Influence of deep magma-induced thermal effects on the regional gas outburst risk of coal seams

Abstract The thermal effect caused by deep magma intrusion can not only accelerate the metamorphism of coal body, but also bring additional field that changes mechanical environment seams, thereby affecting permeability seams. Different from shallow resources, resources are in a characterized limited stress and strain. Thus, has more significant influence on distribution characteristics In this study, evolution history highly metamorphic seams Yangquan mining area was analyzed, main magmatic activity obtained. Based determined vitrinite reflectance data typical mines area, maximum paleotemperature calculated adopting Barker’s method. Furthermore, summarized, its relationship with degree acquired. Then, new model considering strain proposed to analyze at different ground temperatures. Finally, through combination results gas pressure outburst number Sijiazhuang Mine, No. 5 Mine Xinjing temperature risk explored. following conclusions were drawn: be 303 °C. addition, south is higher than north area. various temperatures depths about degrees leading strains. Under fixed displacement boundary conditions deep, seam folds bends varying degrees. Moreover, difference raises value lowers permeability, which promotes formation gas-rich zones increases outburst. research help make proper disaster prevention plan for zones.