新建隧道正交下穿既有隧道间距影响分析

Analysis on the Influence of Orthogonal Underpass of New Tunnels on the Spacing of Existing Tunnels

随着我国城市地下交通轨道的不断完善,在新建地下交通路线中会遇到越来越多的既有结构物,且形式会越来越繁杂,新建隧道近距离下穿既有隧道就是最常见的结构形式之一。针对新建隧道正交下穿既有隧道,利用MIDAS GTS-NX和FLAC3D软件对不同间距条件下的下穿隧道进行数值模拟。在此基础上,分析新建下穿隧道正交既有隧道施工间距的影响,确保新建与既有隧道的施工安全和运营安全。

With the continuous improvement of urban underground transportation tracks in China,more and more existing structures will be encountered in the construction of new underground transportation routes,and the forms will become increasingly complex.One of the most common structural forms is the construction of a new tunnel that passes through an existing tunnel at close range.This paper uses MIDAS GTS-NX and FLAC3D software to numerically simulate the orthogonal underpass of new tunnels under different spacing conditions.On this basis,it analyzes the impact of the construction spacing between the new underpass tunnel and the existing tunnel,ensuring the construction and operation safety of the new and existing tunnels.