先隧后站(井)法关键技术研究现状及展望

Present Status and Prospect of the Study on Key Technologies of Tunnel Ahead and Station (Shaft) Following Method

  • 摘要: 先隧后站(井)法具有施工工期短、占用场地面积小、对周围环境影响小等优点。通过对18个先隧后站(井)法施工的实际工程案例进行总结和综述,将先隧后站(井)法分为两大类:先隧后站法和先隧后井法。先隧后井法可分为无横通道的先隧后井法和有横通道的先隧后井法,其中无横通道的先隧后井法又可根据隧道和竖井的尺寸大小,分为大井小隧法和小井大隧法。对先隧后站(井)法施工过程中的关键技术,如先隧后站法扩挖地铁车站的几种形式、基坑的支护形式、管片破除方式等进行了总结,得到了基坑支护形式的选用条件等可应用于先隧后站(井)法工程实践的有益结论,并对先隧后站(井)法未来在工程应用、数值模拟等方面的研究方向进行了展望,可为先隧后站(井)法在我国的推广和应用提供参考和借鉴。

     

    Abstract: The tunnel ahead and station (shaft) following method has the advantages of short construction period, small site area and slight influence on the surrounding environment. Based on the summary and review of 18 practical engineering cases of the construction with tunnel ahead and station (shaft) following method, the method is classified into two categories: tunnel ahead and station following method and tunnel ahead and shaft following method.The tunnel first and shaft following method can be classified into the one for construction without cross passage and the one for construction with cross passage. And the tunnel ahead and shaft following method for construction without cross passage can also be classified into the large-shaft and small-tunnel method and the small-shaft and largetunnel method according to the size of the tunnel and shaft. This paper summarizes the key technologies in the construction process with the tunnel ahead and station (shaft) following method, such as several forms of expanding subway station excavation, supporting form of foundation pit and segment breaking mode with tunnel first and station following method, draws a useful conclusion that the selection conditions of foundation pit support can be applied to the engineering practice with tunnel ahead and station (shaft) following method, looks forward to the future research direction of the tunnel ahead and station (shaft) following method in engineering application, numerical simulation,which provides reference for the promotion and application of tunnel ahead and station (shaft) following method in China.

     

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