人工地层冻结有限厚度冻土帷幕自然解冻规律  

Natural Thawing of Frozen Soil with Limited Thickness by Artificial Ground Freezing

作　　者：肖朝昀[1] 胡向东[2,3] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021 [2]同济大学土木工程学院地下建筑与工程系,上海200092 [3]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《华侨大学学报（自然科学版）》2010年第6期674-679,共6页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(50578120)

摘　　要：采用数值方法分析单排和多排冻结管形成的冻土帷幕自然解冻规律,以及冻土帷幕完成解冻所需的时间及平均解冻速度随厚度的变化.研究结果表明,对于有限厚度冻土帷幕自然解冻,相变所需的时间占主要部分.单排冻结管形成的冻土帷幕,相变所需的时间占整个解冻时间的90%左右;多排冻结管形成的冻土帷幕,相变所需的时间占整个解冻时间的随排间厚度的增加,从80%下降至60%.此外,单排管冻结形成的冻土帷幕自然解冻,其解冻时间和平均解冻速度与厚度大致呈抛物线关系;而多排管冻结形成的冻土帷幕自然解冻,其解冻时间和平均解冻速度与厚度大致呈线性关系.Natural thawing of frozen soil with limited thickness by artificial ground freezing using numeric method is studied.The temperature field of the frozen soil and the thawing time,as well as the average thawing velocity against the thickness of frozen soil wall formed by single-row or multi-row of freeze tubes are analyzed.For the natural thawing of frozen soil with limited thickness,phase change time dominates the entire thawing time.The phase change time of frozen soil by single-row freeze tubes is 90% of the entire thawing time;for multi-row freeze tubes,the phase change time is 80%~60% varied with the thickness of the frozen soil.It is shown that approximate parabola relationships exist between the thawing time,as well as thawing velocity against the thickness of frozen soil wall formed by single-row freezing,and approximate linear relationships exist in the frozen soil wall formed by multiple-row freezing.

关 键 词：人工冻结技术 自然解冻 人工地层 冻土帷幕 相变 解冻速度 

分 类 号：TU472.9[建筑科学—结构工程]