CAJ | 학술논문

由于力学理论和有限元仿真应用于道路结构的分析受材料参数与边界条件等因素影响较大，要获得其准确、真实的受力状态，需借助原位监测技术。然而，日益得到推广应用的高性能光纤光栅敏感元件因其传统的封装方式，无法在模量上匹配相对离散的道路结构测试。为此，本文以沥青路面结构为研究对象，提出了一种以纯沥青为光纤光栅外包层、以小粒径沥青混合料为封装层的柔性基体材料光纤光栅封装技术，建立了其变形作用机理的力学模型，从理论角度分析其应变传递机理，给出了相应的误差修正公式，并通过模型试验方式检验该传感器的感知性能及误差修正公式的适用性。研究结果表明：该种柔性原材料封装光纤传感器可用于沥青混合料的监测，且借助应变传递误差修正公式能较好地消除部分因素的影响，间接地保证了沥青路面结构真实变形的高精度还原，为路面结构监测技术的发展起到了积极的推进作用。
유우역학이론화유한원방진응용우도로결구적분석수재료삼수여변계조건등인소영향교대，요획득기준학、진실적수력상태，수차조원위감측기술。연이，일익득도추엄응용적고성능광섬광책민감원건인기전통적봉장방식，무법재모량상필배상대리산적도로결구측시。위차，본문이력청로면결구위연구대상，제출료일충이순력청위광섬광책외포층、이소립경력청혼합료위봉장층적유성기체재료광섬광책봉장기술，건립료기변형작용궤리적역학모형，종이론각도분석기응변전체궤리，급출료상응적오차수정공식，병통과모형시험방식검험해전감기적감지성능급오차수정공식적괄용성。연구결과표명：해충유성원재료봉장광섬전감기가용우력청혼합료적감측，차차조응변전체오차수정공식능교호지소제부분인소적영향，간접지보증료력청로면결구진실변형적고정도환원，위로면결구감측기술적발전기도료적겁적추진작용。
Since the application of mechanics theory and finite element simulation in pavement is confined for the material parameters and boundary conditions, in-situ monitoring technology is thus adopted to obtain the accurate and practical mechanical state. However,the widely used fiber Bragg grating( FBG) with high performance limited to the traditional packaging techniques cannot match the Young’s modulus of discrete pavement structure,which influ-ences the monitoring. Therefore,a flexible raw-material packaged sensor is developed to monitor the strain of asphalt pavement,which regards pure asphalt as the cladding of FBG and small-size asphalt mixture as the protective layer. Corresponding mechanical model is established to explain the deformation-effect mechanism and the strain transfer mechanism is analyzed in theory to offer related error modification formula. Laboratory experiment is carried out to investigate the behavior of the developed FBG sensor and the feasibility of the proposed strain transfer error modifi-cation formula. Research results illustrate that the flexible raw-material packaged FBG sensor is available for the strain detection of asphalt concrete,and the proposed error modification formula can greatly eliminate a part of influ-ence,which indirectly guarantees the high precision revivification of practical strain of asphalt pavements and plays an active role in promoting the development of asphalt pavement health monitoring.