为满足北京城市副中心地下交通枢纽区域内的城市道路先行投入运营的需求,提出采用盖挖法与明挖法组合方法进行地下枢纽基坑开挖与支护的方案,主要特点如下:(1)将地下交通枢纽基坑分割为“盖挖基坑、明挖基坑和多级放坡基坑”等3个并列布置基坑;(2)盖挖区基坑与明挖基坑共用围护结构;(3)先完成盖挖区顶板结构施工,恢复城市道路运营,然后采用逆作法完成盖挖区负一层施工,随后同步开挖支护盖挖区两侧的明挖基坑和放坡区基坑;(4)盖挖区负二层和负三层采用顺作法施工。论文详细阐述了盖挖与明挖组合工法的施工工序,分析了组合工法的优势。鉴于盖挖区钢管柱始终处于基坑开挖扰动中,为此采用数值模拟方法并结合现场监测结果,分析了基坑开挖期间的钢管柱变形规律。结果表明,钢管柱水平变形和隆起变形指标均满足控制要求。本文提出的盖挖与明挖组合建造方案不但能确保地下交通枢纽区域内的城市道路尽快投入运营,而且并列基坑群中的3个基坑开挖支护及结构浇筑基本上相互独立,有效降低了盖挖区和明挖区基坑施工的相互影响,提高了施工效率。
In order to meet the need of the urban road above the underground traffic hub of Beijing sub-center put into operation first, a construction scheme combining cover excavation and open excavation is proposed. The main characteristics of the scheme are as follows: 1) The foundation pit of the underground transportation hub is divided into three parallel layout pits, namely “cover excavation pit, open excavation pit and slope excavation pit”;2) The supporting structure is shared between cover excavation pit and open excavation pit;3) First, the roof structure construction of the cover excavation area is completed to resume the urban road operation as soon as possible, and the negative layer construction of the cover excavation area is carried out by the reverse method, and then the open excavation pit and the slope excavation pit on both sides of the cover excavation area are simultaneously excavated;4) The negative second floor and negative third floor of the cover excavation area is constructed by open excavation method. The paper elaborated the construction procedure of the combined method of cover cut and open cut and analyzed the advantages of the combined method. Considering that the steel tube column in the cover excavation area is always disturbed by the excavation of the foundation pit, the deformation law of the steel tube column during the excavation of the foundation pit is analyzed by the numerical simulation method combined with the site monitoring results. The results show that the horizontal deformation and uplift deformation of steel tube column meet the control requirements. The combined construction scheme of cover cut and open cut proposed in this paper can not only ensure that the urban roads in the underground transportation hub area can be put into operation as soon as possible, but also each foundation pit excavation and structure pouring are basically independent of each other, effectively reducing the mutual influence of the foundation pit construction in cover cut area and open cut area, and improve the construction efficiency.
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