Study Of Stability Of Surrounding Rock Of Deep Roadway Based On Particle Flow Code

Abstract:With the rapid development of national economic, human’s demand of mineral resources is increasing, prompting mining gradually to go to deep. Due to the effects of high stress and high dynamic disturbance, surrounding rock of deep roadway is so prone to deform and fracture, which would be Serious threaten for mining’s safety production. Therefore, it plays important theoretical and practical significance to study the stability for the rock surrounding of deep roadwaySetting Dongguashan Copper Mine as engineering background, relying on the project973" the mutagenic mechanism of rock burst and rupture of deep hard rock by blast and excavation " and the project " the research of rock damage mechanism and its control technology under complicated conditions when large-scale high-stress power disturbs in multi-panel、multi-stope", this paper carried out the study of stability of surrounding rock of deep roadway in Dongguashan Copper Mine, through theoretical explanations, site surveys, laboratory experiments and numerical simulation methods. The content and main results are as follows:(1) By geological survey at Donggushan Copper Mine, evaluated scientifically scientifically the structure and quality of surrounding rock in deep roadway, and worked out the rock strength parameters with the method of reduction,which provided scheduling basis for numerical analysis of surrounding rock’s stability for the latter.(2) Relevant mechanical parameters and stress-strain curve of rocks are obtained by physical and mechanical experiments in laboratory. The mechanics parameters of rocks can be used to determine rock strength parameters and reflect mechanical properties of deep roadway’s surrounding rock.(3)By adjusting meso parameters to establish effective and reliable particle flow numerical model, mechanical experiments under uniaxial compressive are simulated, which obtained the mechanism of rock’s micromechanics response and analyzed some parameters’effect of static loading rate, such as volumetric strain, failure modes and so on. (4) The excavation process of roadway at single lithology is simulated. By arranging monitoring points,we can obtained the change of it’s velocity, displacement, stress, etc. In addition, the general laws of each variation’s change in the excavation process of roadway at single lithology can also be figured out.(5) The excavation process of roadway at two different Lithology is simulated,and comparative analysis of two simulation results is conducted. Similarly, we conducted comparative analysis of simualtion results of roadway at single lithology and two different Lithology, and obtained the influence of lithology at stability of deep roadway’s surrounding rock.