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浃底隧道出口明洞段回填厚度较大而基础土体软弱 ,因此采用了桩 -筏基础的形式以避免过大沉降带来的不利影响。本文对明洞及下部结构建立了三维有限元模型 ,并考虑了土体与结构的共同作用。计算结果表明在软弱地基条件下采用桩 -筏基础能有效地控制不对称恒载作用下结构产生的不均匀沉降
The backfill of the Mingdong section at the bottom tunnel exit is thick and the foundation soil is weak. Therefore, the form of pile-raft foundation is adopted to avoid the adverse effect of excessive settlement. In this paper, a three-dimensional finite element model is established for Myongodong and its substructure, and the common action between soil and structure is considered. The calculation results show that the pile-raft foundation can effectively control the uneven settlement caused by the asymmetrical dead-load under the condition of soft foundation