北京歌舞剧院大埋深地下结构设计

Design of underground structure with large buried depth for Beijing Dance Drama and Opera

北京歌舞剧院结构基底标高-22.600m,采用震振双控技术,在地下室基础底板底和挡土墙外侧设置减振垫,同时在标高-12.400m设置层间隔震(振)层。最大水头高达16.400m,减振垫限制了采用抗拔锚杆或抗拔桩抗浮,且观众厅和舞台区域自重轻,对大埋深地下结构抗浮提出了挑战;高悬臂挡土墙生根于隔震(振)层,向上局部收进,最大挡土高度约为15.590m,墙体边界约束条件及传力路径复杂。针对上述关键问题,提出利用配重抗浮、加厚基础底板、地下室结构考虑水浮力影响的设计方法;采用基底减振目标刚度计算分析基础底板和地下结构的抗浮稳定、承载力及变形,对基础上部结构和基础进行协同设计,有效解决了基底减振加层间隔震(振)条件下结构整体和局部抗浮设计难题;最后采用三维整体建模方法模拟挡土墙复杂边界,计算挡土墙的变形及内力,并对比多跨连续梁模型计算结果,为高悬臂挡土墙结构设计提供了依据。

Dual control of vibration and seismic is used in Beijing Dance Drama and Opera,whose foundation bottom elevation is-22.600m.Vibration isolation pads are installed at the bottom of basement foundation slab and outside retaining wall,and interval seismic(vibration)isolation layer is installed on at the elevation-12.400m.The maximum water head is 16.400m.Using anti-uplift anchor and anti-uplift pile to prevent floating are limited by the vibration isolation pads,and in addition,self-weight of the theater audience hall and stage are very light,which challenges the anti-floating design of underground structure with large buried depth.Boundary conditions and force transmission paths are complex,due to that the high cantilever retaining wall starts from the isolation layer and setbacks in partial area,and the maximum height of retaining wall is about 15.590m.In view of the above key problems,the design method was proposed that using balance weight to resistant uplift,thickening the basement bottom plate and considering the influence of water buoyancy for basement structure.The anti-floating stability,bearing capacity and deformation of the basement bottom plate and underground structure were calculated and analyzed by using target stiffness of vibration isolation at the basement bottom,and the collaborative design of the foundation superstructure and foundation was carried out,which effectively solves the problem of the overall and local anti-floating design of the structure under the condition of vibration isolation at the basement bottom and interval seismic(vibration)isolation between floors.Finally,comparing with calculation of multi-span continuous beam model,the three-dimensional integral modeling method was used to simulate the complex boundary of the retaining wall,and to calculate the deformation and internal force of the retaining wall,which provides basis for high cantilever retaining wall.