基坑开挖对既有隧道结构影响分析

Analysis of influence of excavation on existing tunnel structure

在实际工程中,如何减小基坑开挖对既有下卧隧道结构的影响,成为当前学术界和工程界关注焦点。结合具体工程实例,通过对基坑下卧隧道结构的保护分析,提出基坑及地下结构相协调的合理施工方案。通过提前建造地铁隧道两侧支护桩及盖板等地下结构,可较为有效地减小了基坑开挖对地铁隧道影响,且基坑开挖及地下水位恢复都将对隧道结构变形及内力产生较大影响。

In practical engineering,how to reduce the influence of foundation pit excavation on existing tunnel structures has become the focus of academic and engineering attention.The reasonable construction scheme of foundation pit and tunnel structures is put forward through the protection analysis.The construction of underground structures such as the pile and cover plate on both sides of the subway tunnel in advance can effectively reduce the influence on the subway tunnel.And the excavation of the foundation pit and the recovery of the groundwater level will have a great influence on the deformation and internal force of the tunnel structure.