Based on some subway foundation pit close to the arch-foot of Tianjin Museum, the study points out the three protection schemes, selects the passive-protection scheme, that is water-cutoff anti-thrust separating wall, by adhering to the safe and economical principle, and proves by the calculation and practice that the deformation of the arch-foot can be controlled in smaller scopes in the excavation process of the foundation pit, so it ensures the smooth implementation of the foundation pit.%鉴于某地铁基坑临近天津博物馆拱脚,提出了三种保护方案,并本着安全、经济的原则,选择了被动保护方案———截水抗推隔离墙方案进行施工,计算与实践证明,基坑开挖过程中,拱脚的变形控制在较小的范围,保证了基坑的顺利实施。
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