基于BOTDR的光纤应变与顶板沉降变形关系的模型构建与试验研究

发布时间：2018-11-16 17:47

【摘要】：可以实现分布式、长距离、实时监测的BOTDR监测技术已在土木工程领域得到了较为广泛的应用,但在岩土工程领域的应用研究起步较晚,相关技术还有待于进一步完善。以布里渊BOTDR的巷道/隧道应变监测技术为基础,研究了沿巷道轴向进行一维布设的光纤应变测量值与隧道顶板沉降变形之间的关系。首先,根据巷道/隧道顶板的变形规律,建立了光纤沿巷道/隧道轴向发生的应变与巷道/隧道顶板的沉降变形之间的数学模型,即圆弧模型、抛物线模型和三角形模型。其次,对巷道/隧道顶板的沉降变形与光纤应变之间的关系进行了试验研究。对比分析表明,理论计算值与试验值具有很好的一致性。利用圆弧模型、抛物线模型和三角形模型等3个计算模型,可以将光纤应变与顶板沉降联系起来,这对于BOTDR技术的应用与推广具有重要的理论意义和工程实用价值。
[Abstract]:BOTDR monitoring technology, which can realize distributed, long distance and real time monitoring, has been widely used in the field of civil engineering, but the application research in geotechnical engineering has started late, and the related technologies need to be further improved. Based on the Brillouin BOTDR technique of tunnel / tunnel strain monitoring, the relationship between the one-dimensional fiber strain measurement along the tunnel axial direction and the settlement of tunnel roof is studied. Firstly, according to the deformation law of roadway / tunnel roof, the mathematical models of the strain occurring along the roadway / tunnel axial direction and the settlement deformation of the roadway / tunnel roof are established, which are arc model, parabola model and triangular model. Secondly, the relationship between the settlement of roadway / tunnel roof and fiber strain is studied experimentally. The comparison and analysis show that the calculated value is in good agreement with the experimental value. Using three calculation models, arc model, parabola model and triangle model, the strain of optical fiber can be connected with the settlement of roof, which is of great theoretical significance and practical value for the application and popularization of BOTDR technology.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;
【基金】：中央在京高校重大成果转化项目(No.ZDZH20141141301) 国家自然科学基金委员会与神华集团有限责任公司联合资助重点项目(No.U13611139,No.U1261212)~~
【分类号】：TD327;U456.3

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