永古高速公路旧路拓宽路基差异沉降处治技术研究

发布时间：2019-01-09 08:05

【摘要】：由于交通量增长速度迅猛,我国早期修建的高速公路交通量已近饱和,对现有公路改扩建已成必然。旧路加宽扩建成为最直接、有效的解决途径。而公路工程加宽扩建在我国尚无成熟的工程经验,现行规范对于公路扩建加宽的设计和施工也涉及较少。与新建公路工程相比具有施工难度大、工艺复杂、交通干扰大、质量要求高等特点。用新建工程的设计方法和施工方法不能解决改扩建工程面临的问题。为解决永登至古浪高速公路旧路利用段差异沉降等问题,提高永古高速公路通车运营后路用性能,亟需对旧路加宽方案进行研究、论证,提出合理的施工工艺和工程措施,确保工程建设质量。论文依托永登至古浪高速公路建设项目旧路加宽段工程,在广泛收集、分析国内外旧路加宽资料的基础上,初步确定永古高速公路旧路加宽方案,结合室内土工试验参数,采用数值分析和理论公式验算,得出不同加宽方式下路基沉降规律,对依托工程沿线过湿黄土地基旧路利用方案进行优化,提出适合过湿黄土地区旧路加宽的综合工程处治措施和施工控制要点。为验证旧路加宽设计方案的合理性,在旧路加宽路基横断面埋设测试元件,进行工后沉降监测分析。经永古高速公路工程实体工程验证:本文提出的土工格室用于防治旧路加宽路基纵向裂缝的处治方案工程应用效果良好,证明技术上是可行的,可供类似工程借鉴。
[Abstract]:Due to the rapid growth of traffic volume, the traffic volume of the expressway built in the early period of our country is nearly saturated, which is inevitable for the reconstruction and expansion of the existing highway. Widening and extending the old road becomes the most direct and effective way to solve the problem. However, there is no mature engineering experience in our country for widening and widening of highway engineering, and the current codes are less involved in the design and construction of road widening. Compared with the new highway engineering, the construction is difficult, the technology is complex, the traffic interference is large, and the quality requirement is high. The design method and construction method of the new project can not solve the problems faced by the reconstruction and extension project. In order to solve the problem of differential settlement of the old section of Yongden-Gulang Expressway, and improve the performance of the Yonggu Expressway after it is opened to traffic, it is necessary to study and demonstrate the widening scheme of the old highway, and put forward reasonable construction technology and engineering measures. Ensure the quality of project construction. Based on the widening section of the old road of Yongden-Gulang Expressway construction project, based on the extensive collection and analysis of the old road widening data at home and abroad, the paper preliminarily determines the widening scheme of the old road of Yongdeng-Gulang Expressway, and combines with the indoor geotechnical test parameters. By means of numerical analysis and theoretical formula checking calculation, the settlement law of roadbed under different widening modes is obtained, and the utilization scheme of old road of overwet loess foundation along relying engineering is optimized. This paper puts forward comprehensive engineering treatment measures and construction control points suitable for widening old roads in overwet loess area. In order to verify the rationality of the widening design of the old road, the test elements are embedded in the cross-section of the widening roadbed of the old road to monitor and analyze the settlement after construction. Verified by the entity engineering of Yonggu Expressway: the geogrid chamber proposed in this paper is used to prevent and cure longitudinal cracks in widening roadbed of old road with good application effect, which proves that it is technically feasible and can be used for reference in similar projects.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1

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