Simulation Research on Impact Contact Behavior between Coal Gangue Particle and the Hydraulic Support: Contact Response Differences Induced by the Difference in Impacted Location and Impact Material

Abstract

In the process of top coal caving, coal gangue particles may impact on various parts of the hydraulic support. However, at present, the contact mechanism between coal gangue and hydraulic support is not entirely clear. Therefore, this paper first constructed the accurate mathematical model of the hydraulic cylinder equivalent spring stiffness forming by the equivalent series of different parts of emulsion and hydraulic cylinder, and then built the mesh model of the coal gangue particles and the support’s force transmission components; on this basis, the rigid–flexible coupling impact contact dynamic model between coal gangue and hydraulic support was established. After deducing contact parameters and setting impact mode, contact simulations were carried out for coal particles impacting at the different parts of the support and coal/gangue particles impacting at the same component of the support, and the contact response difference in the support induced by the difference in impacted component and coal/gangue properties was compared and studied. The results show that the number of collisions, contact force, velocity and acceleration of impacted part are different when the same single coal particle impact different parts of the support. Various contact responses during gangue impact are more than 40% larger than that of coal, and the difference ratio can even reach 190%.

Energy Dissipation of Hydraulic Support Columns under Rockfall Impact Load in Steeply Dipping Coal Seams

“…The upper and lower ratios of the above parameters are the same, and the upper and lower ratios are 150%. The maximum deformation max δ , maximum impact force max P , column absorption energy W , and energy ratio of the collision process between the hexahedral rockfall and hydraulic support column can be obtained from the numerical simulation [32][33][34][35][36][37].…”

Study on Micromechanical Properties of Gangue Particle Cluster under Uniaxial Compression

“…The crushing characteristics of coal and gangue under impact loading are represented by crushing ratio and crushing probability.Jiang Kao [21] proposed a new mathematical model to calculate the speci c energy increment under different gangue distributions. The gangue distribution function can be used to simulate various situations of gangue distribution in coal seams.Yang Yang [22] established a mesh model of coal gangue particles and support transmission components, and compared the differences in contact response in the support caused by differences in the properties of the impacted components and coal gangue.Li Junmeng [23] used experimental methods to study the particle breakage characteristics and acoustic emission ( AE ) characteristics of CGBM during constant amplitude cyclic loading ( CACL ). At the same time, the relationship between particle breakage and acoustic emission signals was established.…”