Numerical Simulation Study Of The Fault Slip Induced By Coal Mining In The Feng-feng Mining Area

The ground movement and deformation caused by mining subsidence is vulnerable to the influence of complex geological structures such as fault.Compared with the law of mining subsidence under normal circumstances,mining under fault may change the range of the ground surface settlement and the levels of damage to structures.Consequently,to grasp the laws of mining under fault has important significance for protecting ground buildings and designing schemes of coal mining.This paper takes Feng-Feng mining area as an example to study the combination effects of different factors on mining under fault.After consulting a large number of documents and the analysis of examples,numerical simulation experiments were conducted based on orthogonal design,and the main work and research results of this paper are as follows:(1)The influence of fault on mining subsidence laws was briefly introduced,the examples of mining under fault in Feng-Feng mining area were analyzed,and then the main influence factors of mining under fault were summarized.(2)Numerical simulation method and orthogonal design were introduced,then foundation model of Feng-Feng mining area was established by numerical simulation experiments based on orthogonal design and the rock mechanics parameters of this area were determined.(3)The models of mining under fault were established through using different fault simulation methods,and the comparison results of surface movement curves show that the experimental effect is more obvious when fault zone was established through using weakening method.(4)Divided into four kinds of working conditions,a large number of numerical simulation experiments were conducted based on orthogonal design,and then the significant factors of fault slip caused by mining,the sensitivity of main influence factors and influence rule were analyzed.(5)Based on above-mentioned simulation experiments of mining under fault,taking mining under a certain fault in Feng-Feng mining area as an example,the size of protection pillar when mining in hanging wall and footwall was determined.