随着地质力学模型试验在研究地下变形破坏产生的机理方面发挥越来越重要的作用，准确测量模型内部应力应变的需求越来越强烈。本项目拟运用光纤Bragg光栅传感技术解决地质力学模型内部应变量测的问题。在本研究领域中首次将去除涂覆层的裸光纤光栅埋入相似材料试件内部制成传感器，研究光纤在相似模拟材料中有效提取应力应变的布设工艺。研究去除涂覆层的裸光纤光栅在低弹性模量相似材料中的应变传递机理，以及提高光纤与相似材料耦合性的方法。在理论分析和数值模拟的基础上，运用非接触式光纤位移传感技术通过实验验证的方法，对理论分析的准确性和可靠性进行验证。研究基于相似模拟材料的光纤光栅应变传感器，结合地质力学模型试验研究该传感器在模型试验中的应用方式。该项目的研究为解决地质力学模型试验的应力应变测量问题提供重要的理论和技术支撑。

How to measure the internal strain of geomechanics model has become a more and more important question, as geomechanics model test has been playing an increasingly important role in researching the principle of deformation and destruction. This project presents a new technology to measure the internal strain based on Fiber Bragg Grating. A non-coating FBG was buried in the similar material specimen for the first time in this field. Layout method on how to get the strain in the similar material was presented in the project. The principle of strain transfer of non-coating FBG in low elasticity modulus and how to increase the coupling between fiber and similar material was tested. Based on thesis analysis and numeric simulation, also with non-contact fiber displacement technology, we validate the accuracy and dependency of the thesis. Sensors based on FBG and similar material were presented after testing in geomechanics model test. This project is an important thesis and technology support to measure the internal strain in the geomechanics model.