Evolution mechanism and treatment measures of water inrush in karst deep buried tunnels
LI Jiankang
CHEN Nuo
BAI Tianwen
XIAO Pengshuai
LIANG bin
LI Wenjie
Abstract：This research takes the Daliangshan No.2 Tunnel Project of Leshan-Xichang Expressway as an example,and based on the filling medium slip theory,the tunnel water inrush model is estab-lished to analyze the stability of surrounding rock in water-inrush section of the tunnel by finite ele-ment software MIDAS GTS NX,and treatment measures are proposed.The results show that the wa-ter inrush process of the tunnel mainly goes through three stages:seepage,water inrush and water burst.The safety factor of the karst pipeline filling body is 0.29 less than the safety value of 1,which indicates that the filling body will slip and become unstable,and then water inrush will occur in the tunnel.The analytical calculation results are consistent with the water inrush on site.The plastic zone in the surrounding rock of the tunnel is first generated around the karst cave and continuously devel-ops towards the free face of the tunnel.Finally,the plastic zone penetrates the tunnel and leads to the occurrence of water inrush.The left arch waist surrounding rock von Mises has the largest stress and large deformation,the maximum stress value is 2.35×103 kPa,and the deformation is significant,the maximum displacement is 119.0 mm,indicating that plastic failure will occur.Cement-water glass double slurry was used for grouting,and the treatment effect of the water inrush section of the tunnel was good,which can provide guidance and in sights for subsequent similar projects.
Keywords：karst tunnelevolution mechanism of water inrushsliding instability of filling mediumnumerical simulationwater inrush control
Publication Date：2025-04-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 72-77 )