【摘要】 以热传导理论为基础建立了冻土区单桩地温场的热分析模型,然后以青藏高原清水河某地段夏季施工为条件,考虑实际气温和地温的初始条件,用有限元方法计算了混凝土入模温度从5℃提高到12℃时桩周地温场的变化,分析提高混凝土入模温度对桩的自然回冻时间及施工进度可能造成的影响,所得结论可为冻土区钻孔灌注桩施工进度安排提供参考。更多还原

【Abstract】 Based on the theory of heat conduction, this paper establishes the heat analysis model of the temperature field of ground for a single pile in permafrost. For a cast-in-place pile that is built in the Qingshuihe permafrost area of the Qinghai-Tibet plateau in summer, when the cast-in-place temperature of concrete is increased from 5℃ to 12℃,the variations of temperature field of ground are calculated by using the finite element method with consideration of actual boundary conditions and initial conditions of temperature. Influence of the casting temperature of a concrete pile on the temperature field of ground and construction plan is analyzed. The conclusions drawn out from this paper can provide reference for working out construction plans of cast-in-place pile in permafrost, zones.更多还原