基于DOFS的水位变化下土质边坡模型稳定性试验研究

作为实现分布式监测技术(DOFS)的重要手段,光纤感测技术近年来得到了迅速的发展。这一技术在地质灾害和岩土工程监测领域有着巨大的应用潜力。本文基于布里渊光时域分析(BOTDA)和布喇格光栅(FBG)两种感测技术,设计了土质边坡稳定性分布式监测室内模型。通过模型试验,重点研究了水位变化作用下土质边坡内部应力分布以及边坡的破坏过程,根据FBG与BOTDA的应变数据,对土质边坡稳定性进行了评价,验证了BOTDA和FBG分布式光纤感测技术应用于土质边坡变形监测的可行性。研究成果对于光纤分布式感测技术的应用研发和在多场作用下的土质边坡稳定性分析具有重要的意义。

MODEL TEST OF SOIL SLOPE STABILITY WITH DISTRIBUTED OPTICAL FIBER SENSING TECHNOLOGY

As an important means to realize the distributed monitoring technology, optical fiber sensing technology has been rapidly developed in recent years. This technology has a great potential of applications in the field of geological and geotechnical engineering monitoring. In this paper, a distributed monitoring model of soil slope stability is designed, which is based on the following two kinds of sensing technology: Brillouin Optical Time Domain Analysis(BOTDA) and Fiber Bragg Grating(FBG).Through the model test, the strain distribution and failure process of the slope by water level are studied. According to the monitoring data of FBG and BOTDA,the stability of soil slope is evaluated. The feasibility of BOTDA and FBG distributed optical fiber sensing techniques is verified for slope deformation monitoring. The research results have an important significance for application of the distributed fiber sensing technology and analysis of soil slope stability in multiple fields.