Investigation of floor rockburst mechanism based on simulation with FLAC3D

WANG Jiayang; SHI Qingwen; GUO Zhengjun; WANG Xiangyu; WANG Xinshuang; HONG Aokun; SUN Jintao

doi:10.19956/j.cnki.ncist.2025.04.003

Abstract：Floor rockburst is a typical dynamic disaster frequently occurring in burst-prone coal mines,with its frequency significantly positively correlated with mining disturbance intensity.To investigate the failure mecha-nism of the roadway floor under the coupled effects of mining vibration and lateral abutment pressure of the roadway,a three-dimensional mechanical model of the floor and two sidewalls was established.The simulation results indicate that when the bending deformation of the floor exceeds a critical threshold,it leads to the loss of stability in the roadway structure,and a corresponding stability criterion was established.Through numerical simulations,the influence of parameters such as the elastic modulus of the floor rock mass,lateral abutment pressure of the roadway,and stress wave intensity on floor stability under the coupled action of dynamic and static loads was systematically studied.The results reveal that the displacement in the sidewall foot area induced by the bending deformation of the floor coal-rock mass exhibits a significant linear correlation with the stability of the roadway sidewalls,and the gradient of displacement changes is proportionally related to the load-bearing capacity of the surrounding rock.The elastic modulus of the floor,lateral abutment pressure,and stress wave intensity are key factors controlling the occurrence of rockbursts:a lower elastic modulus and higher later-al abutment pressure significantly increase the risk of floor rockbursts,while an increase in stress wave intensity accelerates the failure process of the floor.Under dynamic loading,floor damage progresses from shallow to deeper layers in a gradual manner.The conclusions drawn from this study provide theoretical support for mine safety production,optimization of support design,and rockburst prevention,offering important guidance for enhancing mine safety and production efficiency.