北京地区深层地铁车站土建可实施性研究

Research on Civil Engineering Practicability of Deep Subway Station in Beijing

轨道交通形成的大型网络已由浅层空间迅速向深层空间发展,北京地区能否在超30 m埋深富含承压水的土质地层中修建地铁车站仍存疑问。首次提出了解决这一技术难题的思路,通过对可行方案的详细比选,重点对现阶段土建可实施性较强的全分离式站型进行了系统研究。结论表明:1)暗挖堵水是深层地铁车站建造方法研究的突破口;2)全分离式新站型更具可实施性、典型性及应用前景,核心需解决承压水地层的注浆效果问题;3)深层地铁车站土建工程仍存在实施难度大、风险高、造价高、建设时间长等问题,各种工法在实践应用上尚需深入研究。研究成果不仅可以为北京地区乃至全国深层地铁建设的科学决策提供依据,而且也为城市地下空间开发和可持续发展起到引领作用。

A large rail transit network has been developed rapidly from shallow to deep space,whether subway station can be constructed in over 30 meters depth soil strata rich of confined water in Beijing area remains in doubt. Ideas to solve the technical problem were firstly put forward,many possible schemes were compared and selected in detail,and then whole separate station type with great civil engineering practicability in present stage was researched systematically. Results indicate that,1） mining method with water plugging is a breach in the research of deep subway station construction method; 2） the whole separate new station type is more practical,typical and application prospective,and the core is to solve the grouting effect problem in confined water strata; 3） there are still some problems in deep subway station civil engineering,such as difficult implementation,high risk,high construction cost,long civil construction time,and application of all sorts of methods still needs to be studied further. The research not only provides basis for scientific decision of deep subway construction in Beijing and even the whole country,but also plays a leading role for the exploitation and sustainable development of urban underground space.