山区机场高填方边坡工程实践与研究

在山区机场工程建设中,由于地形地貌的限制,高填方工程一般兼具有地形起伏较大,地质条件复杂,工程量巨大等特点,由此给山区机场带来一系列特殊性工程问题,尤其是高填方边坡工程的稳定性问题是目前机场研究的热点和难点。由于山区机场高填方边坡稳定性问题涉及影响因素较多,为便于分析,从变形机理和控制技术两方面对机场高填方边坡工程问题进行了深入研究。(1)变形机理方面,结合工程实践及对现有资料进行分析归纳,从填筑体下覆坡体结构、降雨及地下水、地震、填料特性、施工工艺等方面研究其对填方边坡稳定性的影响,重点提出了4类填筑体下覆坡体结构类型,并深入分析各类型的变形破坏特征。(2)变形控制技术方面:以"三面一体"控制论为核心,结合实例分析了土方平衡、地基处理及交接面加固、排水、支挡结构四个方面,对高填方边坡变形的控制效果。该研究可为我国山区机场高填方边坡变形机理的深入研究和控制技术的提高和改进提供参考和借鉴。

Engineering Practice and Research on High FillSlope of Mountainous Airport

In the construction of airport engineering in mountain areas, high fill engineering has the characteristics of undulating terrain, complex geological conditions and huge volume of excavation due to the limit of topography. Thus, a series of special engineering problems appears during the construction of airports in mountain areas, especially the stability of high fillings is the hotspots and difficult points in the research field of airport construction. The stability of high fill slope in mountain airport involves many aspects, such as geological structure, lithology, volume of fillings, fillings height, properties of filled material, compaction method, construction quality and drainage. The deformation mechanism and control technology of high fill slope engineering in an airport was well studied in this paper in order to facilitate the analysis. (1) As for the deformation mechanism of the fill slope, the authors first analyze and summarize the existing data. Then the factors that influence the stability of the fill slope were studied combined with the engineering practice. The influences of the underlying slope structure, rainfall and groundwater, earthquake, fillings properties and construction technology are all considered in this research. Next four types of slope structure under filling body were proposed. Finally the deformation and failure behavior of each slope type was analyzed deeply. (2) As for the deformation control technology, on the basis of the control theory of "three-surface integrated", the authors analyze the control effect of high fill slope considering earthwork balance, foundation treatment and reinforcement, drainage and retaining structures for the studied airport. This research has important significance for further understanding the slope deformation mechanism and improving the control technology on high fill slope in mountain airport.