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| Two-phase coupling model based on DEM-SPH and its application in simulation of water inrush disaster in TBM tunnels |
| LIU Cong1，2，LI Liping1，2，ZHOU Zongqing1，2，GAO Chenglu1，2，BAI Songsong2，SUN Jiwei2，LIU Yuhan2 |
| (1. Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China；
2. School of Qilu Transportation，Shandong University，Jinan，Shandong 250002，China) |
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Abstract Water inrush disaster is one of the most common geological disasters in tunnel construction，which is a complex hydro-mechanical coupling process of groundwater and geotechnical media. This study proposed a Discrete Element Method-Smoothed Particle Hydrodynamics(DEM-SPH) coupling method to simulate two-phase flow process of the disaster. Based on the water inrush disaster of 3# TBM tunnel of Yinsong Water Supply Project in Jilin Province，numerical simulations of evolution process of water inrush disaster were carried out through the proposed two-phase coupling method. In simulation，multiphase flow state of solid and fluid media as well as their mass flow rate during the process of water inrush disaster were monitored and analyzed. Finally，the normal impact force on TBM Cutterhead due to water inrush disaster and its torque power was recorded and analyzed. It shows that the normal impact force dramatically increases at sudden of water inrush and then maintain at a relative low level，while the torque power continued to increase as the process of water inrush. These results will provide valuable guidance for the treatment of similar water inrush disasters in TBM tunnels.
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