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Research and application of strain monitoring technology for surrounding rock of large underground cavern

In the process of underground cavern excavation, the relaxation deformation and strain of surrounding rock are the focus of engineers and technicians[1].This paper introduces a continuous strain monitoring device and technology modified by grating optical fiber displacement sensor. Using this technology, the continuous displacement measurement values along the full hole depth of the instrument buried measuring hole can be obtained, and then the continuous strain value can be calculated by using the instrument installation and embedding gauge distance. The application of this technology in practical engineering has obtained good monitoring results, which provides a scientific and reliable basis for the control of excavation strength and the determination of support scheme. It can provide a useful reference for similar engineering cavern surrounding rock monitoring.