Study on stability of the GKQD-2000/1.6/2.4 Transitional Frame Hydraulic Support at the Longwall Junction Using Discontinuous Environment Simulation

Abstract

The paper presents the results of verification and analysis of the operational stability of the GKQD-2000/1.6/2.4 GKQD-2000/1.6/2.4 Transitional Frame Hydraulic Support at the intersection area of the mining roadway, based on discrete element environment simulation (UDEC).The simulation results demonstrate the successful construction of an interaction model between the frame support and the surrounding rock mass in the mining roadway, continuously aligned with the excavation progress. Stress redistribution and rock mass displacement phenomena were realistically reproduced. The coal face and the frame support exhibit stable structural behavior, ensuring safety within the permissible mining limits. Detailed evaluation results indicate that the variation trends of support force and moment on the hydraulic frame are consistent with the evolution of mine pressure and rock mass displacement under normal mining conditions prior to the collapse of the main roof. In the context of limited monitoring of mine pressure in the roadway and restricted experimental space for support operation, the numerical model analysis of frame stability provides initial confirmation of support safety. Moreover, it serves as a foundation for improving frame characteristics to better adapt to extreme roof displacement phenomena in subsequent studies.