###### Abstract
[35] used integral transformation technology and pressure derivative to estimate the occurrence time of fault reactivation. [PERSON] et al. [36] studied a fault in the southeast of Missouri. Through surveying and mapping, they showed that the Grace Corner fault zone also has a complex history of polyphase reactivation, involving three Paleozoic reactivation periods of Late Ordovician, Devonian, and Post Mississippi. With the rapid development of computers in the 21 st century, the development of numerical simulation technology is relatively mature, so many scholars have conducted some research on fault activation in the process of deep mining through various numerical simulation software. [PERSON] et al. [37; 38; 39] revealed the fault activation mechanism attributed to successive deep mining through numerical simulation and field monitoring. [PERSON] et al. [40] detected geologic structure stress states such as faults in the Rajendra underground coal mine in India to realize safer mining operations and obtain an understanding of the changes in stress distribution. [PERSON] et al. [41] researched the mechanical mechanism of fault activation through three-dimensional numerical tests and microseismic monitoring. [PERSON] et al. [42] studied the distance between the working face and the maximum displacement of the fault plane when the fault is activated combined with the digital speckle correlation method, discontinuous deformation method, and numerical simulation method. Taking the Barapukuria coal mine in Bangladesh as the research background, [PERSON] et al. [43] employed the boundary element method (BEM) to research the characteristics of stress as well as deformation around the fault and the influence of groundwater on fault activation. [PERSON] and [PERSON] et al. [44; 45] based on the secondary development feature of the finite difference program FLAC 3D, investigated the effects of stress wave, fault surface roughness, and other parameters on fault activation. [PERSON] et al. [46] established a thermal water mechanical damage coupling model (THMED) with faults based on FLAC 3D. Analysis and research of the fault activation barrier effect. [PERSON] et al. [47] used a three-dimensional, fully coupled porous elastic finite element simulation to evaluate the possibility of reactivation of barrier normal fault under normal fault stress state in different production scenarios  
No matter through numerical simulation, indoor experimental research, or theoretical analysis, it is inevitable that some simplifications will be made to the real situation on the spot. Combined with the actual situation of the site, the analysis of fault activation can maximize the reliability of the results. In order to avoid the influence of fault activation on the mining safety of underground mines, [PERSON] and [PERSON] et al. [48; 49] not only established a complete monitoring system for fault activation in the underground, but also analyzed the safety of goat near the fault during longarm mining through practical cases. [PERSON] and [PERSON] et al. [50; 51] studied the possibility of fault reactivation based on the field activities of the Rohr Valley Rift System (RVRS) fault and the normal fault exposed by Kardia lignite mine in the Ptolemy basin, northwest Greece, respectively. To sum up, although predecessors have carried out a great deal of fruitful studies on fault activation patterns and mechanisms under mining influence, however, there are still some deficiencies in the existing research results. First, in the past, there was much research regarding the activation of faults induced by coal extraction, while relatively little research regarding the activation of faults induced by metal mine extraction. As we all know, the deposit of metal and coal have different occurrence states and mining methods, so the fault activation effect and disaster mechanism caused by mining are also different.