在水工结构模型试验中 ,应用光纤传感检测技术检测结构随机裂缝 ,在国际上已经受到高度重视并开始开发应用。四川沙牌碾压混凝土拱坝整体结构模型随机裂缝检测的光纤传感试验表明 ,光纤传感碾压混凝土拱坝整体结构模型随机裂缝获得成功 ,捕捉到了开裂荷载及开裂位置 ,处理涂敷层后的单模光纤对开裂比较敏感 ,光纤的铺设工艺是一个重要技术环节 ,需要进行深入研究 In the hydraulic structure model test, the application of optical fiber sensing technology to detect random cracks in structures has drawn great attention in the world and started to be developed and applied. The overall structure model of Shapai RCC arch dam in Sichuan Province shows that the random crack in the whole structure model of optical fiber sensing RCC arch dam is successful, and the crack load and crack location are captured. After the coating is processed Of the single-mode fiber is more sensitive to cracking, optical fiber laying process is an important technical aspects, the need for further study