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1 概述碾压混凝土重力坝以其坝体分缝少、施工进度快越来越受到坝工界的重视,但是,碾压混凝土坝和常态混凝土大坝一样,必须采取严格的温控措施,以确保坝体内部的最高温度和断面温度变化梯度不超过设计值,以避免由于温度变化和混凝土体积收缩而在坝面和坝体内部出现裂缝,影响大坝的防渗性能和耐久性,因此必须对大坝内的温度场及其发展变化有很好的了解,否则就要降低施工进度。新疆石门子水库是国内首次利用普通光缆测量碾压混凝土大坝内的温度,具有较高的科学研究和技术推广价值。2 光纤温度测量系统的方法、原理光纤温度测量系统是基于光纤本身的散射现象来进行温度测量的。当某一波长的脉冲光导入光纤后,从光纤返回三种随时间变化的散射光;Rayleign、Raman和Brillouin。其中,Rayleign散射光与入射光的频率相同,是由于光纤材料折射率
1 Overview Roller-compacted concrete gravity dam with less dam seams, construction progress more and more by the dam industry attention, but RCC dam and normal concrete dam, we must take strict temperature control measures to To ensure that the maximum temperature inside the dam and the gradient of the section temperature does not exceed the design value, in order to avoid cracks and cracks in the dam surface and dam body due to temperature changes and concrete volume shrinkage, which affects the seepage resistance and durability of the dam. Therefore, The temperature field in the dam and its development and change have a good understanding, otherwise it is necessary to reduce the construction schedule. Xinjiang Shimenzi Reservoir is the first time in China using ordinary fiber optic cable to measure the temperature inside the RCC dam and has high value for scientific research and technology popularization. 2 optical fiber temperature measurement system methods, principles Optical fiber temperature measurement system is based on the scattering phenomenon of optical fiber to carry out temperature measurement. When a certain wavelength of pulsed light is introduced into the fiber, three scattered light is returned from the fiber over time; Rayleign, Raman and Brillouin. Among them, Rayleign scattered light and incident light the same frequency, is due to the refractive index of optical fiber materials