(1. College of Civil Engineering and Mechanics，Lanzhou University，Lanzhou，Gansu 730000，China；2. Key Laboratory of Mechanics on Disaster and Environment in Western China，Ministry of Education，Lanzhou University，Lanzhou，Gansu 730000，China)
Abstract：In order to investigate the bonding performance between the distributed optical fiber sensor and rock mass of Grotto Temple，a series of surface bonding tests were carried out using two different types of Grotto Temple sandstone and three kinds of adhesives with different components. The interface bonding strength，deformation characteristics and failure mode were analyzed，and then the influence mechanism of adhesive and rock type on the bonding strength was discussed. The results indicate that：(1) for all different adhesives，the bonding strength between sandstone with compact structure and distributed optical fiber sensor was higher than loose sandstone?s. For the same sandstone samples，the bonding performance of cyanoacrylate adhesive is better than polyurethane and epoxy resin. (2) It was found that the expression of the load-displacement curves of distributed optical fiber sensor and sandstone bonding tests is very similar to the expression of the axial force of the bolt based on the nonlinear fitting. (3) The failure modes of the interfaces of distributed optical fiber sensor and sandstone are divided into fiber sensor sheath broken，rock surface rupture，fiber sensor and adhesive layer separation and fiber sensor and fixture separation. (4) The penetration range and bonding shape of adhesive are related to adhesive viscosity，curing time and porosity of rock sample. Bonding strength has a significant effect on the failure modes of the interfaces of distributed optical fiber sensor and sandstone. The research results can provide a technical support for the application of distributed optical fiber sensor in the field of rock mass stability monitoring of Grotto Temple.
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2023, Vol. 42 
