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上海东方路下立交工程,其中一部分基坑的底部与下方隧道(地铁2号线)仅距3 m,如此近的距离使得对隧道变形的控制造成了很大的困难。在具体施工中,基坑分五块开挖并且分块浇筑底板,底板即时与抗拔桩相连。结合该工程,对坑底土样进行室内卸载实验,在此基础上运用数值模拟,与实测变形较一致。同时对不同分块大小和数目的开挖方式进行比较分析,得到隧道变形与上方分块数目的关系以及抗拔桩所起到的作用,并认为这是基坑开挖过程中空间效应的“纵向”发挥,给类似工程以参考。
Shanghai Dongfang Road underpass project, part of the bottom of the pit and the bottom of the tunnel (Metro Line 2) only 3 m away, so close to the tunnel deformation makes the control has caused great difficulties. In the concrete construction, the foundation pit is divided into five sections and the floor is poured in blocks, and the floor is connected with the upright pile immediately. Combined with the project, indoor unloading test on the soil samples at the bottom of the pit was carried out. On this basis, numerical simulation was used, which was in good agreement with the measured deformation. At the same time, the excavation methods of different block sizes and numbers are comparatively analyzed, and the relationship between the tunnel deformation and the number of upper blocks and the effect of anti-pull pile are obtained. It is considered that this is the “ Vertical ”play, to similar projects for reference.