风沙地区高速公路路基防护技术研究

发布时间：2018-11-11 18:02

【摘要】：甘肃是我国沙漠分布的主要省份之一,随着西部大开发政策的推广实施,未来将会有更多的公路包括高速公路穿越省内的沙漠地区,但是目前省内还没有一整套设计经验。为了保证高速公路的安全畅通,风沙对公路的危害必须降至最低。本次研究所依托项目是甘肃省第一条风沙地区高速公路。通过对全线复杂多变的风沙地形进行细致地调查,查阅相关参考资料及科研成果,经过计算分析和方案比选,对高速公路风沙路基防护措施进行研究,采用工程类比以及施工期间效果的观测来验证方案的可行性,并以此完善设计、指导施工。本文研究的主要内容根据沙害对路基的危害分为两个方面。第一、减轻路基风蚀为主的路基防护措施,如防止路基掏空风蚀而采取的防护措施的研究,如路基的填土高度、路基填料、边坡防护措施及土工材料的应用等。第二、减轻风沙通过路基而致沙粒沉落以及沙丘对路基的掩埋而采取的防护措施的研究。如路基横断面的选择,工程防沙体系的建立等。为完成研究目标,本文通过现场调查和有关资料的收集整理,分析环境气候影响因素;通过对参数的计算分析,获得研究区风沙活动和风沙危害特征,主要有临界起动风速、输沙量、主导风向、沙源分布等;在进行路基的稳定性研究时,分析了路基损坏的原因和影响因素,同时参照区域旧路的风沙侵蚀状况和实体工程的建设情况,以此来确定路基横断面形式。针对不同路段的风沙危害特征提出相应的路基边坡防护形式以及工程防护体系,从而总结设计经验,完成研究报告。以最终能够形成一个系统的适合甘肃省实际的风沙地区高速公路路基防护的完整经验资料,并对以后的建设提供一些参考。
[Abstract]:Gansu is one of the major desert provinces in China. With the promotion and implementation of the western development policy, there will be more highways, including highways, passing through the desert areas of the province in the future, but there is not a complete set of design experience in the province at present. In order to ensure the safety and smooth of highway, the harm of wind sand to highway must be reduced to the minimum. This institute relies on the project is the Gansu Province first wind sand area highway. Through the careful investigation of the complex and changeable wind-sand terrain along the whole road, the relevant reference materials and scientific research results are consulted, and the protective measures of wind-sand subgrade of the expressway are studied through calculation, analysis and scheme comparison. The feasibility of the scheme is verified by using the engineering analogy and the observation of the effect during construction, and the design is perfected to guide the construction. The main content of this paper is divided into two aspects according to the harm of sand damage to roadbed. First, the main measures to reduce the roadbed wind erosion, such as the study of the protection measures, such as the height of the embankment, the filling of the roadbed, the slope protection measures and the application of geotechnical materials, etc. Second, the study on the measures to reduce sand subsidence caused by wind sand passing through the roadbed and the sand dune burying the roadbed. For example, the selection of subgrade cross section, the establishment of sand prevention system. In order to achieve the research goal, this paper analyzes the environmental climate influence factors through the field investigation and the collection and collation of related data. Through the calculation and analysis of the parameters, the characteristics of wind-sand activity and wind-sand hazard in the study area are obtained, including critical incipient wind speed, sediment transport amount, dominant wind direction, distribution of sand source, etc. In the study of roadbed stability, the causes and influencing factors of roadbed damage are analyzed, and the cross-sectional form of roadbed is determined by referring to the status of wind-sand erosion of the old road in the region and the construction of solid engineering. According to the characteristics of wind and sand hazard in different sections of road, the corresponding protection forms of roadbed slope and engineering protection system are put forward, and the design experience is summarized and the research report is completed. In order to form a systematic experience of highway roadbed protection in the wind-sand area of Gansu Province, this paper provides some references for future construction.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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