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锚头的受力情况对整个锚杆的安全性有着重要影响。为了实时反映锚头的受力状态,将2只光纤Bragg光栅沿45°粘贴在轮辐式结构锚头的两根对称辐条中点处表面上,形成轮辐式测力传感结构,辐条在压力作用下产生剪切变形,引起辐条表面的光纤Bragg光栅中心波长移位。通过对光纤Bragg光栅中心波长移位的测量,实现在锚头处锚杆轴向拉力的在线监测。锚头压力实验表明:光栅1的测力灵敏度为108.8pm/kN,线性度为0.042%FS;光栅2的测力灵敏度为115pm/kN,线性度为0.023%FS。
The force of the anchor head has an important influence on the safety of the whole anchor rod. In order to reflect the force state of the anchor head in real time, two fiber Bragg gratings are attached to the surface of the middle point of two symmetrical spokes of the spoke anchor head along 45 ° to form a spoke-type force-sensing structure. Under the shear deformation, causing the fiber surface of the fiber Bragg grating wavelength shift center. Through the measurement of the center wavelength shift of the fiber Bragg grating, the on-line monitoring of the axial tension of the anchor rod at the anchor head is realized. Anchor pressure experiments show that: Grating 1 has a sensitivity of 108.8pm / kN and a linearity of 0.042% FS; Grating 2 has a sensitivity of 115pm / kN and a linearity of 0.023% FS.