变异形互通式立交布设控制因素分析

发布时间：2018-08-30 20:29

【摘要】：地形、地质情况复杂的山区高速公路在交通需求上与城市有很大差异,高速公路主线指标比较紧凑。通过石黔高速黑溪互通式立交实例,从立交总体布设、线形指标控制、桥梁布置、路基设置等多个方面对复杂山区非常规变异形互通式立交布设指标进行研究。研究认为互通式立交占地面积大,与山区用地条件的矛盾突出,常规的立交形式对地形、地质条件适应性差,需要对立交布设进行适当变异。复杂山区变异形高速互通式立交总体布置中,利用地形,绕避不良地质条件灵活布线,贯彻安全、舒适、经济的设计理念,立交范围主线及匝道的线形指标需结合桥梁、路基工程进行控制,主线及匝道桥梁工程设置应根据地形、地质情况、施工条件等采用各种墩台形式,注意孔跨及梁型的统一,路基工程应减少弃方,注重不良地质段落防护,路面结构指标需按照主线、匝道及桥面铺装分别选取。
[Abstract]:The Expressway in mountainous area with complicated topography and geology is quite different from the city in traffic demand, and the main line index of the expressway is relatively compact. Taking Heixi interchange of Shiqian expressway as an example, the unconventional variant interchange in complex mountainous area is established in terms of the overall layout of the interchange, the control of the alignment index, the arrangement of bridges, the setting of subgrade and so on. The study shows that the interchange covers a large area and has a prominent contradiction with the land use conditions in mountainous areas. Conventional interchange forms have poor adaptability to topography and geological conditions. It is necessary to make appropriate variations in the layout of interchanges in complex mountainous areas. Flexible wiring, safety, comfort, economic design concept, the main line and ramp alignment index of the interchange area should be combined with the bridge, subgrade engineering control, the main line and ramp bridge engineering settings should be based on the topography, geological conditions, construction conditions and other forms of piers and abutments, pay attention to the unity of span and beam type, Subgrade Engineering should reduce abandonment. Attention should be paid to the protection of bad geological paragraphs, and the pavement structure index should be selected according to the main line, ramp and deck pavement.
【作者单位】：中铁第一勘察设计院集团有限公司;
【分类号】：U412.352.1

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