混凝土面板堆石坝施工期面板温度应力仿真分析

结合在建的公伯峡水电站混凝土面板堆石坝,考虑影响面板温度场及温度应力的各项因素,实时模拟面板的施工过程,对施工期面板的温度场和温度应力进行了全过程仿真分析。结果表明,在面板混凝土浇筑初期,面板各个层面(表面、中心)的最高温升与面板厚度有关,且面板中心的最高温升大于面板表面的最高温升。此后,面板各个层面的结点温度均迅速下降,表面降温比中心快。最大压应力发生在最高温升时的面板底部中心层面上,最大拉应力发生在最高温升后出现最大温降时的面板中部表面上。

Simulation analysis on slab's thermal stress of CFRD in construction period

Combining with the building Gongboxia CFRD and considering each factor affecting the temperature field and thermal stress of slabs,the construction process of slabs is,in real time,simulated.Also,the simulation analysis is made for the complete process of temperature field and temperature stress of slabs in construction period.The results show that at the beginning of concrete placement,the maximum temperature rises for different layers (surface and center) of slabs are related to the thickness of slabs,and the maximum temperature rise of slab center is larger than that of slab surface.The maximum compressive stress occurs on the center layer of slab bottom in the time of the maximum temperature rise,the maximum tensile stress occurs on the surface of slab center when the maximum temperature drop happens,after the maximum temperature rise occurs.