Stability analysis of artificial dam in coal mine underground water reservoir based on the hydro-mechanical damage model

Abstract

A numerical hydro-mechanical damage model is proposed in this paper to investigate the stability and failure characteristics of artificial dam in coal mine underground water reservoir. The localized damage model for the coupled pore pressure and rock failure of a stressed rock is developed, and a local damage constitutive law is employed to describe its stress-strain relationship and fracture propagation. The Mohr-Coulomb criterion and maximum tension criterion are used to Judge the damage and failure of rock. Experimental data for rock samples are used to validate the proposed numerical model, and it accurately replicates the stress-strain curves and failure pattern compared with the experimental results. We then explore the influence of water pressures, cutting depth and dam strengths of artificial dam in coal mine underground water reservoir, and the simulation results show that the dam strength is the main factor affecting the strength of artificial dam. The modeling described herein is expected to assist in the management and optimization of underground water reservoirs.