Study of Disaster Precursors of Primary Defects within Basement Plate Containing Hidden Fault
In order to investigate the disaster precursor law of complex tectonic activation of the base plate of the hidden fault,and to curb the promotion of the water-conducting channel by the primary fissure of the base plate of the hidden fault,FLAC3D numerical simulation software was used to obtain the identification method of the defective structure during the process of excavation and the disaster precursor law through comparative analysis.The results of the study show that:before the formation of the water-conducting channel,the area of 40 m in length and 30 m in width along the opposite direction of mining is regarded as the abnormal area of shear stress and compressive stress of the primary defective structure;the shear stress in the monitoring points in the anomalous area is constantly increasing,and the shear stress shows a decreasing trend after the face passes through the hidden faults;the compressive stress in the monitoring points in the anomalous area show the trend of"decreasing—increasing".The increasing trend of monitoring points compressive stress can also be used as the information to recognize the primary defect structure.It provides scientific theory and engineering guidance for the safe and green mining of coal resources above high pressurized water and the realization of safe crossing of hidden structures.
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