北京地区道路不良地基处理设计实例分析及方案比选研究

Analysis on Design Case of Poor Subgrade Treatment of Roads in Beijing Area and Study on Selection of Scheme

近些年,随着城市化进程加快,北京市路网建设外延不断扩大,很多道路建设项目在郊野地区。等级高、线路长的道路建设场地工程地质性质复杂多变。为了保证道路路基稳定,需要对不良地基进行处理,且同一项目中常会用到几种不同形式的地基处理方式,各处理方法均有其自身特点和最优适用条件。施工开始后,随着施工开槽将场地地层情况进一步揭示,设计人员常常要根据现场情况动态调整地基处理方案。结合北京周边机场南线、京良路等高等级城市道路设计实例,从建设场地地质条件分析入手,归纳设计中的控制因素,说明采用不同地基处理方法的设计思路和设计要点,同时对实施过程和后期效果进行评价。

In recent years, with the fast urbanization process and the continuous extension of road network in Beijing, a large number of roads are constructed in the countryside. The engineering geological properties of high-grade and long-line road construction field are complex. In order to guarantee the stable roadbed, it is necessary to treat the poor subgrade. Several different subgrade treatment methods are commonly used in same project. Every treatment method has its characteristics and the optimized applicable conditions. With the construction trenching further to proclaim the stratum of field after construction start, the subgrade treatment schemes are often adjusted according to the field dynamic state. According to the design cases of the high-grade urban roads of the Airport Line(S) in Beijing and Jingliang Road, the article sums up the control factors in the design and illustrates the design thought and design gist of the different subgrade treatment methods from the analysis of geological conditions of the construction field, and also assesses the implementation process and the late effects.