Investigation of deformation mechanisms in intersecting sections of interchange tunnels using the negative Poisson’s ratio anchor excavation compensation method

Abstract

The study focused on the intersecting section of the Nalong Underground Interchange Tunnel in Shenzhen and investigated the deformation mechanism of the intersecting section under excavation and overloading conditions using physical model tests and numerical simulation methods. First, the optimal similarity ratio was determined based on the tunnel’s actual geometric characteristics, spatial distribution, and engineering geological conditions. A physical model of the intersecting section was then established. Secondly, following the excavation compensation theory, the intersecting section was excavated and supported using scaled Negative Poisson’s Ratio (NPR) anchor cables. The analysis of tunnel stress−strain, displacement, and NPR anchor cable axial force revealed the stress redistribution characteristics of the tunnel during excavation. Subsequently, the tunnel underwent overloading tests to reveal the surrounding rock failure mechanism of the intersecting section. Finally, numerical simulations were used to compare and verify the test results. The deformation mechanism and damage mode of the similar physical model of the intersecting section of Shenzhen Nanlong Underground Interchange Tunnel under the condition of excavation support and overloading are investigated. The support effect of NPR anchors in the intersection tunnel is verified. The study provides a theoretical basis and practical guidance for the design of tunnel excavation and support with similar engineering background.

Graphical abstract

Keywords

interchange tunnel / excavation compensation method / negative Poisson’s ratio anchors / deformation mechanism

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