摘要: Reliable mine gas prediction is not only essential for effective gas drainage and control，improvement of mining safety and reduction of coal production costs，but also important to mine gas production assessment for gas utilisati... 展开 Reliable mine gas prediction is not only essential for effective gas drainage and control，improvement of mining safety and reduction of coal production costs，but also important to mine gas production assessment for gas utilisation evaluation and planning．An integrated mine gas simulation system has been developed to predict strata conditions and methane gas emission during longwall mining．The system is used to assist selection and planning of suitable mining，gas management and utilisation strategies for new and existing mines．Several key mine gas assessment processes，such as mine site gas and geotechnical characterisation,and fully coupled mechanical deformation-fluid flow computer simulation，have been integrated in the simulation system．Gas flow during mining is controlled by in situ gas content and geotechnical conditions，as well as the mining induced changes in the strata such as those of stress，fracture，pore pressure and permeability.The central part of the integrated simulation system is the new 3D code called COSFLOW that simulates the complex behaviour of rock，water and gas flow，and predicts gas emission during longwall development and retreat．The code is also capable of simulating gas drainage performance and estimating gas production．This system was developed from a recently completed collaborative project entitled “Predevelopment Studies for Mine Methane Management and Utilisation”，between the New Energy and Industrial Technology Development Organization (NEDO) of Japan，the Japan Coal Energy Center (JCOAL)，and the Commonwealth Scientific and Industrial Research Organisation (CSIRO) of Australia．The integrated simulation approach is described in this paper and examples of mine site application are presented． 收起