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研究了岩石变形过程光纤光栅传感检测的关键技术及理论,提出了单轴压缩实验中的表面粘贴法。建立了表面粘贴法的应变传递模型,推导并求得了应变传递系数,以此为理论基础进行了MTS的对比实验,测试方向分别沿试件的轴向及环向。结果表明,经应变传递系数换算后,光纤光栅轴向应变与MTS测试结果相一致,相对误差率仅为2.8%;环向测试优于MTS的环向应变计,两种方法的测试结果均优于同位置粘贴的应变片。验证了应变传递模型的正确性,并表明光纤光栅表面粘贴法可以用于岩石的单轴压缩实验中,且与传统测试方法相比具有无可比拟的优越性。这对于提高岩石变形检测水平,实现工程实践中长期有效的在线监测具有重要意义。
The key technologies and theories of fiber grating sensing sensing in rock deformation process are researched, and surface sticking method in uniaxial compression experiment is proposed. The strain transfer model of surface paste method was established, and the strain transfer coefficient was deduced and obtained. Based on this, the MTS comparison experiment was carried out with the test directions along the axial direction and the circumferential direction respectively. The results show that after the strain transfer coefficient is converted, the axial strain of the fiber grating is consistent with the MTS test results, the relative error rate is only 2.8%. The ring test is better than the MTS ring strain gauge, and the results of the two methods are excellent Strain gauge attached at the same position. The correctness of the strain transfer model was verified, and the results show that the FBG surface paste method can be used in the uniaxial compression experiment of rock, and has unparalleled superiority compared with the traditional test methods. This is of great significance to improve the detection level of rock deformation and achieve long-term effective on-line monitoring in engineering practice.