Mechanics and Stabilization Analysis on Lining Structure of Chamber Under Disturbed Effects by Excavation in Deep Coal Mine

Based on the on-site monitoring of secondary lining structure in the pump house and connected chamber of deep coal mine, the real-time distributed law of internal force and deformation were obtained. The disturbed effects which were caused by the pumping well chamber, distribution well chamber and water distribution roadway excavation, leading to existing secondary lining structure of pump house were analyzed. The results showed that during the pumping well chamber, distribution well chamber and water distribution roadway were excavating, the straight wall and arch bottom of lining structure were being tensile in vertical. Both of the reinforceme nt hoop stress and concrete hoop strain in the top and arch of structure were increasing rapidly, the average rate of reinforcement hoop stress in top structure was4. 2 ti mes as undisturbed, and the lining structure reaches its ultimate state in top and arch. According to real mechanics analysis of lining structure, surrounding rock and lini ng structure were purposefully reinforced in time, and stability was controlled effectively.