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考虑相变和热量生成 ,导出了瞬态温度场问题的热量平衡控制微分方程 ,并应用伽辽金法推导出了有限元计算公式。通过对青藏铁路正在修建涵洞的现浇混凝土基础水化热的影响分析 ,可以看出 ,现浇混凝土水化热在施工后半年内对涵洞周围冻土的热状况影响较大 ,施工后 2年时仍有影响。为了减小这种影响 ,还计算分析了涵洞现浇混凝土基础下按 2种方式铺设保温材料的冻土热状况。通过分析比较可以看出 ,在涵洞现浇混凝土基础下铺设保温材料可以大大减少现浇混凝土水化热对冻土热状况的影响
Considering the phase transition and heat generation, the heat balance control differential equation of transient temperature field is deduced and the finite element formula is deduced by Galerkin method. Through the analysis of the influence of hydration heat on the cast-in-place concrete foundation of culvert under construction in Qinghai-Tibet Railway, it can be seen that the hydration heat of cast-in-place concrete greatly affects the thermal condition of permafrost surrounding culvert within six months after construction, Still affecting. In order to reduce this kind of influence, the thermal state of permafrost also was calculated and analyzed based on two ways of pouring insulation materials on the foundation of culvert cast-in-place concrete. Through analysis and comparison, it can be seen that laying insulation materials under the foundation of culvert cast-in-place concrete can greatly reduce the influence of the heat of pouring concrete hydration on the thermal condition of frozen soil