高温季节浇筑混凝土时，受太阳辐射及昼夜温差的影响，混凝土浇筑仓表层温度日变幅较大，形成非线性温度梯度，由此引起的拉应力超过相应龄期混凝土的抗拉强度即产生表面裂缝。基于分布式光纤测温系统具有线测温和实时在线监测的优势，采用分布式光纤对混凝土浇筑仓表层温度进行实时在线监测，确定日变化环境气温和太阳辐射对表层混凝土的影响范围，并建立有限元模型进行温度场及徐变应力场反馈分析。研究表明,对于层厚3 m的浇筑块，表层50 cm区域的混凝土受日变化环境气温和太阳辐射影响较大。

During concrete placement in high temperature seasons, large daily temperature variation on the concrete surface will lead to nonlinear temperature gradient, which causes tensile stress. If the stress exceeds the tensile strength of the concrete in corresponding concrete age, surface cracks will occur. Distributed optical fiber was employed to carry out real-time online monitoring of temperature on the surface layer of the concrete block, and subsequently to determine the area influenced by solar radiation and daily air temperature variation. Moreover, a FEM model was established to perform feedback analysis on temperature field and creep stress field. Results showed that for a concrete block with 3m-thick layer, the area from the surface to the depth of 50cm was largely influenced by daily temperature variation and solar radiation.