Work

Three-Dimensional Refined Modeling and Mechanical Response Analysis of Tunnel Structure Safety in Karst Areas

Year: 2025

Type: article

Abstract: Deep-buried tunnels in karst regions are prone to complex deformation and stress redistribution due to the heterogeneity of surrounding rock and the presence of cavities. This study establishes a three-dimensional finite element model to investigate the mechanical behavior of tunnel linings under varying karst distributions and distances. The model incorporates realistic geological parameters and boundary conditions to analyze stress evolution and radial displacement of the lining under coupled mechanical effects. The results indicate that karst cavities located near the tunnel, especially beneath it, significantly amplify radial deformation and induce asymmetric stress concentrations. As the distance between the karst and the tunnel increases, the influence on lining response rapidly decreases and becomes negligible beyond approximately 3 m. The introduction of a secondary lining effectively reduces both tensile and compressive stresses by more than 65% and mitigates local deformation. The study concludes that the spatial position of karst features is the dominant factor affecting lining performance, and the composite lining structure provides an efficient means of ensuring safety and stability in water-rich karst tunnels.

Source: Infrastructures

DOI: 10.3390/infrastructures10110315

Authors: Guansi Gu, Fei Yang, Yunhao Dong, Wei Liu, Mingze Xu

Institutions: Powerchina Huadong Engineering Corporation (China), City University of Hong Kong, Changzhou University

Language: English

Topic: Geotechnical Engineering and Underground Structures

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $2,172