关键词: 光纤光栅测试技术, 元器件研发, 顺层边坡, 支挡结构, 降雨模型试验

Abstract: In the rainfall model test of the bedding slope, since it is challenging to install the monitoring components and to measure stress of retaining structures, a fiber grating technology is adopted to solve the above problems. Based on the deductions of different measuring principles of fiber grating sensors, the corresponding experimental components have been developed by combining with the fiber Bragg grating (FBG). Two kinds of the bedding rock slope with a dip angle of 40 ° of rock layers are constructed to perform model tests under rainfall conditions with and without retaining. Physical and mechanical characteristics including slope displacement, frame-anchor internal forces and moment of anti-slide pile are monitored. The results show that components of fiber grating technology maintains well in difficult environments. Interlayer dislocation phenomena appear in the bedding rock slope with high dip angle without retaining during rainfall. When the retaining structure is used in the model slope, the displacement model changes from a steep variant to a slow variant, and the interlayer dislocation phenomena are also restrained. The locations of retaining structure where the internal force grow fast transfer from the rear retraining structure to the front and deep portion of the slope. The internal force increases slowly in the anchor at the top of the slope, while increases rapidly at the lower part of the anchor and the pile. The internal force reaches a steady state until about 2 hours after rainfall. It can be used to determine the key monitoring location and time for the bedding slope under rainfall conditions. This study provides new insights and methods for the bedding slope monitoring and evaluation of the operating characteristics under rainfall conditions.

Key words: fiber grating monitoring technologies, components development, bedding rock slope；retaining structures, rainfall model test