多年冻土地区钢波纹管涵洞温度场及受力分析研究
发布时间：2018-08-02 16:26
【摘要】：在冻土区进行工程建设遇到的主要问题是冻胀和融沉,特别是高温高含冰量多年冻土路段,极易受工程的影响而产生冻胀抬升或融化下沉,涵洞工程同样会受到这两大问题的困扰[8]。在多年冻土区,路堤和涵洞结构改变了地基的水热交换条件,涵洞基坑的开挖,使多年冻土的温度状况发生变化,而地表温度场的变化,可使原多年冻土地下冰融化,使涵洞基础发生沉降变形;另一方面,含水土层冻结所产生的冻胀作用,可使涵洞地基产生不均匀冻胀变形,甚至使涵洞破坏。而波纹钢管涵是一种柔性结构涵。由于其优良的力学性能,因此具有较强的适应性。在变形较大或易发生不均匀变形的地段,波纹钢管涵、隧道及小桥涵的应用具有非常广阔的前景,且不存在冻胀疲劳破坏。耐久性好,使用寿命长。且有利于快速施工,从而极大的减少了对多年冻土的拢动和破坏,应作为高温多年冻土区的首选涵洞形式,以满足要求[10]。本文的主要内容为:1、对青海地区共和至玉树(结古)公路一期已建的波纹管涵进行资料搜集,并对已建公路进行调查、观测。主要调查内容为:波纹管涵的填土高度及边坡坡度、管涵长度、管涵直径、沿线自然条件、涵洞路基的防护措施及使用状况等。2、同时对共和至玉树(结古)公路B2标K557+499直径3m波纹管涵进行现场试验。分别测试3米波纹管不同位置,在施工过程中随土压力增加的受力情况以及不同车辆荷载双车顺行、双车并行两种工况下3米波纹管涵受力变形情况。同时通过温度传感器得到波纹管涵洞的温度场数据。3、对直径3m的波纹管涵及3*4M的波纹管涵进行有限元模拟分析,分别模拟得到波纹管在车辆荷载下的变形情况以及冻土地区的波纹钢管涵洞的温度场分布特征规律,并由此得出涵洞的变形及冻胀变化规律。
[Abstract]:The main problems encountered in engineering construction in frozen soil regions are frost heaving and thawing settlement, especially the section of frozen soil with high temperature and high ice content for many years, which is easy to be affected by engineering and cause frost heave uplift or thaw subsidence. Culvert engineering will also be plagued by these two major problems [8]. In permafrost region, the structure of embankment and culvert changes the water and heat exchange conditions of the foundation, the excavation of culvert foundation pit changes the temperature state of permafrost, and the change of surface temperature field can make the original permafrost ground ice melt. On the other hand, the frost heave caused by freezing of the water-bearing soil can cause uneven frost heave deformation and even destroy the culvert foundation. The corrugated steel pipe culvert is a flexible structure culvert. Because of its excellent mechanical properties, it has strong adaptability. The application of corrugated steel pipe culvert tunnel and small bridge culvert has a very broad prospect and there is no frost heave fatigue failure in the section where the deformation is large or is prone to inhomogeneous deformation. Good durability and long service life. And it is beneficial to rapid construction, thus greatly reducing the permafrost movement and damage, should be the preferred culvert form in high temperature permafrost region to meet the requirements [10]. The main contents of this paper are as follows: 1. Collecting the data of the corrugated culvert in the first phase of the Gonghe to Yushu highway in Qinghai area, and investigating and observing the constructed highway. The main contents of the investigation are: the fill height of corrugated pipe culvert and slope, the length of pipe culvert, the diameter of pipe culvert, the natural conditions along the line, The protective measures and application status of culvert subgrade. At the same time the field test of K557,499 diameter 3m corrugated pipe culvert of Gong-Yushu (Jiegu) highway B2 standard is carried out. The three meter bellows in different positions were measured respectively, and the mechanical deformation of the 3 meter bellows culvert under the conditions of different vehicle loads and two parallel working conditions were measured. At the same time, the temperature field data of corrugated pipe culvert are obtained by temperature sensor. The corrugated pipe culvert with diameter of 3m and bellows culvert with 3m are simulated by finite element method. The deformation of corrugated pipe under vehicle load and the distribution of temperature field of corrugated steel pipe culvert in permafrost region were obtained by simulation, and the deformation and frost heave variation of culvert were obtained.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U449.83
本文编号：2160009
[Abstract]:The main problems encountered in engineering construction in frozen soil regions are frost heaving and thawing settlement, especially the section of frozen soil with high temperature and high ice content for many years, which is easy to be affected by engineering and cause frost heave uplift or thaw subsidence. Culvert engineering will also be plagued by these two major problems [8]. In permafrost region, the structure of embankment and culvert changes the water and heat exchange conditions of the foundation, the excavation of culvert foundation pit changes the temperature state of permafrost, and the change of surface temperature field can make the original permafrost ground ice melt. On the other hand, the frost heave caused by freezing of the water-bearing soil can cause uneven frost heave deformation and even destroy the culvert foundation. The corrugated steel pipe culvert is a flexible structure culvert. Because of its excellent mechanical properties, it has strong adaptability. The application of corrugated steel pipe culvert tunnel and small bridge culvert has a very broad prospect and there is no frost heave fatigue failure in the section where the deformation is large or is prone to inhomogeneous deformation. Good durability and long service life. And it is beneficial to rapid construction, thus greatly reducing the permafrost movement and damage, should be the preferred culvert form in high temperature permafrost region to meet the requirements [10]. The main contents of this paper are as follows: 1. Collecting the data of the corrugated culvert in the first phase of the Gonghe to Yushu highway in Qinghai area, and investigating and observing the constructed highway. The main contents of the investigation are: the fill height of corrugated pipe culvert and slope, the length of pipe culvert, the diameter of pipe culvert, the natural conditions along the line, The protective measures and application status of culvert subgrade. At the same time the field test of K557,499 diameter 3m corrugated pipe culvert of Gong-Yushu (Jiegu) highway B2 standard is carried out. The three meter bellows in different positions were measured respectively, and the mechanical deformation of the 3 meter bellows culvert under the conditions of different vehicle loads and two parallel working conditions were measured. At the same time, the temperature field data of corrugated pipe culvert are obtained by temperature sensor. The corrugated pipe culvert with diameter of 3m and bellows culvert with 3m are simulated by finite element method. The deformation of corrugated pipe under vehicle load and the distribution of temperature field of corrugated steel pipe culvert in permafrost region were obtained by simulation, and the deformation and frost heave variation of culvert were obtained.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U449.83
【参考文献】
相关期刊论文 前3条
1 刘中良,马重芳;层流管流耦合换热对流体热边界条件的影响[J];北京工业大学学报;2002年01期
2 米隆,赖远明,吴紫汪,张学富;高原冻土铁路路基温度特性的有限元分析[J];铁道学报;2003年02期
3 章金钊;高原多年冻土地区桥涵设计与施工研究[J];中国铁道科学;2001年04期
，本文编号：2160009
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