北京地铁10号线国贸站降水设计计算合理性分析

Rationality Analysis of the Design and Calculation of Dewatering in Guo Mao Station of Beijing Metro Line 10

北京地铁10号线国贸站采用暗挖法施工,下穿南北向国贸桥、东西向大北窑桥,并下穿地铁1号线,其中,南北向国贸桥的南段为连续梁结构,对不均匀沉降极为敏感,且工程所在地段地下管线密集,附近重要建筑林立。针对工程具有站体开挖深度内涉及多个含水层、降深大、排水量大的特点,本着降水均匀沉降原则,对主站体及高架桥连续梁区段采用适当扩大降水范围的办法,进行降水设计,以保证暗挖站体的正常施工,并避免因降水造成高架桥区及已有地铁1号线结构的不均匀沉降,经实践证明,效果良好。

The subway station of Guo Mao in Beijing Metro Line 10 is used subsurface excavation method. Down-traversing Guo Mao Bridge that is from south to north and Da Bei Yao Bridge which is from east to west, and down-traversing subway line 1. The south part of Guo Mao Bridge is continuous beam structure, which is extremely sensitive to the uneven settlement, plus underground pipelines are very intensive and existing important buildings are nearby. In the face of the characteristics of multiple aquifers, deep drawdown, large displacement in this excavation depth, and in line with the principle of uniform settlement of dewatering. We design the solution of dewatering by using the method of expanding the scope of dewatering for the main station and continuous beam of the viaduct, so as to ensure the construction of subsurface excavation of the station and to avoid the uneven settlement of continuous beam of the viaducts and the structure of existing subway line. The practice proves that the result is good.