岩体裂隙区全长黏结锚杆应变测试方法

受到裂隙岩体非连续变形以及全长黏结锚杆与黏结剂间复杂剪切作用的影响，裂隙区域的锚杆应变量值一直难以准确测量.通过3D打印制备全长黏结锚杆，并在杆体内、外侧分别粘贴应变片，利用单轴压缩试验获得了裂隙开裂过程全长黏结锚杆拉应变的演化规律.研究发现，外侧的应变片受黏结剂剪切变形影响较大，且当黏结剂塑性变形能力较强时，其测试结果易失真.而内部的应变片能准确获得杆体应变的全过程曲线.最后利用FLAC软件模拟裂隙处锚杆失效过程，验证了应变片不同粘贴方式对测试结果的影响，也进一步证明了杆体内粘贴应变片测试方法的可行性.

Strain Measurement Method of Fully-Grouted Rock Bolt in Rock Mass Fractured Zone

Due to the effects of discontinuous deformation in fractured rock masses and complex shearing between the rock bolt and the grout， the strain of rock bolt in fractured zone can hardly be measured accurately. A fully-grouted rock bolt was prepared by using 3D printing， and strain gauges were installed inside and outside the bolt respectively. The evolution law of tensile strain in the fully-grouted rock bolt during the fracture propagation process was obtained by uniaxial compression test. It was found that the outer strain gauges were greatly affected by the shear deformation of the grout， and the measurement results are easy to be distorted when the plastic deformation capacity of the grout is high. However， the internal strain gauges could accurately obtain the complete strain of bolt. Finally， the failure process of rock bolt in fractured zone was numerically simulated by FLAC software， the influence of strain gauge location on the measurement results was verified， which further proved the reliability of measurement by strain gauges inside the rock bolt.