大型全地下刚性填埋场结构设计

Structural Design of Large-scale Full Underground Rigid Landfill

摘要:

在地下空间结构中，外墙设计是否合理直接影响工程造价及结构安全。在构建整体模型中，通常假定地下大空间楼板为平面内无限刚。但对于楼板存在边跨开洞、不连续、板墙刚度比较小等情况，外墙与楼板连接处仍采用铰接则不符合板墙实际受力。在实际工程中，当楼板平面内刚度相比外墙抗弯度较小时，深埋地下结构外墙的跨中弯曲变形及支撑薄板平面内变形较大，会引起外墙内力的重分布，若不考虑则会引起较大的计算误差。因此在板墙计算分析时，结构外墙的边界条件实际为刚度变化的弹簧支座，在设计上应依据有限元计算结果采用相应的加固措施。基于日照综合客运站北广场地下空间建筑工程对地下室外墙进行有限元计算，提出深埋大空间结构外墙结构设计优化方案。

Abstract:

Through an engineering example, the key points of structural design of a large full underground rigid landfill in Sichuan are analyzed. Combined with the design process, the buttress retaining wall and box section cantilever retaining wall are applied to the full underground rigid landfill. The stress states of the two retaining walls in the landfill are analyzed, which provides a sufficient basis for the design selection and reinforcement design of the cross section. Based on the site conditions, the bottom plate of landfill is designed by subzone according to the different stress conditions, and the economic efficiency and engineering reliability are also balanced.