双层基坑支护计算及设计

为了研究双层基坑计算模型的合理性，以延崇高速公路(北京段)工程妫水河隧道明挖段双层基坑段为案例，通过对比两种不同计算模型的计算结果，结合基坑监控量测结果，提出双层基坑计算时，外侧基坑单独计算即可，内侧基坑的计算模型需考虑外侧基坑的影响，不可仅简化为荷载考虑，希望为类似工程提供借鉴。

Calculation and Design of Supporting for Double-layer Foundation Pit

In order to study the rationality of double-layer foundation pit calculation model, based on the case of the double-layer foundation pit section in the open excavated section of Guishui River Tunnel in Yanqing-Chongli Expressway (Beijing Section), through the comparison of calculation results of the two different calculation models and combined with the monitoring measurement results of foundation pit, it is put forward that the outer foundation pit can be calculated separately during the calculation of double-layer foundation pit, and the influence of outer foundation pit should be considered in the calculation model of inner foundation pit. It is not possible to simplify to load considerations only. The reference is hoped to provide for the similar projects.