寒区浅埋工程构筑物的水平冻胀力实验及理论研究

项目名称： 寒区浅埋工程构筑物的水平冻胀力实验及理论研究

项目编号： No.41271072

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 天文学、地球科学

项目作者： 田亚护

作者单位： 北京交通大学

项目金额： 75万元

中文摘要： 寒区工程构筑物常遭受冻结土体所产生的水平冻胀力破坏，而水平冻胀力主要受土体的冻结状态（一维冻结还是二维冻结）、构筑物对冻胀土体的约束程度和土的冻胀性三方面影响。本研究通过现场试验，分析了"U"型、梯形和矩形这三种结构形式的钢筋混凝土槽在埋深分别为0.7m和1.2m这六种工况下，水平冻胀力发生及发展变化规律；通过室内足尺模型试验，分析矩形槽水平冻胀力随冻结速率、土性和含水量不同的变换趋势；最后通过对试验结果分析和数值理论计算，研究寒区浅埋工程构筑物的水平冻胀力形成的机理、特性及影响因素，并提出寒区浅埋工程构筑物的水平冻胀力计算方法。

中文关键词： 多年冻土区；浅埋建筑物；水平冻胀力；热-力耦合；

英文摘要： Because of the horizontal frost-heaving force of freezing soil, many engineering structures often fail in cold region. The horizontal frost-heaving force are mainly influenced by frozen condition (one-dimensional freezing or two-dimensional freezing), constraint degree from structure and frost heaving characteristics of soil. The occurrence reasons and variation regularities of horizontal frost-heaving force are analyzed according of the test results of three kinds of reinforced concrete structures of drainage channel on site, which are U-shape, laddertype and rectangularity, and the buried depths of three kinds of drainage channels are 0.7m and 1.2m respectively under the ground. On the basis of indoor large-scale test data, the characteristics of horizontal frost-heaving force of rectangularity channel are researched with the variation of freezing rate, soil property and water content. Finally, the occurrence mechanism, characteristics and influencing factors of horizontal frost-heaving force are discussed and its calculation method is given according of the results of tests and numerical simulation.

英文关键词： permafrost region；shallow foundation；horizontal frost-heaving force；thermo-mechanical coupled；