直线形冻土墙动态温度场的试验研究

Experimental study on dynamic temperature field of linear frozen wall

在研究直线形冻土墙用于深基坑支护时其温度场数学模型的基础上,考虑工程因素,根据相似理论,对冻土墙温度场进行了模拟试验研究。结果表明:在积极冻结期冻土墙厚度与温度分布的无因次方程近似为直线方程、与时间的无因次回归方程为二次多项式方程;提出了冻土墙平均温度、厚度、积极冻结时间的推算方法;用一定厚度的泡沫塑料板对冻土墙保温是方便而可行的。

On the base of studying on the mathematic model about the temperature field of the frozen wall used for protecting the deep foundation ditch and accounting for engineering factors, a series of model tests are completed for researching the dynamic temperature field of the frozen wall according to the simulation theory. The results indicate the dimensionless equation between the thickness of the frozen wall and the temperature distribution approximates linear,the dimensionless equation between the thickness of the frozen wall and the frozen time is quadratic polynomial. The calculating methods about the average temperature and the thickness and the frozen time of the frozen wall are put forward based on the experimental results. It is convenient and available to keep the temperature of the frozen soil wall using the foam plate.