【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有限元模型,然后根据青藏高原清水河某地段实际气温和地温的初始条件计算了寒季施工条件下,混凝土入模温度分别为5℃及12℃时桩周地温场的变化,分析了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理论参考依据.更多还原

【Abstract】 Based on the theory of heat conduction,we establish the finite element model of analyzing ground temperature field for single pile in permafrost. For a castinplace pile that was built in Qinsuihe area of QinghaiTibet plateau in winter,when casting temperature of concrete is set with 5 ℃ and 12 ℃ respectively,the variations of ground temperature field were calculated with consideration of actual boundary conditions,and initial conditions of temperature. In the procedure,influences of casting temperature of concrete pile on ground temperature field and construction plan are analyzed. The conclusions drawn from this paper can provide reference for constituting construction plan of castinplace pile in the permafrost.更多还原