多年凍土地區(qū)鋼波紋管涵洞溫度場(chǎng)及受力分析研究
發(fā)布時(shí)間：2018-08-02 16:26
【摘要】：在凍土區(qū)進(jìn)行工程建設(shè)遇到的主要問題是凍脹和融沉,特別是高溫高含冰量多年凍土路段,極易受工程的影響而產(chǎn)生凍脹抬升或融化下沉,涵洞工程同樣會(huì)受到這兩大問題的困擾[8]。在多年凍土區(qū),路堤和涵洞結(jié)構(gòu)改變了地基的水熱交換條件,涵洞基坑的開挖,使多年凍土的溫度狀況發(fā)生變化,而地表溫度場(chǎng)的變化,可使原多年凍土地下冰融化,使涵洞基礎(chǔ)發(fā)生沉降變形;另一方面,含水土層凍結(jié)所產(chǎn)生的凍脹作用,可使涵洞地基產(chǎn)生不均勻凍脹變形,甚至使涵洞破壞。而波紋鋼管涵是一種柔性結(jié)構(gòu)涵。由于其優(yōu)良的力學(xué)性能,因此具有較強(qiáng)的適應(yīng)性。在變形較大或易發(fā)生不均勻變形的地段,波紋鋼管涵、隧道及小橋涵的應(yīng)用具有非常廣闊的前景,且不存在凍脹疲勞破壞。耐久性好,使用壽命長(zhǎng)。且有利于快速施工,從而極大的減少了對(duì)多年凍土的攏動(dòng)和破壞,應(yīng)作為高溫多年凍土區(qū)的首選涵洞形式,以滿足要求[10]。本文的主要內(nèi)容為:1、對(duì)青海地區(qū)共和至玉樹(結(jié)古)公路一期已建的波紋管涵進(jìn)行資料搜集,并對(duì)已建公路進(jìn)行調(diào)查、觀測(cè)。主要調(diào)查內(nèi)容為:波紋管涵的填土高度及邊坡坡度、管涵長(zhǎng)度、管涵直徑、沿線自然條件、涵洞路基的防護(hù)措施及使用狀況等。2、同時(shí)對(duì)共和至玉樹(結(jié)古)公路B2標(biāo)K557+499直徑3m波紋管涵進(jìn)行現(xiàn)場(chǎng)試驗(yàn)。分別測(cè)試3米波紋管不同位置,在施工過程中隨土壓力增加的受力情況以及不同車輛荷載雙車順行、雙車并行兩種工況下3米波紋管涵受力變形情況。同時(shí)通過溫度傳感器得到波紋管涵洞的溫度場(chǎng)數(shù)據(jù)。3、對(duì)直徑3m的波紋管涵及3*4M的波紋管涵進(jìn)行有限元模擬分析,分別模擬得到波紋管在車輛荷載下的變形情況以及凍土地區(qū)的波紋鋼管涵洞的溫度場(chǎng)分布特征規(guī)律,并由此得出涵洞的變形及凍脹變化規(guī)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.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U449.83
本文編號(hào)：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.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U449.83
【參考文獻(xiàn)】
相關(guān)期刊論文 前3條
1 劉中良,馬重芳;層流管流耦合換熱對(duì)流體熱邊界條件的影響[J];北京工業(yè)大學(xué)學(xué)報(bào);2002年01期
2 米隆,賴遠(yuǎn)明,吳紫汪,張學(xué)富;高原凍土鐵路路基溫度特性的有限元分析[J];鐵道學(xué)報(bào);2003年02期
3 章金釗;高原多年凍土地區(qū)橋涵設(shè)計(jì)與施工研究[J];中國(guó)鐵道科學(xué);2001年04期
，本文編號(hào)：2160009
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