盾构法和浅埋暗挖法结合建造地铁车站的模型试验

MODEL TEST ON METRO STATION CONSTRUCTED BY COMBINATION OF SHIELD METHOD AND SHALLOW-BURIED TUNNELING METHOD

针对目前国内区间盾构施工和车站施工工期矛盾的问题,提出盾构法和浅埋暗挖法结合建造地铁车站的新方案。通过1∶10大比尺模型试验研究,介绍模型地层、开挖方案和支护方案的模拟,比较真实地再现新型车站的施工过程。得到盾构管片应变、收敛变形和洞周土体变位在整个车站施工过程中的变化规律。试验结果表明在模型地层构造和地应力的条件下,采用试验中的施工开挖方案和支护方案能够保证车站洞室在整个施工过程中的安全稳定,证明提出的新型车站施工技术是可行的。

In order to solve the contradiction of construction time limit for running tunnel constructed by shield method and station in China, the new-style station construction method, in which the station is constructed by shield method and mining method, is put forward. In the model test study with scale ratio of 1 ; 10, the simulation of model stratum, excavation scheme and tunnel support scheme are introduced; and the station construction process is reappeared. The variation laws of strain, convergence of the shield segments and displacement of the soil around station tunnel are achieved. The results show that the excavation and tunnel support schemes can ensure the safety of the station under the conditions of model stratum and in-situ stress, by which the feasibility of station construction technology recommended is proved as well.