X形冻结管温度场变化规律研究

Study on the Change Rule of Temperature Field of X-shaped Freezing Tube

为解决现有冻结管单管冻结能力不强致使增加循环冷媒介质用量和施工耗电的问题,可将传统圆形截面设计成异形截面。对X形截面冻结管作一简单介绍,运用有限元软件对X形截面冻结管单管冻结时的温度场变化规律进行研究,同时与圆形、方形、工字形、T形和Y形冻结管单管冻结时的温度场进行对比分析,主要得出结论为:虽然X形等异形冻结管为非圆形截面,但其冻土帷幕温度也是以冻结管为圆心呈同心圆分布,离冻结管越近温度越低;冻结20天时,X形冻结管-10℃圆形冻土帷幕半径发展到200 mm,冻结30天时发展到240 mm,冻结40天时达到约300 mm;与圆形冻结管相比,异形冻结管在保证冻结效果的基础上可大大减少施工耗电量,经济效益显著。

To improve the freezing ability of single pipe of existing freezing pipe for the situation of circulation refrigerant medium dosage and construction power consumption. The traditional circular section of freezing pipe may be designed into special-shaped ones. The paper briefly introduces the freezing pipe with X-shaped section and made the study on the change rule of temperature field while freezing pipe with X-shaped section being frozen by finite element software. At the same time,by the comparative analysis on the temperature fields of circular-shaped,square-shaped,I-shaped,T-shaped and Yshaped single pipes,the conclusion was drawn that although the sections of X-shaped and other shapes of freezing pipes are noncircular,the temperature of frozen soil is concentric mode distribution with freezing pipe as the center,the nearer to the freezing pipe is,the lower the temperature. While being frozen 20,30 and 40 days,the radius of-10℃ circular frozen wall were to 200 mm,240mm and 300 mm respectively around X-shaped freezing pipe. Compared with circular freezing pipe,the special-shaped ones have advantages of greatly reducing construction electricity comsumption.