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针对混凝土坝温度场仿真分析的局限性及采用离散、零星的电阻式温度计实测温度重构温度场时精度较差的问题,探讨了基于分布式光纤测温方法对混凝土坝施工期温度场进行重构。从场理论出发,应用幂级数的处理方法,并结合施工期大体积混凝土热传导理论,将周期项函数、顺河向和垂直向坐标及指数函数进行组合,建立了施工期大坝温度场时空分布模型。结合西南某在建混凝土坝工程的分布式光纤测温资料,回归确定了所建温度场时空分布模型的系数。实例应用表明,基于分布式光纤测温建立的施工期大坝温度场时空分布模型的拟合精度及中短期预测效果较好,真实反映了大坝混凝土的温度状态。
In view of the limitations of the simulation analysis of the temperature field of concrete dams and the poor accuracy when using the discrete and sporadic resistance thermometers to measure the temperature reconstructed temperature field, the paper discusses the temperature field of concrete dams based on distributed optical fiber temperature measurement Structure. Starting from the field theory, applying the method of processing power series, combined with the theory of mass concrete heat transfer during construction, the periodic term function, the vertical coordinate and the exponential function are combined to establish the temperature field of the dam during construction Distribution model. Combined with the distributed optical fiber temperature measurement data of a concrete dam under construction in southwest China, the coefficients of spatial-temporal model of temperature field are established by regression. The example application shows that the fitting accuracy and short-term prediction results of the spatio-temporal distribution model of dam temperature field during the construction period based on distributed optical fiber temperature measurement are good, which truly reflects the temperature status of dam concrete.