浅埋暗挖法施工中结构受力的合理转换

Reasonable stress transfer in structures during the construction of bored shallow tunnels

文章针对浅埋暗挖法施工中结构受力转换的问题,结合某地铁工程实例,介绍了几种对控制沉降比较有效的施工方法。在竖井开挖到通道顶标高后提前对通道顶部土体进行加固,并施作短柱暗梁,有效地保证了结构安全和土体稳定;在通道转入双联拱正洞的施工中采用增设洞门加固环和通道顶部加强拱等措施,成功地解决了通道格栅破除后通道的稳定问题,并有效地控制了地层下沉;通过对现场一手监测数据的深入分析,结合自己的施工体会,总结出了一些较为珍贵的施工经验,对类似工程设计和施工有一定的参考价值。

This article studies the stress transfer in structures during the construction of bored shallow tunnels with some subway projects as the background, and introduces some effective measures to control surface subsidence： reinforcing the crown soil mass of a passage before the shaft excavated to the top of it; erecting a short beam on col- umns to guarantee structure security and soil mass stability; in the construction process from the passage to double - arch tunnel, placing additional portal reinforcement at tunnel entrance and fabricating an arch on the crown of the passage that successfully ensured the stability of the passage after removal of the lattice arches and with the settlement of soil mass effectively controlled. Through analyzing the first - hand monitor data rigorously and incorporating their own practice, authors of the paper summarized some experiences which can be taken for reference by similar engineering design and construction.