The Experiment Study Of Full Grouting Bolt By Optical Fiber Grating Sensing

The rock bolting is the most widely supporting method in the underground engineering. But the test of the stress and the strain is very difficult because of the complication of the anchor's stress state. The paper studied the application of the Fiber Bragg Grating sensors for the rock bolting support based on the stress state analyses of the anchor and the transmission peculiarity of the FBG,. The paper's success will offer a new test way.First, based on the outcome of other savants, it analyzed the deformation of the full grouting bolt under tensile loading, acquired that the axial tension diminished with the exponent equation in the anchorage depth, and the distribution extent of the shear stress will diminish with the parameters' increase of the cohering medium, etc. It prepared for the basic theory of the experiment.The Fiber Bragg Grating sensor is one of the sensor that developed rapidly recently years. Based on the principle of light travel in FBG, the deformation with the stress of axis properties have been analyzed, then the rock observation system of fiber Bragg grating sensors have been given, and analyzed the theorem of the system. It pointed out that the system is fit for not only the unity anchor but also the anchor group.Base on the theory analyses; the paper tested the deformation course in the pull experiment of the full grouting bolt with five FBG Then, the experiment results have been analyzed by numerical analyses; it is showed that the credibility is well to the whole experiments for all that there is some deflection. The experiment results show that it is workable use the Fiber Bragg Grating sensor test the deformation of the anchor, the experimental results agree well with that from theoretical analyses cohering medium.