基于分布式光纤的特高混凝土拱坝导热系数反演分析

An Inverse Analysis of High Coefficient of Thermal Conductivity Based on the Distributed Optical Fiber

反演分析是主要利用监测资料的正分析成果,应用数学方法反求大坝及其基础的热力学参数,可以评价计算模型和结果的精度,从而提高计算成果的准确性。基于分布式光纤的测温优势,结合西南某施工期特高拱坝河床坝段,通过在其特殊浇筑仓距表层下60cm内不同深度处埋设分布式光纤测温,并对其测温结果分别取平均值,从而反求大坝混凝土导热系数。计算结果表明,比大坝设计初期拟定值略高,符合实际情况,其结果更加真实可靠。

The Inversion analysis is the main use of monitoring data analysis results, application of mathematical methods reverse thermodynamic parameters of dam and its foundation, can evaluate the computation model and the accuracy of the results, so as to improve the accuracy of calculation results. In this paper, based on the distributed optical fiber temperature measurement advantages, combined with a high arch dam riverbed dam section during construction period, southwest through its special casting warehouse within 60 cm from the surface under different embedding distributed optical fiber temperature measuring depth, average respectively, and the temperature measurement results to reverse the coefficient of thermal conductivity of concrete dam. The results show that the initial proposed design value slightly higher than the dam, conform to the actual situation, the result is more reliable.