东北季节冰冻地区公路冻胀与翻浆病害研究

发布时间：2018-02-05 04:56

本文关键词： 季节性冻土地区冻胀翻浆水分温度变形　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：土体中的水热变化及由此引起的应力重分布是引起冻胀与翻浆的主要因素。本文以黑龙江省北安至黑河段、伊春至绥化段以及鸡讷公路的林口至大罗密段为依托，采用现场调查和有限差分数值计算的方法，针对季节冰冻地区防冻胀翻浆道路结构进行系列研究： 1）基于现有的研究成果，结合典型路段温度和水分的实时监测，从水热变化角度分析了路基冻胀与翻浆机理，对影响道路冻胀翻浆机理的的因素进行了详细分析；通过现场调研及资料收集等方法，对黑龙江地区既有道路典型路段的自然环境特征、路基路面病害进行了调查，考虑自然环境特征及冻土特性对沥青道路冻胀融沉进行分类。 2）总结与归纳了国内外季节性冻土地区典型道路结构，分析了各自的优缺点，基于道路冻胀与翻浆发生机理，从路基横断面形式、路基填料、排水设计等方面，，提出了防冻胀翻浆的路基结构。 3）基于伴有相变的冻土区路基温度场控制方程、考虑温度梯度引起水分迁移的冻土路基水分迁移控制方程，应用有限差分软件FLAC3D的流固热耦合模型数值来求解冻土道路变形场模型。 4）建立设置防水垫层道路结构温度场和变形场影响的数值模型，分析了考虑地下水条件下，设置防水垫层结构前后对路基温度场、变形场变化特性的影响，结果表明设置防水垫层能够减弱地下水对道路冻胀和融沉变形的影响。 5）建立了不同埋置位置保温板对道路温度场和变形场影响的数值模型，分析了有无保温板以及保温板埋置不同深度对道路温度场、变形场变化特性的影响，表明道路结构中存在保温板对提高冻融线，减弱冻胀融沉有显著影响。 6）建立了不同护坡道宽度对道路温度场和变形场影响的数值模型，分析了不同护坡道宽度下道路温度场、变形场的变化过程，表明护坡道宽度为3m时保温效果最好、冻胀融沉程度最小。 7）建立了有无粘土层道路结构对道路温度场和变形场影响的数值模型，分析了考虑降雨条件下，有无粘土层结构下道路结构水分场、变形场的变化过程，表明有粘土层的道路结构降低了路基内的饱和度、减弱冻胀融沉的程度。
[Abstract]:The variation of water and heat in soil and the stress redistribution caused by it are the main factors that cause frost heave and slurry. In this paper, the section from Bei'an to Heihe River in Heilongjiang Province is used. Based on the section from Yichun to Suihua and the section from Linkou to Great Rami of Jinien Highway, a series of research is carried out on the road structure of anti-freezing heaving and overturning in the seasonal frozen area by using the method of field investigation and finite difference numerical calculation. 1) based on the existing research results, combined with the real-time monitoring of temperature and moisture in typical road sections, the mechanism of frost heave and slurping of roadbed is analyzed from the point of view of water and heat change. The factors influencing the mechanism of road frost heaving are analyzed in detail. By means of field investigation and data collection, the natural environment characteristics and subgrade and pavement diseases of typical road sections in Heilongjiang are investigated. Considering the characteristics of natural environment and frozen soil, the frost heaving and thawing settlement of asphalt road is classified. 2) summarize and summarize the typical road structure in the seasonal frozen soil area at home and abroad, analyze their advantages and disadvantages, based on the mechanism of frost heave and slurry, from the roadbed cross-section form, subgrade filler. In the aspects of drainage design and so on, the subgrade structure of anti-frost expansion and slurry is put forward. 3) based on the governing equation of subgrade temperature field in permafrost region with phase change, the governing equation of water migration in permafrost subgrade considering temperature gradient. The fluid-solid heat coupling model of the finite difference software FLAC3D is used to solve the frozen soil road deformation field model. 4) establishing the numerical model of the influence of temperature field and deformation field of road structure with waterproof cushion, and analyzing the influence of the structure of waterproof cushion on the temperature field and deformation field of roadbed before and after setting up the structure of waterproof cushion under the condition of groundwater. The results show that the effect of groundwater on frost heave and thawing deformation of roads can be reduced by setting waterproof cushion. 5) the numerical model of the influence of different buried thermal insulation board on the road temperature field and deformation field is established, and the influence of the thermal insulation board and the different depth of the thermal insulation board on the road temperature field and deformation field is analyzed. It shows that the existence of insulation board in the road structure has a significant effect on improving the freeze-thaw line and reducing the frost heave and thawing subsidence. 6) the numerical model of the influence of different slope protection width on road temperature field and deformation field is established, and the variation process of road temperature field and deformation field under different slope protection width is analyzed. The results show that the insulation effect is the best and the degree of frost heave and thawing settlement is the least when the width of slope protection is 3 m. 7) the numerical model of the influence of the road structure with or without clay layer on the road temperature field and deformation field is established, and the changing process of the water field and deformation field of the road structure under the condition of rainfall and without the clay layer structure is analyzed. It shows that the road structure with clay layer reduces the saturation of roadbed and reduces the degree of frost heaving and thawing.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U418.53

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