【作者】 杜艳军；

【导师】 鲍明伟；

【作者基本信息】 东北林业大学 ， 道路与铁道工程， 2005， 硕士

【摘要】 近些年来,随着国民经济持续高速发展,高等级公路的建设正以前所未有的发展速度向前推进。鉴于我国人口众多,土地等不可再生资源的日趋宝贵和紧张的特点,用发展和长远的眼光看:高等级公路的加宽改建工程将是我国本世纪初公路建设所面临的非常重要和必须解决的问题。目前我国高等级公路加宽改建工程刚刚起步,国内尚无具体的设计和施工技术规范。与新建公路相比,旧路加宽改扩建工程具有施工难度大、工艺复杂、质量要求高等特点。对这方面的研究在我国是个新的课题,因此具有重大的意义。 在公路加宽改建工程中,如何保证新旧路基,特别是软土地基上的新旧路基不发生过大的差异沉降,以减轻或避免路面因此而产生变形、开裂,是迫切需要解决的问题。本文从旧路加宽改建工程的主要问题入手阐明了控制新旧路基差异沉降的必要性,分别从地基条件、荷载、加宽宽度、压实度等四个方面阐述了对新旧路基不均匀沉降的影响。本文还对旧路加宽路堤的沉降变形机理和不同工况下的路堤沉降的计算方法进行了有益的探讨。接着紧密联系工程实际,阐明了土工合成材料应用于旧路加宽路堤的作用机理,并通过计算分析说明了土工合成材料减少新旧路基不均匀沉降的效果。 文章的最后给出了本文的主要结论和进一步加强旧路加宽理论分析的几点建议。更多还原

【Abstract】 In recent years, with the rapid development of economic construction in our country, high-grade highway construction is evolving with unexampled speed. Because of the large population and the scarcity of the soil resource in today’s China, We can foresee: the widening and rebuilding of highway is very important matter that we must account for at the beginning of the new century. China is now just in the early stage of widening and rebuilding of high-grade highway, hence no detailed design and construction specification can be found within the mainland of China. In comparison with the highway to be constructed, the project of widening and rebuilding is characterized by the following features: difficult and tough construction techniques and high-quality requirements etc. The research of this technique is a new subject in our country. Therefore, it is of much importance.In the process of widening and rebuilding the used road, how to assure the new and old embankment, especially on soft ground, not occurring significantly different settlement and minimizing the deformation and crack of the pavement is a problem to be solved simultaneously. In this paper, based on the problems of the widening and rebuilding the used road, expatiates the importance of controlling different settlement of the new and old embankment, and the effects of ground、 load 、 width and compression ratio. According to different environment, the paper also discusses the deformation characteristics and the settlement computing method of the widening embankment structure. Then, contacts with the fact in the engineering, analyzes the mechanism of geosynthetics in the widening embankment structure, moreover, through computing and analyzing the paper introduces the effects of the geosynthetics which reducing different settlement of the new and old embankment.In the end, there are some this paper’s main viewpoints and recommendations on improving the research of theoretical analysis of widening the used road.更多还原