In karst regions, tunnel construction often encounters karst water inrush disasters, with particular difficulty in surveying and predicting fractured karst water inrush, posing high risks and lacking efficient numerical research methods to guide safety measures during construction. This study aims to clarify the mechanism of fractured karst water inrush and identify critical conditions. Through theoretical analysis, this paper established partial differential equations for fissure development in karst formations under the influence of karst activation, damage development, and crack propagation. Based on this, a complete numerical simulation method for “fluid-solid-damage” coupling of fractured karst water inrush disasters was established. By analyzing the characteristics of surrounding rock around tunnel sections under the influence of water pressure in different water-enriched cavities, critical conditions for water inrush disasters were obtained. The results indicate that as the water pressure in water-enriched cavities increases, surrounding rock deformation also increases. Additionally, under critical water inrush conditions, the displacement law of surrounding rock exhibits a significant three-stage characteristic of “slow growth stage-rapid growth stage-displacement loss stage”. The research findings provide new insights into the construction risk analysis of karst tunnels in fractured rock areas.
Study on Mechanism and Critical Conditions of Fractured Karst Water Inrush Based on the ‘Fluid-Solid-Damage’ Coupling Model
KSCE J Civ Eng
KSCE Journal of Civil Engineering ; 28 , 12 ; 5909-5918
2024-12-01
10 pages
Article (Journal)
Electronic Resource
English