摘要
为了研究基坑冻结排桩温度场的分布规律,基于传热学理论建立了基坑周围土体的热扩散数学模型,结合边界条件采用MATLAB对其进行了数值求解,获得了其温度场分布。研究结果表明:冻结墙的形成始于中间的冻结孔,而后冻结向两侧冻结孔周围扩展。在冻结孔间土体冻结圈形成的过程中,已冻结墙体周围的温度变化不大。当冻结孔之间的土体冻结完毕,冻土墙初步形成以后,低温开始向冻土墙的两侧蔓延,表现为冻土墙的厚度增加。在基坑的转角处的外侧冻结厚度最小,最大冻结厚度位于冻结墙的中部,而最大负温区出现在冻结墙转角的内侧。
In order to study the distribution rules of temperature field of freezing piles in deep pits, the mathematical model of thermal diffusivity was established based on the heat transfer theory. Combined with the boundary conditions, the distribution of temperature field of deep pits was obtained by using MATLAB. The results show that freezing wall begins with the middle freezing hole, then the freezing process expands to the end holes. On the process of forming freezing-circle among freezing holes, the temperature change of frozen wall is little. After the freezing process among holes is over, low temperature is overspread from frozen wall to sides,and i.t makes frozen wall be thickened. The least frozen thickness lies in the outer of pit comer, and that the most frozen thickness lies in the middle of frozen wall, but the most low temperature occurs the inner of pit comer.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2006年第B11期1510-1512,共3页
Chinese Journal of Geotechnical Engineering
关键词
深基坑
冻结
温度场
数值模拟
deep pit
freezing
temperature field
numerical simulation
