多年冻土区浅埋建筑物水平冻胀力的理论研究
发布时间：2018-12-14 18:00
【摘要】：摘要：多年冻土区工程建筑物常遭受冻结土体所产生的水平冻胀力而被破坏,由此引起的冻害严重影响了建筑物的服役性能。本文通过对既有研究成果的收集,分析了水平冻胀力的形成机理和影响因素,并采用有限单元法计算了多年冻土区浅埋建筑物水平冻胀力的发展和分布规律,得出结论： (1)温度、土质、含水率对水平冻胀力有显著性影响,且含水率的影响最为显著,同时温度、土质、含水率对水平冻胀力具有明显的交互影响作用。 (2)多年冻土区浅埋建筑物处于双向冻结状态,其温度场是由建筑物的埋深和结构形式共同决定,且不同埋深和结构形式的建筑物中部温度场相互差异较大。 (3)对于刚度较大的浅埋建筑物,水平冻胀力上部最大,沿埋深有减小的趋势,埋深1/3～1/2位置减小最剧烈,埋深中部达最小值。对于刚度较小的浅埋建筑物,水平冻胀力上部最小,沿埋深有增大的趋势,中部达最大值。 (4)不同结构形式浅埋建筑物的水平冻胀力沿埋深的分布形式基本一致,埋深中部数值差别较大,上部和底部数值相差较小。同种结构形式不同埋深建筑物的水平冻胀力沿埋深的分布形式基本相同,埋深中部数值差别较大,上部和底部数值基本相同。 (5)水平冻胀力发展过程可分为四个阶段,即形成阶段-急速增长阶段-缓慢增长阶段-衰减阶段。
[Abstract]:Abstract: engineering buildings in permafrost regions are often damaged by the horizontal frost heaving caused by frozen soil, which seriously affects the service performance of buildings. In this paper, the formation mechanism and influencing factors of horizontal frost heaving force are analyzed, and the development and distribution of horizontal frost heave force of shallow buried buildings in permafrost region are calculated by finite element method. The conclusions are as follows: (1) temperature, soil quality and moisture content have significant effects on horizontal frost heaving force, and the effect of water content is the most significant. Meanwhile, temperature, soil quality and moisture content have obvious interactive effects on horizontal frost heave force. (2) the shallow buried buildings in permafrost region are in the state of bidirectional freezing, and the temperature field is determined by the buried depth and the structure form of the building, and the temperature field in the middle of the building with different buried depth and structure form is quite different. (3) for shallow buried buildings with larger stiffness, the horizontal frost heave force is the largest in the upper part and decreases along the buried depth. The position of 1 / 3 / 1 / 2 of the buried depth decreases sharply and the middle part of the buried depth reaches the minimum value. For the shallow buried buildings with low stiffness, the horizontal frost heave force is the smallest in the upper part, increasing along the buried depth, and reaching the maximum in the middle part. (4) the distribution of horizontal frost heaving force along the buried depth of shallow buried buildings with different structural forms is basically the same, the value of the middle part of the buried depth is quite different, and the difference between the upper and bottom values is relatively small. The distribution of horizontal frost heaving force along the buried depth is basically the same with the same structure form and different buried depth. The value of the middle part of the buried depth is quite different, and the value of the upper part and the bottom is basically the same. (5) the development process of horizontal frost heaving force can be divided into four stages, that is, the formation stage, the rapid growth stage, the slow growth stage and the attenuation stage.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU445;TU311
本文编号：2379068
[Abstract]:Abstract: engineering buildings in permafrost regions are often damaged by the horizontal frost heaving caused by frozen soil, which seriously affects the service performance of buildings. In this paper, the formation mechanism and influencing factors of horizontal frost heaving force are analyzed, and the development and distribution of horizontal frost heave force of shallow buried buildings in permafrost region are calculated by finite element method. The conclusions are as follows: (1) temperature, soil quality and moisture content have significant effects on horizontal frost heaving force, and the effect of water content is the most significant. Meanwhile, temperature, soil quality and moisture content have obvious interactive effects on horizontal frost heave force. (2) the shallow buried buildings in permafrost region are in the state of bidirectional freezing, and the temperature field is determined by the buried depth and the structure form of the building, and the temperature field in the middle of the building with different buried depth and structure form is quite different. (3) for shallow buried buildings with larger stiffness, the horizontal frost heave force is the largest in the upper part and decreases along the buried depth. The position of 1 / 3 / 1 / 2 of the buried depth decreases sharply and the middle part of the buried depth reaches the minimum value. For the shallow buried buildings with low stiffness, the horizontal frost heave force is the smallest in the upper part, increasing along the buried depth, and reaching the maximum in the middle part. (4) the distribution of horizontal frost heaving force along the buried depth of shallow buried buildings with different structural forms is basically the same, the value of the middle part of the buried depth is quite different, and the difference between the upper and bottom values is relatively small. The distribution of horizontal frost heaving force along the buried depth is basically the same with the same structure form and different buried depth. The value of the middle part of the buried depth is quite different, and the value of the upper part and the bottom is basically the same. (5) the development process of horizontal frost heaving force can be divided into four stages, that is, the formation stage, the rapid growth stage, the slow growth stage and the attenuation stage.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU445;TU311
【参考文献】
相关期刊论文 前10条
1 刘鸿绪;法向冻胀力计算——层状空间半无限直线变形体计算在冻土地基中的应用[J];冰川冻土;1981年02期
2 吴紫汪;冻土工程分类[J];冰川冻土;1982年04期
3 徐ei祖,J.L.奥利奋特,A.R.泰斯;土水势、未冻水含量和温度[J];冰川冻土;1985年01期
4 朱强,付思宁,武福学,王忠静,黄军兰;论季节冻土的冻胀沿冻深分布[J];冰川冻土;1988年01期
5 朱林楠;高原冻土区不同下垫面的附面层研究[J];冰川冻土;1988年01期
6 盛洪飞;季冻区桥梁基桩抗冻拔验算几个问题的探讨[J];冰川冻土;1989年01期
7 刘鸿绪;对土冻结过程中若干冻胀力学问题的商榷[J];冰川冻土;1990年03期
8 李萍,徐学祖,陈峰峰;冻结缘和冻胀模型的研究现状与进展[J];冰川冻土;2000年01期
9 梁波,王家东,严松宏,黄志军,杨泉;多年冻土地区L型挡土墙土压力(冻胀力)的分析与试验[J];冰川冻土;2002年05期
10 程国栋,马巍;国际冻土工程研究进展——第五届冻土工程国际学术讨论会综述[J];冰川冻土;2003年03期
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