邻近地铁车站配套地下结构建造方案研究

北京地铁16号线稻香湖站配套的地下结构紧邻地铁车站北侧布置,并与车站北侧共用围护桩。由于两结构之间设置人防门和行人通道,需要截除共用围护桩。原设计的配套地下结构建造工序安排将会对地铁车站运营产生不利影响。考虑到对地铁车站运营产生影响的工序主要是共用围护桩的截除,提出的方案是:先完成配套地下结构的负二层结构浇筑,然后将负一层结构划分为3个建造单元,每个单元分别采用不同的建造方案。施工关键工况的数值模拟分析结果表明:分单元建造方案对配套地下结构中板受力状态等并没有产生明显的不利影响,围护桩的变形监测结果也表明分单元建造方案能够满足围护桩的安全要求。该配套地下结构建造方案已成功实施,为今后地铁车站配套地下结构建造方案设计提供参考。

Study on Construction Scheme for Attached Underground Structures Adjacent to Subway Station

The underground structures of the Daoxianghu subway station of Beijing metro line 16 are adjacent to the north side of the subway station,sharing the same retaining piles with the north side of the station. For the needs of subway civil air-defense gates and pedestrian passages,the common retaining piles need to be cut off. The original design of the underground structures would have adverse effects on the operation of the subway station. Considering the impact on subway station operation due to the cutting of the retaining piles, this paper proposes the scheme that the 2 nd basement of the underground structures is constructed first,the 1 st basement is divided into three parts, and each part usesdifferent construction scheme. The results of the numerical simulation of the key construction conditions show that the proposed scheme has no obvious adverse effect on the middle plate structural stress. The monitoring results of retaining piles deformation also indicate that this scheme can meet the safety requirement of the retaining structure. The construction scheme of underground structures has been successfully implemented, providing references for future construction scheme design of attached underground structures to the subway station.