil and Transportation on Engineering，Shenzhen University，Shenzhen，Guangdong518060，China |
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| Abstract: | As a new type of sensing technology, the optical fiber sensing technology are characterized by high accuracy and sensitivity, and are suitable for deformation measurement. At present, due to the lack of effective packaging protection methods, the deformation monitoring of geogrids by using optical fiber sensors is seldom conducted. In this paper, the packaging structure of the optical fiber sensor is designed. The package structure may solve the problem of coordinated deformation between the optical fiber sensor and geogrids, and prolong the life of the optical fiber sensor. Based on the reinforced soil slope model test, the number of reinforcement layers and spacing of geogrids are selected as variables to study the deformation and stress characteristics of geogrids. The results show that the deformation of upper reinforcement is larger than that of lower reinforcement along the vertical direction, and the maximum strain of the reinforcement is in the area below the loading point. Newly increased geogrids can effectively share the deformation of initial geogrids and limit the lateral normal displacement of the slope, especially the displacement of the upper and middle parts of the slope. Geogrids can remarkably improve the ultimate bearing capacity of slope. This also study indicates that the optical fiber sensor can sensitively monitor the tiny deformation and stress of geogrids. The packaging structure can effectively remedy the shortcomings of the traditional testing methods. |
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