研究目的
To monitor the internal sliding damage in civil engineering using non-destructive detection methods, specifically focusing on rock slide and steel-concrete interface slip monitoring.
研究成果
The distributed optical fiber slide sensing and interface slip sensing technology are effective for monitoring rock slide and steel-concrete interface slip. The system is sensitive, with loss values ranging from 30 to 50dB, and dynamic ranges of 3 to 3.5mm for rock slide monitoring and 1.6mm for interface slip monitoring. The bonding process using epoxy resin, curing agent, and aluminum powder is effective for detecting the sliding process.
研究不足
The study is limited to laboratory conditions and may not fully replicate real-world scenarios. The sensitivity and dynamic range of the optical fiber sensing system are constrained by the materials and methods used.
1：Experimental Design and Method Selection:
The large triaxial shear test of geotechnical engineering was used to simulate the complex deformation state of the actual sliding structure. The experiment involved optical fiber monitoring rock slide model test and optical fiber monitoring of steel concrete interface slip model test.
2：Sample Selection and Data Sources:
Cylindrical concrete structure specimens with design strength C40 were used. Optical fibers of different diameters (900μm, 600μm, and 250μm) were embedded in the specimens.
3：List of Experimental Equipment and Materials:
SZ-40 type large triaxial compressor, AI9201A type optical power meter, PVC tubes, organic glass sheets, epoxy resin, curing agent, and aluminum oxide powder.
4：Experimental Procedures and Operational Workflow:
The specimens were prepared with optical fibers arranged in different layouts. After pouring concrete, the specimens were subjected to triaxial compression tests. The loss of optical fiber power was observed and recorded during the test.
5：Data Analysis Methods:
The relationship between the sliding distance and the loss of light was analyzed. A semi-empirical formula for calculating the attenuation value was presented based on the observed data.
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