GUO J Q, WANG E B, LAI Y B ,et al.Three-dimensional discrete element analysis of the water inrush process of the intermittent fissure tunnel face in a karst tunnel[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(4):156-161.

doi:10.16186/j.cnki.1673-9787.2021050020

Received:2021/05/07

Revised:2021/07/25

Published:2023/07/25

Three-dimensional discrete element analysis of the water inrush process of the intermittent fissure tunnel face in a karst tunnel

GUO Jiaqi1, WANG Erbo1, LAI Yongbiao2, YANG Weiling1

1.School of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.China Construction Railway Investment Construction Group Co.，Ltd.，Beijing  102601，China

Abstract:In order to explore the changes laws in the displacement，seepage field and karst water pressure of the anti-outburst structure under the intermittent fissure with different inclination angles during the excavation of the karst tunnel，numerical simulation analysis and research were carried out by using three-dimensional discrete element software.A calculation model of water inrush from the face of intermittent fissure in a karst tunnel was constructed，and the change process of multiple physical informations of the anti-outburst rock mass was simulated and analyzed when a water inrush disaster occured in the tunnel.The results showed that the maximum displacement point of the tunnel face was usually located at the junction of the crack and the tunnel face；When the inclination angle of the fissure increased from 20° to 45°，the water pressure presented an increasing trend，and the inclination angle increased from 45°to 70°，the water pressure value at each position gradually decreased；As the inclination angle of the karst fissure increased，the maximum flow velocity of karst water in the fissure first decreased and then increased.The research results could provide guidance for the prevention and control of water inrush in karst tunnels.

Key words:karst tunnel;intermittent fissure;waterinrush;inclination angle of the fissure;three-dimensional discrete element

岩溶隧道断续裂隙掌子面突水过程三维离散元分析_郭佳奇.pdf